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Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 4 — May. 4, 2011
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Active control over nanofocusing with nanorod plasmonic antennas

Ivan S. Maksymov and Andrey E. Miroshnichenko  »View Author Affiliations


Optics Express, Vol. 19, Issue 7, pp. 5888-5894 (2011)
http://dx.doi.org/10.1364/OE.19.005888


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Abstract

Active control over light nanofocusing in a nanorod plasmonic antenna coupled to a photonic crystal cavity is proposed and demonstrated by means of full-vectorial 3D simulations. By varying the excitation of the cavity with laser beam spot size allows us to achieve a gradual control over light nanofocusing at the tip of the nanoantenna. The demonstrated control mechanism eliminates the need for nonlinear effects or mechanical reconfiguration and represents a step towards the implementation of reliable tunable subwavelength light sources.

© 2011 OSA

1. Introduction

Plasmonic nanoantennas [1

1. P. Bharadwaj, B. Deutsch, and L. Novotny, “Optical antennas,” Adv. Opt. Photon . 1, 438–483 (2009). [CrossRef]

] attract an increasing interest in nanophotonics due to their demonstrated capability to support surface plasmon polaritons (SPPs) and confine light into ultra-small volumes much beyond its free-space wavelength [2

2. M. I. Stockman, “Nanofocusing of optical energy in tapered plasmonic waveguides,” Phys. Rev. Lett. 93, 137404 (2004). [CrossRef] [PubMed]

, 3

3. A. G. Curto, G. Volpe, T. H. Taminiau, M. P. Kreuzer, R. Quidant, and N. F. van Hulst, “Unidirectional emission of a quantum dot coupled to a nanoantenna,” Science 329, 930–933 (2010). [CrossRef] [PubMed]

]. Analogous to their radio and microwave counterparts [4

4. C. A. Balanis, Antenna Theory: Analysis and Design (Wiley, 2005).

], plasmonic nanoantennas efficiently convert free-propagating radiation to subwavelength-confined energy and vice-versa. Nanoantennas of various geometries have been applied successfully in nonlinear optics [5

5. A. R. Davoyan, I. V. Shadrivov, A. A. Zharov, D. K. Gramotnev, and Yu. S. Kivshar, “Nonlinear nanofocusing in tapered plasmonic waveguides,” Phys. Rev. Lett. 105, 116804 (2010). [CrossRef] [PubMed]

], nonclassical light emission [6

6. I. Maksymov, M. Besbes, J. P. Hugonin, J. Yang, A. Beveratos, I. Sagnes, I. Robert-Philip, and P. Lalanne, “Metal-coated nanocylinder cavity for broadband nonclassical light emission,” Phys. Rev. Lett. 105, 180502 (2010). [CrossRef]

], fluorescence enhancement [7

7. H. Rigneault, J. Capoulade, J. Dintinger, J. Wenger, N. Bonod, E. Popov, T. W. Ebbesen, and P.-F. Lenne“Enhancement of single-molecule fluorescence detection in subwavelength apertures,”Phys. Rev. Lett. 95, 117401 (2005). [CrossRef] [PubMed]

], high-harmonic generation [8

8. S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field espotnhancement,” Nature (London) 453, 757–760 (2008). [CrossRef]

], nanoscale photodetectors [9

9. L. Tang, S. E. Kocabas, S. Latif, A. K. Okyay, D.-S. Ly-Gagnon, K. C. Saraswat, and D. A. B. Miller“Nanometre-scale germanium photodetector enhanced by a near-infrared dipole antenna,”Nat. Photonics 2, 226–229 (2008). [CrossRef]

] and single-molecule detection [10

10. F. de Angelis, M. Patrini, G. Das, I. Maksymov, M. Galli, L. Businaro, L. C. Andreani, and E. di Fabrizio, “A hybrid plasmonic-photonic nanodevice for label free detection of a few molecules,” Nano Lett. 8, 2321–2327 (2008). [CrossRef] [PubMed]

].

These effects are however not efficient enough for full-optical control at practical pump powers and, more importantly, they do not offer any reliable mechanism for efficient control over light intensity in nano-hot-spot regions of nanoantennas. It hampers the implementation of nanoantennas in practice in situations where the hot-spot intensity may be critical and control over the intensity is highly desired.

