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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 27 — Dec. 17, 2012
  • pp: 28017–28024
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A perfect absorber made of a graphene micro-ribbon metamaterial

Rasoul Alaee, Mohamed Farhat, Carsten Rockstuhl, and Falk Lederer  »View Author Affiliations


Optics Express, Vol. 20, Issue 27, pp. 28017-28024 (2012)
http://dx.doi.org/10.1364/OE.20.028017


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Abstract

Metamaterial-based perfect absorbers promise many applications. Perfect absorption is characterized by the complete suppression of transmission and reflection and complete dissipation of the incident energy by the absorptive meta-atoms. A certain absorption spectrum is usually assigned to a bulk medium and serves as a signature of the respective material. Here we show how to use graphene flakes as building blocks for perfect absorbers. Then, an absorbing meta-atom only consists of a molecular monolayer placed at an appropriate distance from a metallic ground plate. We show that the functionality of such device is intuitively and correctly explained by a Fabry-Perot model.

© 2012 OSA

1. Introduction

Graphene is a two-dimensional (2D) carbon material with tremendous applications. In 1962 it was isolated by Boehm et al. for the first time [1

1. H. P. Boehm, A. Clauss, G. O. Fischer, and U. Hofmann, “Dünnste kohlenstoff-folien,” Z. Naturforschg. 17, 150–157 (1962).

]. More recently, in 2004, a team led by Geim proposed a more efficient way to produce it based on exfoliation procedures. That moment was the starting point for the rise of graphene [2

2. K. S. Novoselov, A. K. Geim, S. V. Morozov, D. Jiang, Y. Zhang, S. V. Dubonos, I. V. Grigorieva, and A. A. Firsov, “Electric field effect in atomically thin carbon films,” Science 306, 666–669 (2004). [CrossRef] [PubMed]

]. The research was fueled by the extraordinary electronic transport properties of graphene which differ substantially from those in metals and semiconductors [3

3. A. H. Castro Neto, F. Guinea, N. M. R. Peres, K. S. Novoselov, and A. K. Geim, “The electronic properties of graphene,” Rev. Mod. Phys. 81, 109–162 (2009). [CrossRef]

]. In fact, electrons behave like massless particles when they propagate in graphene sheets, like photons do in matter with the notable difference that they have an electric charge. These unprecedented electronic properties make graphene a serious candidate for the material of the 21st century [4

4. S. Stankovich, D. A. Dikin, G. H. B. Dommett, K. M. Kohlhaas, E. J. Zimney, E. A. Stach, R. D. Piner, S. T. Nguyen, and R. S. Ruoff, “Graphene-based composite materials,” Nature 442, 282–286 (2006). [CrossRef] [PubMed]

,5

5. C. Berger, Z. Song, X. Li, X. Wu, N. Brown, C. Naud, D. Mayou, T. Li, J. Hass, A. N. Marchenkov, E. H. Conrad, P. N. First, and W. A. de Heer, “Electronic confinement and coherence in patterned epitaxial graphene,” Science 312, 1191–1196 (2006). [CrossRef] [PubMed]

] to be used for ultrafast, low loss electronic devices because of its high conductivity and its extraordinary mechanical parameters.

Likewise the optical properties of graphene attracted a great deal of research interest. In the visible, graphene acts as an absorptive dielectric. The absorption A of a single sheet amounts to Aπα ≈ 2.3% [3

3. A. H. Castro Neto, F. Guinea, N. M. R. Peres, K. S. Novoselov, and A. K. Geim, “The electronic properties of graphene,” Rev. Mod. Phys. 81, 109–162 (2009). [CrossRef]

, 6

6. R. R. Nair, P. Blake, A. N. Grigorenko, K. S. Novoselov, T. J. Booth, T. Stauber, N. M. R. Peres, and A. K. Geim, “Fine structure constant defines visual transparency of graphene,” Science 320, 1308 (2008). [CrossRef] [PubMed]

], with α = e2/h̄c ≈ 1/137 being the fine structure constant. Various applications, ranging from graphene based optical modulators [7

7. M. Liu, X. Yin, E. Ulin-Avila, B. Geng, T. Zentgraf, L. Ju, F. Wang, and X. Zhang, “A graphene-based broadband optical modulator,” Nature 474, 64–67 (2011). [CrossRef] [PubMed]

