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  • Editor: Christian Seassal
  • Vol. 21, Iss. S3 — May. 6, 2013
  • pp: A576–A584
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Pre-fractal multilayer structure for polarization- insensitive temporally and spatially coherent thermal emitter

M. C. Larciprete, A. Belardini, R. Li Voti, and C. Sibilia  »View Author Affiliations


Optics Express, Vol. 21, Issue S3, pp. A576-A584 (2013)
http://dx.doi.org/10.1364/OE.21.00A576


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Abstract

We investigate electromagnetic wave propagation through one-dimensional stacks arranged as truncated pre-fractal Cantor multilayer. Taking into account materials’ dispersion as well as real absorptive losses, we studied the spectral and spatial emissivity in both on-axis and off-axis direction. The typical cavity mode resonances associated to the pre-fractal structure are exploited to design a polarization-insensitive infrared emitter pertaining both temporal and spatial coherence.

© 2013 OSA

1. Introduction

Managing material emissivity, or, equivalently, the spectral absorbance of a given object is a crucial issue that can lead to the camouflage of thermal infrared emission. In the seek of coherent thermal source, narrow antenna-like angular emissivity lobes have been shown from a polar material (SiC) surmounted by a periodic 2D-photonic crystal, supporting surface polaritons [1

1. J. J. Greffet, R. Carminati, K. Joulain, J. P. Mulet, S. Mainguy, and Y. Chen, “Coherent emission of light by thermal sources,” Nature 416(6876), 61–64 (2002). [CrossRef] [PubMed]

]. This structure lead to a high degree of spatial coherence for the thermal light, as a result of the surface phonon-polariton diffraction by the grating. However, surface polaritons emission lobe can be observed only when the electric field direction is perpendicular and the magnetic field is parallel to the grooves, respectively, i.e. in TM polarization. As a consequence, the radiation emitted by the source can be confined into a narrow lobe only for TM polarization, while it is isotropically distributed for TE polarization.

Left handed metamaterials composed of periodic metallic structures [2

2. S. Enoch, G. Tayeb, P. Sabouroux, N. Guérin, and P. Vincent, “A metamaterial for directive emission,” Phys. Rev. Lett. 89(21), 213902 (2002). [CrossRef] [PubMed]

,3

3. N. Mattiucci, R. Trimm, G. D'Aguanno, N. Aközbek, and M. J. Bloemer, “Tunable, narrow-band, all-metallic microwave absorber,” Appl. Phys. Lett. 101(14), 141115 (2012). [CrossRef]

] can be exploited to obtain highly directional emission around the surface normal, at those frequencies near plasmon resonance, i.e. when the refractive index of metamaterials approaches zero value however, the restriction to TM waves still holds. The excitation of tunneling modes in a photonic quantum well structure with zero-averaged refractive index (zero-n) coating was shown to enable frequency selective coherent thermal emittance for both TM and TE mode although only theoretically [4

4. B. Tao and L. Fu-Li, “Controlling thermal radiation by photonic quantum well structure with zero-averaged refractive-index gap,” J. Opt. Soc. Am. B 26(1), 96–100 (2009). [CrossRef]

].

The use of one-dimensional layered structures to tailor the spectral properties of thermal radiation in both polarizations relies on completely different principles with respect to periodic gratings and includes several works investigating thin films [5

5. P. Ben-Abdallah, “Thermal antenna behaviour for thin-film structures,” J. Opt. Soc. Am. A 21(7), 1368–1371 (2004). [CrossRef]

,6

6. M. C. Larciprete, A. Albertoni, A. Belardini, G. Leahu, R. Li Voti, F. Mura, C. Sibilia, I. Nefedov, I. V. Anoshkin, E. I. Kauppinen, and A. G. Nasibulin, “Infrared properties of randomly oriented silver nanowires,” J. Appl. Phys. 112(8), 083503 (2012). [CrossRef]

] and –moreover- several types of multilayers [7

7. R. L. Voti, M. C. Larciprete, G. Leahu, C. Sibilia, and M. Bertolotti, “Optimization of thermochromic VO2 based structures with tunable thermal emissivity,” J. Appl. Phys. 112(3), 034305 (2012). [CrossRef]

,8

8. G. D’Aguanno, M. C. Larciprete, N. Mattiucci, A. Belardini, M. J. Bloemer, E. Fazio, O. Buganov, M. Centini, and C. Sibilia, “Experimental study of Bloch vector analysis in nonlinear, finite, dissipative systems,” Phys. Rev. A 81(1), 013834 (2010). [CrossRef]

].