In this paper, we propose and explore theoretically a plasmonic nanorod antenna capable of offering active control light enhancement at the tip. The nanoantenna is excited by an intermediate photonic crystal (PhC) cavity that ensures an optimal light-nanoantenna coupling [10

10. F. de Angelis, M. Patrini, G. Das, I. Maksymov, M. Galli, L. Businaro, L. C. Andreani, and E. di Fabrizio, “A hybrid plasmonic-photonic nanodevice for label free detection of a few molecules,” Nano Lett. 8, 2321–2327 (2008). [CrossRef] [PubMed]

] and allows tuning of light enhancement at the tip of the nanoantenna by altering cavity-mode excitation conditions. As the cavity without the nanoantenna sustains Fano resonances resulting from interactions between the continuum and the localized cavity states [17

17. U. Fano, “Effects of configuration interaction on intensities and phase shifts,” Phys. Rev. 124, 1866–1878 (1961). [CrossRef]

, 18

18. A. E. Miroshnichenko, S. Flach, and Yu. S. Kivshar, “Fano resonances in nanoscale structures,” Rev. Mod. Phys. 82, 2257–2298 (2010). [CrossRef]

], the physics of resonances is understood in the framework of the Fano theory applied to PhC cavities [19

19. M. Galli, S. L. Portalupi, M. Belotti, L. C. Andreani, L. O’Faolain, and T. F. Krauss, “Ligth scattering and Fano resonances in high-Q photonic crystal cavities,” Appl. Phys. Lett. 94, 071101 (2009). [CrossRef]

, 20

20. M. Barth, S. Schietinger, S. Fischer, J. Becker, N. Nüsse, T. Aichele, B. Löchel, C. Sönnichsen, and O. Benson, “Nanoassembled plasmonic-photonic hybrid cavity for tailored light-matter coupling,” Nano Lett. 10, 891–895 (2010). [CrossRef] [PubMed]

] and the optimal agreement with experimental data in [19

19. M. Galli, S. L. Portalupi, M. Belotti, L. C. Andreani, L. O’Faolain, and T. F. Krauss, “Ligth scattering and Fano resonances in high-Q photonic crystal cavities,” Appl. Phys. Lett. 94, 071101 (2009). [CrossRef]

] is observed. These results are then applied to the hybrid antenna-cavity architecture and active control over the nanofocusing is demonstrated.

2. Design and numerical tools

Fig. 1. (a) Schematic of the investigated architecture. (b) FDTD-calculated spectral response of the isolated PhC cavity (red-solid lines) and that of the cavity equipped with the plasmonic nanoantenna (NA, blue-solid line). Notice a strong mode damping in the presence of the nanoantenna. (c) |Ex| field of the fundamental TE mode calculated without the plasmonic nanoantenna at 2.3 eV. Cyan and green circles denote the regions covered by the laser beam spots with R = 2a and R = 6a, respectively.

Calculations of the transmission spectra and spatial distributions of the electromagnetic fields are performed by means of a 3D finite-difference time-domain (FDTD) method enforced with Convolution–Perfectly–Matched–Layers (CPML) absorbing boundary conditions [23

23. A. Taflove, Computational Electrodynamics: The Finite-Difference Time-Domain Method (Artech House, 2005).

]. The dielectric function of gold used in the simulations is based on a Drude model fit for the published optical constants of gold [24

24. E. D. Palik, ed., Handbook of Optical Constants of Solids (Academic Press, 1985).

]. A x-polarized point field source is used in the design procedure to excite the cavity.

Figure 1(b) shows the calculated spectral response of the nanocavity with (red-solid line) and without (blue-solid line) the plasmonic nanoantenna. When the nanoantenna is absent, a strong peak is observed at about 2.3 eV corresponding to the fundamental TE cavity mode. However, in the presence of the nanoantenna the peak is strongly suppressed indicating that the energy of the PhC cavity mode has been converted into an SPP mode of the nanoantenna. The |Ex| field distribution of the fundamental TE mode calculated in the middle of the PhC cavity without the nanoantenna at 2.3 eV is shown in Fig. 1(c).

3. Isolated cavity

Hereafter we assume that the fundamental cavity mode is strongly suppressed in the presence of the nanoantenna independently of cavity-mode excitation conditions. Thus, we start the investigation of the transmission properties of the PhC cavity without the nanoantenna first. We excite the fundamental cavity mode by linearly (TE) polarized laser beams of different spot radii. In the FDTD model the laser beam spot is controlled such that its radius R can be gradually changed between 2a and 6a, where a is the lattice constant of the PhC. As the optical properties of all materials are intensity-independent, the simulated laser power P, which is a constant in all calculations, can be taken arbitrarily. Two examples of beam spot areas are shown in Fig. 1(c). They correspond to the two opposite cases when the laser beam fully covers the cavity region (R = 2a) and when it covers the whole PhC structure (R = 6a).