], transformation optics [8

8. A. Vakil and N. Engheta, “Transformation optics using graphene,” Science 332, 1291–1294 (2011). [CrossRef] [PubMed]

] to numerous other devices [9

9. P.-Y. Chen and A. Alù, “Atomically-thin surface cloak using graphene monolayers,” ACS Nano 5, 5855–5863 (2011). [CrossRef] [PubMed]

11

11. A. Manjavacas, P. Nordlander, and F. J. G. de Abajo, “Plasmon blockade in nanostructured graphene,” ACS Nano 6, 1724–1731 (2012). [CrossRef] [PubMed]

] may be envisaged by using graphene in the optical domain. Examples have been already experimentally demonstrated and have been provided solid evidence for the versatility of graphene [12

12. L. Ju, B. Geng, J. Horng, C. Girit, M. Martin, Z. Hao, H. A. Bechtel, X. Liang, A. Zettl, Y. R. Shen, and F. Wang, “Graphene plasmonics for tunable terahertz metamaterials,” Nat. Nanotechnology 6, 630–634 (2011). [CrossRef]

14

14. J. Chen, M. Badioli, P. Alonso-Gonzlez, S. Thongrattanasiri, F. Huth, J. Osmond, M. Spasenovic, A. Centeno, A. Pesquera, P. Godignon, A. Z. Elorza, N. Camara, F. J. G. de Abajo, R. Hillenbrand, and F. H. L. Koppens, “Optical nano-imaging of gate-tunable graphene plasmons,” Nature 487, 77–81 (2012). [PubMed]

].

At lower frequencies, the optical properties of graphene resemble those of a Drude-type material. Such materials promote the formation of surface plasmon polaritons (SPP). An SPP is a collective oscillation of the charge density and light at the interface between a graphene sheet and its surrounding [13

13. Z. Fei, A. S. Rodin, G. O. Andreev, W. Bao, A. S. McLeod, M. Wagner, L. M. Zhang, Z. Zhao, M. Thiemens, G. Dominguez, M. M. Fogler, A. H. Castro Neto, C. N. Lau, F. Keilmann, and D. N. Basov, “Gate-tuning of graphene plasmons revealed by infrared nano-imaging,” Nature 487, 82–85 (2012). [PubMed]

18

18. A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal, and L. Martin-Moreno, “Fields radiated by a nanoemitter in a graphene sheet,” Phys. Rev. B 84, 195446 (2011).

]. An SPP supported at a graphene interface can be guided in many ways like other types of waves (light or sound). This property attracted a particular interest of the metamaterial and plasmonic community [19

19. P. Tassin, T. Koschny, M. Kafesaki, and C. M. Soukoulis, “A comparison of graphene, superconductors and metals as conductors for metamaterials and plasmonics,” Nature Photonics 6, 259–264 (2011). [CrossRef]

, 20

20. F. H. L. Koppens, D. E. Chang, and F. J. G. de Abajo, “Graphene plasmonics: a platform for strong light-matter interactions,” Nano Lett. 11, 3370–3377 (2011). [CrossRef] [PubMed]

].

One of the most interesting properties of plasmonic metamaterials is the perfect absorption of light [21

21. N. I. Landy, S. Sajuyigbe, J. J. Mock, D. R. Smith, and W. J. Padilla, “Perfect metamaterial absorber,” Phys. Rev. Lett. 100, 207402 (2008). [CrossRef] [PubMed]

, 22

22. C. M. Watts, X. Liu, and W. J. Padilla, “Metamaterial electromagnetic wave absorbers,” Adv. Mater. 24, OP98–OP120, (2012). [CrossRef] [PubMed]

]. Such functionality was demonstrated while relying on different designs and while optimizing the point of operation over large frequency ranges [23

23. T. V. Teperik, F. J. G. de Abajo, A. G. Borisov, M. Abdelsalam, P. N. Bartlett, Y. Sugawara, and J. J. Baumberg, “Omnidirectional absorption in nanostructured metal surfaces,” Nat. Photonics 2, 299–301 (2008). [CrossRef]