It is well-known that electromagnetic surface waves can be guided by the boundary of a semi-infinite periodic multilayer dielectric medium, thus one-dimensional photonic crystal (PC) can support a surface mode or surface wave for both TM and TE polarizations in the stop band [9

9. P. Yeh, Optical Waves in Layered Media (John Wiley & Sons, 1988).

]. Being surface waves nonradiative, an attenuated total reflection configuration is usually arranged -using a coupling prism- to excite the surface waves at the interface between a PC and air [10

10. W. M. Robertson and M. S. May, “Surface electromagnetic wave excitation on one-dimensional photonic band-gap arrays,” Appl. Phys. Lett. 74(13), 1800–1802 (1999). [CrossRef]

,11

11. E. Descrovi, F. Frascella, M. Ballarini, V. Moi, A. Lamberti, F. Michelotti, F. Giorgis, and C. Fabrizio Pirri, “Surface label-free sensing by means of a fluorescent multilayered photonic structure,” Appl. Phys. Lett. 101(13), 131105 (2012). [CrossRef]

]. Alternatively, a metallic layer can be coated onto a PC and surface waves can be directly excited by propagating waves in air, resulting in a sharp reduction in the reflectance that can be detected without prism or grating configuration even at normal incidence [12

12. J. A. Gaspar-Armenta and F. Villa, “Photonic surface-wave excitation: photonic crystal-metal interface,” J. Opt. Soc. Am. B 20(11), 2349–2354 (2003). [CrossRef]

].

Coherent thermal emission for both TM and TE polarizations has been predicted by exciting surface waves at the interface between a polar material (SiC) and a modified periodic multilayer structure, where the external layers’ thickness are half with respect to inner layers [13

13. B. J. Lee, C. J. Fu, and Z. M. Zhang, “Coherent thermal emission from one-dimensional photonic crystals,” Appl. Phys. Lett. 87(7), 071904 (2005). [CrossRef]

]. Furthermore, the latter structure can greatly enhance the emission by the cavity resonance mode and the Brewster mode [14

14. B. J. Lee and Z. M. Zhang, “Coherent thermal emission from modified periodic multilayer structures,” J. Heat Transfer 129(1), 17–26 (2007). [CrossRef]

]. The wavelength range corresponding to stop bands of the PC should be scaled by changing the thickness of the unit cell, in order to match the phonon absorption band of the SiC, thus surface waves can be excited at the SiC–PC interface within the SiC phonon absorption band for both TM and TE polarizations.

A somewhat different configuration is exploited in the vertical-cavity enhanced resonant thermal emitter (VERTE) [15

15. I. Celanovic, D. Perreault, and J. Kassakian, “Resonant-cavity enhanced thermal emission,” Phys. Rev. B 72(7), 075127 (2005). [CrossRef]

], consisting of a lossless cavity (a SiO2 layer) sandwiched between a partially reflective and lossless PC and a highly reflective metallic mirror. In this configuration the optical cavity resonance, which can be tuned by changing cavity thickness, enhances thermal emission originating from the metallic mirror building up a strong quasimonochromatic field while suppressing nonresonant frequencies.

If the symmetry of the structure is broken by a defect layer, the defect mode associated with the characteristics of the defect layer, i.e. material properties or thickness, can be exploited [16

16. A. Belardini, A. Bosco, G. Leahu, M. Centini, E. Fazio, C. Sibilia, M. Bertolotti, S. Zhukovsky, and S. V. Gaponenko, “Femtosecond pulses chirping compensation by using one-dimensional compact multiple-defect photonic crystals,” Appl. Phys. Lett. 89(3), 031111 (2006). [CrossRef]

]. If an absorbing defect, i.e. a layer of SiC, is embedded into a photonic crystal, it is possible to couple a surface mode with a defect mode as shown in [17

17. P. Ben-Abdallah and B. Ni, “Single-defect Bragg stacks for high-power narrow-band thermal emission,” J. Appl. Phys. 97(10), 104910 (2005). [CrossRef]

]. The presence of a defect generate two localized modes in the reflectance, and consequently in the absorbance curve. Emissivity close to unity can be reached using five periods per mirror for TE polarization (20 microns thick).

Quasi-periodic fractal periodicity can also give rise to interesting spectral features enabling coherent thermal emission. Thermal radiation from quasi-periodic Cantor multilayers containing negative index metamaterials have been theoretically investigated [18

18. M. Maksimović andZ. Jaksic, “Emittance and absorbance tailoring by negative refractive index metamaterial-based Cantor multilayer,” J. Opt. A, Pure Appl. Opt. 8(3), 355–362 (2006). [CrossRef]

]. Phase compensation, i.e. the partial or full compensation of phase shift of an electromagnetic wave propagating through a stack alternating positive and negative index layers, can be a useful tool to get sharp directional emittance spectra.

In this work we investigate the modulation of thermal radiation emissivity obtainable with 1D multilayer structures encompassing all-dielectric layers, whose thickness display quasi-periodic fractal periodicity [19

19. C. Sibilia, P. Masciulli, and M. Bertolotti, “Optical properties of quasiperiodic (self-similar) structures,” Pure Appl. Opt. 7(2), 383–391 (1998). [CrossRef]

,20

20. C. Sibilia, M. Scalora, M. Centini, M. Bertolotti, M. J. Bloemer, and C. M. Bowden, “Electromagnetic properties of periodic and quasi-periodic onedimensional, metallodielectric photonic band gap structures,” J. Opt. A, Pure Appl. Opt. 1(4), 490–494 (1999). [CrossRef]

]. We study the angular emissivity of such structures and show that the appropriate choice of layer thickness and fractal periodicity leads to a quasimonochromatic thermal radiation pertaining a high degree of spatial and temporal coherence. Furthermore, the geometrical dispersion introduced by the fractal periodicity allows to find some wavelengths where both the transverse electric wave and the transverse magnetic undergo a narrow angular and spectral emissivity peak.

2. Thermal radiation from pre-fractal multilayers

Fractal structures differ by the algorithm used for the stack construction. In order to generate a self-similar fractal, a recursive mathematical operation is defined on an object, the so-called initiator [19

19. C. Sibilia, P. Masciulli, and M. Bertolotti, “Optical properties of quasiperiodic (self-similar) structures,” Pure Appl. Opt. 7(2), 383–391 (1998). [CrossRef]

]. Among them, Cantor fractals are largely diffused due to their simplicity and realization easiness. In the case of Cantor fractals the initiator is a straight line of a given initial length, L. A segment of length L/3 is then erased in the middle of the initiator. This operation can be further performed at a reduced scale: a line of L/32 is erased again in the middle of each of the two (remaining) segments. The Cantor fractal is obtained by further iterating this operation, and stopping the iterations at the Nth order, corresponding to the Nth generation, with a scale factor of 3. Theoretically, for a full fractal set the division process should be repeated infinitely long, but for practical reasons a truncation occurs giving a so-called pre-fractal set. If layers exhibit a non-zero imaginary part of the refractive index, a Cantor structure with a very large number of layers would, in fact, lead to intense attenuation and thus it would be useless for practical applications [21

21. A. Lakhtakia, K. E. Weaver, and A. Verma, “Transmission through Cantor filters revisited,” Optik (Stuttg.) 113(11), 510–512 (2002). [CrossRef]

].

A fractal layered structure can be practically realized by filling the empty spaces with a second material, resulting in the alternation of two dielectric layers of different refractive indices, as depicted in the inset of Fig. 1
Fig. 1 (a) Calculated spectral emittance for the third generation of Cantor multilayer structures composed by TiO2 and SiO2 alternating layers. SiO2 was chosen as initiator layer (gray layer in the inset). Dashed line represent the blackbody radiation (calculated at 580K) normalized by its value at Wien’s frequency. Inset: Schematic of proposed fractal layered structure (arranged as triadic Cantor set) for thermal emission control.
. The result is an alternation of two dielectric layers of refractive index n1 and n2 (n1>n2), of such thickness that the optical path of the smallest segments is the same for both materials.

The spectral and directional emission properties of pre-fractal multilayer structures were calculated using the well established numerical technique of the transfer matrix formalism [24

24. J. Lekner, Theory of Reflection (Martinus Nijhoff Pubblisher, 1987).

], assuming the incident light to be a plane wave whose propagation direction forms an angle, θ, with respect to the surface normal. In order to understand the conditions causing large emission in a narrow spectral and angular range, a wavelength/angle map is developed. The effects of geometrical parameters as well as the distribution of the light inside the high- and low-index dielectrics in the pre-fractal structure are investigated.