29

29. C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B 84, 075102 (2011). [CrossRef]

]. The functionality of such perfect absorbers can be understood in the framework of the more general theory of coherent perfect absorption (CPA). It is in many ways the time-reversed analogue of the lasing effect. Instead of radiating a coherent flux of light in a very narrow spectral band [30

30. Y. D. Chong, Li Ge, Hui Cao, and A. D. Stone, “Coherent perfect absorbers: time-reversed lasers,” Phys. Rev. Lett. 105, 053901 (2010). [CrossRef] [PubMed]

, 31

31. W. Wan, Y. Chong, L. Ge, H. Noh, A. D. Stone, and H. Cao, “Time-reversed lasing and interferometric control of absorption,” Science 331, 889–892 (2011). [CrossRef] [PubMed]

], CPA can occur for structures possessing intrinsic losses. It only requires that an incoming radiation pattern is dissipated by suppressing the associated reflection and transmission channels. In fact, the CPA effect can only occur because of the interplay of interference and absorption being achievable just for a very specific geometry and frequency range. More recently, graphene nanodisks were suggested for this purpose [32

32. S. Thongrattanasiri, F. H. L. Koppens, and F. J. G. de Abajo, “Complete optical absorption in periodically patterned graphene,” Phys. Rev. Lett. 108, 047401 (2012). [CrossRef] [PubMed]

]. It was shown that graphene flakes allow for the perfect absorption of THz radiation owing to their high extinction cross section (compared to their geometrical cross section). Such perfect absorption has also been achieved when the discs were put in front of a mirror at some distance.

Recently graphene micro-ribbons is theoretically and experimentally studied [12

12. L. Ju, B. Geng, J. Horng, C. Girit, M. Martin, Z. Hao, H. A. Bechtel, X. Liang, A. Zettl, Y. R. Shen, and F. Wang, “Graphene plasmonics for tunable terahertz metamaterials,” Nat. Nanotechnology 6, 630–634 (2011). [CrossRef]

, 33

33. A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal, and L. Martin-Moreno, “Surface plasmon enhanced absorption and suppressed transmission in periodic arrays of graphene ribbons,” Phys. Rev. B 85, 081405(R) (2012). [CrossRef]

]. In this paper we propose to take advantage of the recent technological progress in fabricating nanostructured graphene layers grown on dielectric substrates [12

12. L. Ju, B. Geng, J. Horng, C. Girit, M. Martin, Z. Hao, H. A. Bechtel, X. Liang, A. Zettl, Y. R. Shen, and F. Wang, “Graphene plasmonics for tunable terahertz metamaterials,” Nat. Nanotechnology 6, 630–634 (2011). [CrossRef]

]. We show that perfect absorption can be achieved by patterned graphene micro-ribbons on a thick dielectric layer deposited on top of a reflecting metal substrate. Furthermore, we show that the complete light absorption is almost independent of angle of incidence and its frequency can be easily tuned by changing the chemical potential or gate voltage.

The modus operandi of the suggested perfect absorber differs from that of the ordinary ones made of metallic nanoparticles brought in close proximity to a metallic ground plate. There, the current induced in the ground plate via a near-field interaction is out-of-phase to the current in the nanoparticle. This causes the resonance to be dark and radiative losses to be reduced. If the condition of critical coupling is achieved, the incident light can be fully absorbed [34

34. C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B 84, 075102 (2011). [CrossRef]

]. In striking contrast, the device we suggest and study here is characterized by a thick dielectric intermediate layer that prohibits any near-field interaction between the nanostructured graphene and the ground plate. This type of perfect absorber is known as the Salisbury screen or absorber [35

35. W. W. Salisbury, “Absorbent body for electromagnetic waves,” US Patent 2599944 (1952).

]. Instead, perfect absorption is achieved by exploiting a perfect destructive interference of the reflected light [22

22. C. M. Watts, X. Liu, and W. J. Padilla, “Metamaterial electromagnetic wave absorbers,” Adv. Mater. 24, OP98–OP120, (2012). [CrossRef] [PubMed]