A layer of a low refractive index material was chosen as the initiator, SiO2 (n1) while TiO2 was chose to fill the empty spaces. For both materials a frequency-dependent complex refractive index was employed [25

25. Subpart 3: Insulators in, Handbook of Optical Constants of Solids II, E. D. Palik ed. (Academic Press, 1985).

]. We studied a third generation Cantor set where the smallest constitutive layers have an equal optical thickness, that of a quarter-wavelength slabs n1d1 = n2d2 = λ0/4, while thicker layers scale consequently, i.e. three and nine quarter- wavelength. The overall structure is less than 18 microns thick or equivalently 27 quarter-wavelength.

The reference wavelength to scale layer thickness was chosen to be λ0 = 5 μm, corresponding to the emission peak of a black body at ~580K. The multilayer is assumed to be deposited on a thick substrate (d >> λ) with an index nS, and surrounded by a semi-infinite medium n0, which in our case for the sake of simplicity is air or vacuum. As a starting point, we chose a SiO2 substrate, while later on we discuss the effect of using different substrates.

In Fig. 1 we show the structure absorbance as a function of wavelength, calculated in the wavelength range 2-14 μm, for the third generation of a Cantor multilayer which is schematically represented in the inset. This particular fractal structure, i.e. the third generation of a Cantor set, is very close to a resonant cavity with embedded defect having a restricted layers’ number and showing some spectral advantages that will be described in the following.

We now focus onto the angular dependence of the sharpest peak of spectral absorbance and plot, in Fig. 2(a)
Fig. 2 (a) Directional spectral emittance calculated at 4.5 μm for the third generation of a pre-fractal multilayer composed by SiO2 and TiO2 in TE polarization (blue curve) TM polarization (red curve) and average polarization (black curve). (b) The corresponding field profile inside the structure for both TE (blue curve) and TM polarization (red curve) calculated for an angle of 34.4°, i.e. where the emissivity maximum occurs.
, the angular emittance calculated at λ = 4.5 μm. The three different colours correspond to TM, TE and average polarization, respectively (see Fig. 2 caption). The emissivity lobes are confined in a very narrow angular region, for both TM and TE polarizations. It’s worth to note that emissivity is here deliberately plotted as a polar plot in order to highlight the narrow angular lobe in a well definite emission angle, occurring for both polarization directions. However, considering the actual geometry of the pre-fractal Cantor multilayer, due to its intrinsic azimuthal symmetry, coherent emission radiate in circular patterns, instead of the antenna shape obtainable with grating surfaces [1

1. J. J. Greffet, R. Carminati, K. Joulain, J. P. Mulet, S. Mainguy, and Y. Chen, “Coherent emission of light by thermal sources,” Nature 416(6876), 61–64 (2002). [CrossRef] [PubMed]

].

Furthermore, in Fig. 2.(b) we plot the corresponding field profile inside the structure calculated at an angle of 34.4°, i.e. where the emissivity maximum overlap between TE and TM polarizations occurs, showing that the electric field distribution is localized into the internal layer.

The angular plots show that the Cantor pre-fractal multilayer structure behaves as a polarized quasimonochromatic thermal source with a spatial coherence length of several wavelengths, resulting from the calculated lobe width at half maximum, Δθ = 43 mrad, thus the spatial coherence length ls of the thermal radiation can be easily retrieved being ls = λ/Δθ ~114 μm. At the same wavelength the corresponding coherence time τc calculated for an incidence angle of θ = 33° is τc = λ2(cΔλ)−1 ~1.5 ps.

We then consider a set of wavelength and incidence angle conditions and show in Fig. 3
Fig. 3 Calculated emissivity as a function of wavelength and incidence angle, for the third generation of a pre-fractal multilayer composed by SiO2 (initiator) and TiO2. (a) TE polarization and (b) TM polarization.
the calculated spectral and directional emissivity in the plane (λ, θ) for both TE, Fig. 3(a), and TM, Fig. 3(b), polarization respectively.

Well defined forbidden band appears in spectral absorbance/emittance of periodic structures, while pre-fractal Cantor multilayers exhibit sharp resonances inside the band even for low generation numbers. As a result, high emissivity peaks due to cavity resonance modes can be found in the wavelength region between 4.2 and 6 μm for both polarizations (see Fig. 1).