, 35

35. W. W. Salisbury, “Absorbent body for electromagnetic waves,” US Patent 2599944 (1952).

37

37. L. Huang, D. R. Chowdhury, S. Ramani, M. T. Reiten, S.-N. Luo, A. K. Azad, A. J. Taylor, and H. T. Chen, “Impact of resonator geometry and its coupling with ground plane on ultrathin metamaterial perfect absorbers,” Appl. Phys. Lett. 101, 101102 (2012). [CrossRef]

]. Transmission through the structure is totally suppressed because the thickness of the ground plate is much larger than the typical skin depth at THz frequency. Therefore, the complete electromagnetic energy gets absorbed by the graphene micro-ribbons. We explain our findings by considering the micro-ribbons as a metasurface. This allowed us to describe them only by their reflection and transmission coefficients and using Airy formula for an asymmetric Fabry Perot cavity to calculate the absorption in the device [38

38. P. Yeh, Optical Waves in Layered Media (Wiley, New York, 2005).

]. Predictions from such simple model are in excellent agreement with full-wave simulations and clearly prove that the perfect absorption is a purely coherent effect.

2. Graphene perfect absorber

The structure under consideration is shown in Fig. 1. It consists of a graphene micro-ribbon array on top of a metallic ground plate separated by a thick dielectric spacer. It is periodic in one direction (y) with periodicity P = 2μm and infinitely extended in the other one. We assume the refractive index ( n=εd=2.1) of the dielectric deposited on the metal. The ground plate is made of gold with a conductivity σ = 4×107S/m which is perfectly reflecting in the frequency domain of interest (Far-infrared regime).

Fig. 1 Schematic of the graphene micro-ribbon perfect absorber. The geometrical parameters of the proposed structure are: tF = 1 μm, d = 1 – 100 μm, WGR = 1 μm and P = 2 μm. The inset shows the honeycomb microscopic structure of the graphene layer arranged as micro-ribbons.

Fig. 2 (a) Real and (b) imaginary parts of the relative permittivity of a 1nm thick graphene sheet as function of frequency as well as chemical potential. (c) Absorption as a function of frequency (ω) and dielectric thickness (d) for a graphene micro-ribbon perfect absorber with chemical potential μc = 100meV at normal incidence. (d) Absorption as a function of frequency and chemical potential for graphene micro-ribbons perfect absorber with d = 4.7 μm at normal incidence. (e) and (f) show the absorption as a function of the angle of incidence with dielectric thickness d = 4.7 μm and d = 4.9 μm for the first and second mode, respectively. The insets show the electric field distribution Ey for both modes as well.

Figure 2(c) shows the absorption A of the graphene micro-ribbons (of Fig. 1) as function of the thickness of the spacer d and the frequency of operation. The strong coupling of the Fabry-Perot resonance with the localized eigenmode of the graphene micro-ribbons is clearly visible in Fig. 2(c) and this leads to an avoided crossing and a significant Rabbi splitting. The results reveal that perfect absorption (A = 1) can be achieved at various values of d, periodically spaced between 1 and 100 μm around a frequency of 3.6 THz for the first mode (dipolar one) and around 7.3 THz for the second mode, where the peaks are less pronounced (A < 1). However, by optimizing the geometry and tuning the chemical potential, we have verified that it is possible to achieve total absorption for both modes (this is not included in this contribution). Moreover, the resonance frequency of maximum absorption is slightly changing for different dielectric spacer and this effect is more pronounced for the first mode (see Fig. 2(c)). In Fig. 2(d) the absorption as a function of the chemical potential μc (ranging from 50 to 200 meV) and the frequency is displayed. It can be clearly seen that the resonance frequency of the absorber can be tuned over a wide range by varying μc. It should be mentioned that by applying a gate voltage (a static electric field) or by means of chemical doping, the chemical potential and thus the conductivity of graphene can be controlled on purpose.

In order to investigate the robustness of the graphene perfect absorber, the absorption as a function of frequency and the angle of incidence is displayed in Fig. 2(e) and 2(f). The first mode is almost unaffected while varying the angle of incidence θ until 80 degrees [Fig. 2(e)]. Then absorption starts to decrease. The behavior of the higher order mode (the second mode for instance) is quite different, as shown in Fig. 2(f), where the absorption is strongly dependent on the angle of incidence and significantly decreases beyond 50 degrees to vanish completely at about 80 degrees. The electric field distribution Ey (component parallel to the gap) at plasmon resonance is displayed for both modes in the insets of Fig. 2(e) and 2(f), respectively, and confirms the nature of the excited modes [dipole and higher order].

3. Mechanism of complete absorption

Let us focus now on the underlying mechanism of perfect absorption for graphene. To simplify the structure and to provide a physical explanation, we shall consider the structure as an asymmetric Fabry-Perot cavity with two mirrors, i.e., a graphene micro-ribbon array as the top mirror and the metallic ground plate as the bottom mirror. The transmission channel (T) of the system is completely suppressed by choosing a sufficiently thick ground plate (T ≃ 0). In order to achieve total absorption of the incident energy (A = 1 − TR ≃ 1) the reflection channel must be closed as well (R = |r|2 = |r12 + rm|2 ≃ 0) which is the sum of the direct reflection coefficient r12 and the multiple reflection coefficient rm [as sketched in Fig. 3(e)]. The total reflection coefficient can be expressed as [38

38. P. Yeh, Optical Waves in Layered Media (Wiley, New York, 2005).

]:
r=r12+rm=r12+t12t21r23e(2iφ)1r21r23e(2iφ),
(2)
where, t12, t21, r12, r21, r23 are complex-valued transmission and reflection coefficients at both interfaces, φ = k0nd cosθ′ is the phase accumulated upon a cavity transfer, k0 is the free space wavenumber, n is the refractive index of the dielectric, and d is its thickness. The dependence of the absorption maxima on the dielectric spacer thickness d calculated by using the Airy formula (Eq. (2)) is shown in Fig. 3 for the first (a) and the second (b) modes. This formula could be used by considering the graphene micro-ribbons as a metasurface (this could be justified by its extremely small thickness compared to other dimensions and to the wavelength), and it is completely defined by its reflection and transmission coefficients. These coefficients were calculated using FMM while assuming that the sufficient thin graphene metasurface is sandwiched between two semi-infinite half-spaces; one of them being air; the other being the dielectric. Assuming an excitation with a linearly polarized incident plane wave either from the top medium (air) or from the bottom medium (dielectric), provides unambiguously the coefficients r12, t12, r21, and t21, respectively.

Fig. 3 (a) and (b) show maximum absorption as a function of dielectric thickness and frequency calculated from semi-analytical approach (Airy formula) and full wave simulation (FMM) for the first and second mode, respectively. (c) and (d) show real and imaginary parts of direct reflection coefficient (r12) as well as multiple reflection coefficient (rm) with dielectric thickness d = 4.7 μm and d = 4.9 μm for the first and the second mode respectively. The red arrows represent the crossing point when real or imaginary parts of reflection coefficients has same magnitude with opposite sign (r12 = −rm).(e) Schematic of the asymmetric Fabry-Perot cavity with the definition of the multiple reflection and transmission coefficients involved and an indication on the contribution of the directly reflected light and the reflected light due to multiple scattering inside the Fabry-Perot cavity..

For comparison, the rigorous calculations (using FMM) are also displayed in the same figure, and a perfect agreement between the two methods is evident for both modes [see Fig. 3(a) and 3(b)]. In addition, the real and imaginary parts of the multiple reflection coefficient rm and the direct reflection coefficient r12 are plotted in Fig. 3(c) and 3(d) again for both modes. Let us concentrate for a while on the first mode [Fig. 3(c)]; at the resonance frequency f = 3.6 THz, and for a spacer thickness d = 4.7μm, both coefficients rm and r12 have the same phase and opposite amplitude. Hence, the resulting total reflection coefficient is completely canceled due to destructive interference (r12 = −rm). As a result, the absorption is almost unity for this frequency. However, we expect for the second mode, resonant at f = 7.3 THz that the multiple reflection coefficient can not totally eliminate the direct reflection coefficient at d = 4.9μm because the absorption is less than unity, [see Fig. 3(d)]. But as mentioned earlier, this issue could be fixed by optimizing the structure which is beyond the scope of this paper.

4. Conclusion

To conclude, in this contribution we have discussed a new class of perfect absorbers in the Far-infrared regime based on graphene micro-ribbons. Our structure showed complete absorption for the first mode and for different geometrical configurations. The robustness of the mechanism was evidenced by analyzing its dependence on the angle of incidence and the chemical potential of the graphene sheets. Moreover, we utilized a semi-analytical approach based on a Fabry-Perot model that explains very well the observed behavior. We believe that our study demonstrates the versatility of graphene and could be used in future for optical or THz interconnects.