Interesting conditions develop when materials and geometrical dispersion allow to find out a wavelength where both the transverse electric and the transverse magnetic waves undergo an emissivity angular peak, as already shown in Fig. 1 for λ = 4.5 μm. By looking at the spectral and directional emissivity curves, one can select other wavelengths where the polar plot of angular emissivity display rather similar TE and TM curves. So far, any time these conditions are fulfilled, the investigated pre-fractal structure may support quasi-coherent thermal emission in a well-defined direction, thus the corresponding operational wavelength, is not only one but span within a certain range, given by the cavity resonance band. In Fig. 4
Fig. 4 Geometrical dispersion of the pre-fractal multilayer structure shown in Fig. 1, in the ω-kx domain: (a) TE polarization and (b) TM polarization.
the geometrical dispersion of the pre-fractal multilayer structure is shown in the ω-kx domain, for both TE and TM polarization, being kx the parallel component of the wave vector, i.e. kx=ksin(θ). Choosing a different λ0 for multilayer design has the effect to shift the cavity resonance modes, and thus the emissivity peak wavelengths consequently.

Owing to the low generation number of the pre-fractal multilayer, these cavity resonance modes are similar to those appearing in photonic crystals having a defect layer inside, i.e. so called defect-modes. In other words, the investigated pre-fractal multilayer is similar to a defect layer sandwiched between two mirrors-like stacks. For example, a Brag stack that has the internal layer replaced by a different material can support a defect-mode. Consequently, the resonant electromagnetic wave is confined inside the internal layer at the stop band due to high reflection from boundaries, resulting in a large absorption peak at the resonance condition if the constitutive layers, as well as the substrate, are absorbing media.

For comparison, in Fig. 5
Fig. 5 Geometrical dispersion of a cavity with a defect composed by TiO2 defect layer sandwiched between two SiO2 and TiO2 mirrors, resulting in a total optical thickness of 27 quarter-wavelength, in the ω-kx domain: (a) TE polarization and (b) TM polarization.
we plot the corresponding geometrical dispersion for a cavity with defect (single-defect Bragg stack) composed of SiO2 and TiO2 mirrors and a TiO2 defect layer, having the same total optical thickness of the pre-fractal multilayer, i.e. 27 quarter-wavelength. The same angular and wavelength step was employed as well as the same substrate.

Some similarities are immediately clear, since the defect layer determines two narrow cavity modes in band structure, thus this optimized cavity can support a similar behaviour as observed in pre-fractal multilayer. By plotting the directional spectral emittance, in Fig. 6(a)
Fig. 6 (a) Directional spectral emittance calculated at 4.5 μm for the defect cavity of Fig. 5 in TE polarization (blue curve), TM polarization (red curve) and average polarization (black curve). (b) The corresponding field profile inside the structure for both TE (blue curve) and TM polarization (red curve) calculated for an incidence angle of 32.4°.
, it is possible to observe that the maximum emittance value is lower in the defect cavity, with respect to the pre-fractal structure, and the undesired emittance at high angles, i.e. between 80°and 90°, is rather significant. On the other hand, the plot of the field profile inside the different layers of the structure, Fig. 6(b), show that the electric filed distribution is similar to the investigated low generation pre-fractal structure, reaching a somewhat higher value due to decreased resonance width.

An advantage of the pre-fractal multilayer over the defect cavity is that the high frequency resonance mode, for TE and TM display a larger capability for spectral and angular overlap, resulting in a wider wavelength range of polarization insensitive quasi-coherent thermal emission in a well-defined direction.

At the same time, we also investigated the complementary pre-fractal Cantor multilayer, where the high refractive index TiO2 plays the initiator role and the low refractive index material is SiO2. In this configuration we find that, beside a slight increase of the total physical thickness to 22 μm, the cavity resonance modes for both TE and TM polarization partially overlap thus it is not possible to find a wavelength with a single and well defined angular peak.

It is also interesting to investigate how the spectral emissivity develops if pre-fractal is further developed. In Fig. 7
Fig. 7 Calculated spectral emittance for the three consecutive generations of Cantor multilayer structures composed by TiO2 and SiO2 (initiator) alternating layers.
we show the spectral emissivity calculated for the fourth and the fifth pre-fractal generation, respectively. The corresponding curve for the third pre-fractal generation is also included for comparison. The spectral resonances survive, although significantly broadened. As a consequence of this broadening, the directionality of angular emissivity is reduced as well as the electric field profile calculated at both wavelength and angular peak.