Acknowledgments

This work was partially supported by the German Federal Ministry of Education and Research (Metamat and PhoNa) and by the Thuringian State Government (MeMa).

References and links

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2.

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3.

A. H. Castro Neto, F. Guinea, N. M. R. Peres, K. S. Novoselov, and A. K. Geim, “The electronic properties of graphene,” Rev. Mod. Phys. 81, 109–162 (2009). [CrossRef]

4.

S. Stankovich, D. A. Dikin, G. H. B. Dommett, K. M. Kohlhaas, E. J. Zimney, E. A. Stach, R. D. Piner, S. T. Nguyen, and R. S. Ruoff, “Graphene-based composite materials,” Nature 442, 282–286 (2006). [CrossRef] [PubMed]

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W. Wan, Y. Chong, L. Ge, H. Noh, A. D. Stone, and H. Cao, “Time-reversed lasing and interferometric control of absorption,” Science 331, 889–892 (2011). [CrossRef] [PubMed]

32.

S. Thongrattanasiri, F. H. L. Koppens, and F. J. G. de Abajo, “Complete optical absorption in periodically patterned graphene,” Phys. Rev. Lett. 108, 047401 (2012). [CrossRef] [PubMed]

33.

A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal, and L. Martin-Moreno, “Surface plasmon enhanced absorption and suppressed transmission in periodic arrays of graphene ribbons,” Phys. Rev. B 85, 081405(R) (2012). [CrossRef]

34.

C. Wu, B. Neuner, G. Shvets, J. John, A. Milder, B. Zollars, and S. Savoy, “Large-area wide-angle spectrally selective plasmonic absorber,” Phys. Rev. B 84, 075102 (2011). [CrossRef]

35.

W. W. Salisbury, “Absorbent body for electromagnetic waves,” US Patent 2599944 (1952).

36.

H. T. Chen, “Interference theory of metamaterial perfect absorbers,” Opt. Express 20, 7165–7172 (2012). [CrossRef] [PubMed]

37.

L. Huang, D. R. Chowdhury, S. Ramani, M. T. Reiten, S.-N. Luo, A. K. Azad, A. J. Taylor, and H. T. Chen, “Impact of resonator geometry and its coupling with ground plane on ultrathin metamaterial perfect absorbers,” Appl. Phys. Lett. 101, 101102 (2012). [CrossRef]

38.

P. Yeh, Optical Waves in Layered Media (Wiley, New York, 2005).

39.

G. W. Hanson, “Dyadic Greens functions and guided surface waves on graphene,” J. Appl. Phys. 103, 064302 (2006). [CrossRef]

40.

L. A. Falkovsky and S. S. Pershoguba, “Optical Far-Infrared Properties of a Graphene Monolayer and Multilayer,” Phys. Rev. B 76, 153410 (2007). [CrossRef]

41.

E. H. Hwang and S. Das Sarma “Dielectric function, screening, and plasmons in two-dimensional graphene,” Phys. Rev. B 75, 205418 (2007). [CrossRef]

42.

V. P. Gusynin, S. G. Sharapov, and J. P. Carbotte “Conductivity Magneto-optical in Graphene,” J. Phys. Condens. Matter , 19, 026222 (2007). [CrossRef]

43.

L. Li, “New formulation of the fourier modal method for crossed surface-relief gratings,” J. Opt. Soc. Am. A 14, 2758–2767 (1997). [CrossRef]

OCIS Codes
(310.3915) Thin films : Metallic, opaque, and absorbing coatings
(160.3918) Materials : Metamaterials
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Metamaterials

History
Original Manuscript: September 18, 2012
Revised Manuscript: October 25, 2012
Manuscript Accepted: October 25, 2012
Published: December 3, 2012

Citation
Rasoul Alaee, Mohamed Farhat, Carsten Rockstuhl, and Falk Lederer, "A perfect absorber made of a graphene micro-ribbon metamaterial," Opt. Express 20, 28017-28024 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-27-28017


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