As a final remark, we wish to address the effect of the substrate on the absolute emissivity peak value. As a matter of fact, the highest is substrate absorbance at a certain wavelength, the highest is the corresponding emissivity peak. We therefore investigated different types of substrate going from IR-absorbing (SiO2, SiC and Ag) to IR-transparent (CaF2 or air) ones. In Fig. 8
Fig. 8 Angular emissivity for the pre-fractal multilayer of Fig. 1, calculated at 5 μm for TE polarization and for several different substrates (see arrows).
we show that while the emissivity peak at λ = 5μm is close to unity for SiO2 substrate (see Fig. 1), its value decreases as the substrate reflectivity (for SiC and Ag) or transparency (for CaF2 and air) is increased. Given the substrate dispersion law, other regime can be exploited, as for instance the excitation of surface waves [14

14. B. J. Lee and Z. M. Zhang, “Coherent thermal emission from modified periodic multilayer structures,” J. Heat Transfer 129(1), 17–26 (2007). [CrossRef]

]. Depending on the chose operational wavelength is thus possible to choose the most appropriate substrate.

3. Conclusions

We investigated one-dimensional pre-fractal Cantor multilayer structures supporting quasi-coherent thermal emission at selected infrared wavelengths and in a well-defined direction, due to the excitation of cavity resonance mode. Using two ordinary optical materials as SiO2 and TiO2 and for a total physical thickness as small as 18 μm, we find that it is possible to obtain a polarization-insensitive quasimonochromatic infrared source having both spectral and angular narrow divergence. Choosing a reference wavelength λ0 = 5μm for scaling multilayer design, a spatial coherence length as high as ls~25·λ is predicted at λ = 4.5 μm, together with a coherence time of τc ~1.5 ps. A change in λ0 would in turn shift the cavity resonance modes, and thus the emissivity peak wavelengths would scale consequently. Tailoring and handling thermal radiation is a compulsory feature for a wide variety of applications ranging from infrared camouflage to selective and coherent thermal emission.

Acknowledgments

This work has been performed in the framework of the “FISEDA” project, granted by Italian Ministry of Defence. N. Mattiucci and G. D’Aguanno are kindly acknowledged for interesting discussions and comments.

References and links

1.

J. J. Greffet, R. Carminati, K. Joulain, J. P. Mulet, S. Mainguy, and Y. Chen, “Coherent emission of light by thermal sources,” Nature 416(6876), 61–64 (2002). [CrossRef] [PubMed]

2.

S. Enoch, G. Tayeb, P. Sabouroux, N. Guérin, and P. Vincent, “A metamaterial for directive emission,” Phys. Rev. Lett. 89(21), 213902 (2002). [CrossRef] [PubMed]

3.

N. Mattiucci, R. Trimm, G. D'Aguanno, N. Aközbek, and M. J. Bloemer, “Tunable, narrow-band, all-metallic microwave absorber,” Appl. Phys. Lett. 101(14), 141115 (2012). [CrossRef]

4.

B. Tao and L. Fu-Li, “Controlling thermal radiation by photonic quantum well structure with zero-averaged refractive-index gap,” J. Opt. Soc. Am. B 26(1), 96–100 (2009). [CrossRef]

5.

P. Ben-Abdallah, “Thermal antenna behaviour for thin-film structures,” J. Opt. Soc. Am. A 21(7), 1368–1371 (2004). [CrossRef]

6.

M. C. Larciprete, A. Albertoni, A. Belardini, G. Leahu, R. Li Voti, F. Mura, C. Sibilia, I. Nefedov, I. V. Anoshkin, E. I. Kauppinen, and A. G. Nasibulin, “Infrared properties of randomly oriented silver nanowires,” J. Appl. Phys. 112(8), 083503 (2012). [CrossRef]

7.

R. L. Voti, M. C. Larciprete, G. Leahu, C. Sibilia, and M. Bertolotti, “Optimization of thermochromic VO2 based structures with tunable thermal emissivity,” J. Appl. Phys. 112(3), 034305 (2012). [CrossRef]

8.

G. D’Aguanno, M. C. Larciprete, N. Mattiucci, A. Belardini, M. J. Bloemer, E. Fazio, O. Buganov, M. Centini, and C. Sibilia, “Experimental study of Bloch vector analysis in nonlinear, finite, dissipative systems,” Phys. Rev. A 81(1), 013834 (2010). [CrossRef]

9.

P. Yeh, Optical Waves in Layered Media (John Wiley & Sons, 1988).

10.

W. M. Robertson and M. S. May, “Surface electromagnetic wave excitation on one-dimensional photonic band-gap arrays,” Appl. Phys. Lett. 74(13), 1800–1802 (1999). [CrossRef]

11.

E. Descrovi, F. Frascella, M. Ballarini, V. Moi, A. Lamberti, F. Michelotti, F. Giorgis, and C. Fabrizio Pirri, “Surface label-free sensing by means of a fluorescent multilayered photonic structure,” Appl. Phys. Lett. 101(13), 131105 (2012). [CrossRef]

12.

J. A. Gaspar-Armenta and F. Villa, “Photonic surface-wave excitation: photonic crystal-metal interface,” J. Opt. Soc. Am. B 20(11), 2349–2354 (2003). [CrossRef]

13.

B. J. Lee, C. J. Fu, and Z. M. Zhang, “Coherent thermal emission from one-dimensional photonic crystals,” Appl. Phys. Lett. 87(7), 071904 (2005). [CrossRef]

14.

B. J. Lee and Z. M. Zhang, “Coherent thermal emission from modified periodic multilayer structures,” J. Heat Transfer 129(1), 17–26 (2007). [CrossRef]

15.

I. Celanovic, D. Perreault, and J. Kassakian, “Resonant-cavity enhanced thermal emission,” Phys. Rev. B 72(7), 075127 (2005). [CrossRef]

16.

A. Belardini, A. Bosco, G. Leahu, M. Centini, E. Fazio, C. Sibilia, M. Bertolotti, S. Zhukovsky, and S. V. Gaponenko, “Femtosecond pulses chirping compensation by using one-dimensional compact multiple-defect photonic crystals,” Appl. Phys. Lett. 89(3), 031111 (2006). [CrossRef]

17.

P. Ben-Abdallah and B. Ni, “Single-defect Bragg stacks for high-power narrow-band thermal emission,” J. Appl. Phys. 97(10), 104910 (2005). [CrossRef]

18.

M. Maksimović andZ. Jaksic, “Emittance and absorbance tailoring by negative refractive index metamaterial-based Cantor multilayer,” J. Opt. A, Pure Appl. Opt. 8(3), 355–362 (2006). [CrossRef]

19.

C. Sibilia, P. Masciulli, and M. Bertolotti, “Optical properties of quasiperiodic (self-similar) structures,” Pure Appl. Opt. 7(2), 383–391 (1998). [CrossRef]

20.

C. Sibilia, M. Scalora, M. Centini, M. Bertolotti, M. J. Bloemer, and C. M. Bowden, “Electromagnetic properties of periodic and quasi-periodic onedimensional, metallodielectric photonic band gap structures,” J. Opt. A, Pure Appl. Opt. 1(4), 490–494 (1999). [CrossRef]

21.

A. Lakhtakia, K. E. Weaver, and A. Verma, “Transmission through Cantor filters revisited,” Optik (Stuttg.) 113(11), 510–512 (2002). [CrossRef]

22.

A. V. Lavrinenko, S. V. Zhukovsky, K. S. Sandomirski, and S. V. Gaponenko, “Propagation of classical waves in nonperiodic media: scaling properties of an optical Cantor filter,” Phys. Rev. E Stat. Nonlin. Soft Matter Phys. 65(33 Pt 2B), 036621 (2002). [CrossRef] [PubMed]

23.

X. Sun and D. L. Jaggard, “Wave interaction with generalized Cantor bar fractal multilayers,” J. Appl. Phys. 70(5), 2500–2507 (1991). [CrossRef]

24.

J. Lekner, Theory of Reflection (Martinus Nijhoff Pubblisher, 1987).

25.

Subpart 3: Insulators in, Handbook of Optical Constants of Solids II, E. D. Palik ed. (Academic Press, 1985).

OCIS Codes
(030.5620) Coherence and statistical optics : Radiative transfer
(260.3060) Physical optics : Infrared
(350.5610) Other areas of optics : Radiation

ToC Category:
Radiative Transfer

History
Original Manuscript: October 23, 2012
Revised Manuscript: December 3, 2012
Manuscript Accepted: December 4, 2012
Published: May 6, 2013

Citation
M. C. Larciprete, A. Belardini, R. Li Voti, and C. Sibilia, "Pre-fractal multilayer structure for polarization- insensitive temporally and spatially coherent thermal emitter," Opt. Express 21, A576-A584 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-S3-A576


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