Figure 2 shows the transmission spectra (green-solid lines) calculated for R = 2a and R = 6a. Both profiles exhibit asymmetric lineshapes; so do the profiles for other radii. This asymmetry can be fully explained in the framework of the Fano model [17

17. U. Fano, “Effects of configuration interaction on intensities and phase shifts,” Phys. Rev. 124, 1866–1878 (1961). [CrossRef]

]: it results from an interplay between a resonant transmission through the cavity and a nonresonant transmission through the PhC slab [19

19. M. Galli, S. L. Portalupi, M. Belotti, L. C. Andreani, L. O’Faolain, and T. F. Krauss, “Ligth scattering and Fano resonances in high-Q photonic crystal cavities,” Appl. Phys. Lett. 94, 071101 (2009). [CrossRef]

]. The ratio between the strengths of the resonant and the nonresonant components is known in the literature as the Fano asymmetry parameter q [17

17. U. Fano, “Effects of configuration interaction on intensities and phase shifts,” Phys. Rev. 124, 1866–1878 (1961). [CrossRef]

]. We fit the calculated transmission spectra with the Fano lineshape and analyze the obtained results in terms of q. According to [19

19. M. Galli, S. L. Portalupi, M. Belotti, L. C. Andreani, L. O’Faolain, and T. F. Krauss, “Ligth scattering and Fano resonances in high-Q photonic crystal cavities,” Appl. Phys. Lett. 94, 071101 (2009). [CrossRef]

], we use a Fano-fit formula F(E)=A0+F0[q+2(EE0)/Γ]21+[2(EE0)/Γ]2, where E 0 is the resonance energy of the cavity mode, Γ is the resonance linewidth, and A 0 and F 0 are constant factors. It produces best-fit curves and allows determining the values of q, E 0 and Γ for R varying between 2a and 6a.

Fig. 2. Transmission spectra (green-solid lines) and best-fits to the Fano lineshape (red-dashed line) of the PhC cavity without the nanoantenna calculated for R = 2a and R = 6a. Black-dashed lines highlight the resonance energy E 0 predicted with the Fano model. Note that E 0 may lie between the maximum and the minimum of the asymmetric profile [18].

Fig. 3. Fano model parameters obtained by means of the curve-fitting: (a) normalized Fano qN factor (blue circles) and normalized excitation area (SN ) (red-solid line), (b) resonance linewidth Γ, (c) resonance energy E 0 and (d) peak amplitude as a function of the spot radius R (in periods a of the PhC lattice).

Figures 3 (b)-(d) show the resonance linewidth Γ, the resonance energy E 0 and the peak amplitude of the cavity mode obtained by means of the curve-fitting and plotted as a function of the spot radius R. The calculated resonance energies and resonance linewidths are almost independent of the excitation conditions. This feature was also observed in the experiment [19

19. M. Galli, S. L. Portalupi, M. Belotti, L. C. Andreani, L. O’Faolain, and T. F. Krauss, “Ligth scattering and Fano resonances in high-Q photonic crystal cavities,” Appl. Phys. Lett. 94, 071101 (2009). [CrossRef]

] together with a decay of the maximum peak amplitude caused by the beam defocusing. Our calculations correctly reproduce this decay [blue circles in Fig. 3(a)], which follows the 1R dependence (black-dashed line).

4. Nanoantenna with cavity

Once the physics of the resonances of the isolated cavity has been understood under different excitation conditions, we return our attention to the cavity with the nanoantenna [see Fig. 1(a)] and demonstrate that light enhancement at the tip of the nanoantenna can be controlled by altering the excitation conditions of the PhC cavity. In order to prove that a control over light enhancement is only possible when the nanoantenna is excited by the cavity, we also investigate the enhancement at the tip of the same antenna but placed on an uniform 100 nm thick Si3N4 membrane.

We calculate field intensity profiles for the resonance energy value 2.295eV predicted with the Fano model [see Fig. 3(c)]. The intensity detected by a monitor located at the very tip of the nanoantenna is plotted in Fig. 4(a) as a function of R. Red circles denote the intensity of the nanoantenna excited by the cavity. Blue squares denote the intensity of the same nanoantenna placed on the uniform membrane. The results are normalized such that the intensity at the tip of the nanoantenna with the cavity at R = 2a corresponds to 0 dB.

Fig. 4. (a) Intensity at the very tip of the nanoantenna with (red circles) and without (blue circles) the cavity for different R. Inset: the same plot in log scale. (b) Intensity at the surface of the tip of the nanoantenna with and without the cavity for R = 2a. (c) Intensity at the very tip of the nanoantenna excited by the cavity as a function of the laser frequency. The oblique line, a guide to the eye, connects the maxima in the spectra.

In the presence of the cavity [red circles in Fig. 4(a)] we observe a gradual decrease of the intensity at the tip of the nanoantenna caused by the corresponding change in R. This finding convincingly supports our assumption that light nanofocusing at the nanoantenna tip can be controlled by altering the excitation conditions. As shown in Fig. 4(a) with blue squares, in contrast to the nanoantenna excited by the cavity the excitation of the nanoantenna with the uniform membrane is significantly less efficient and the intensity at the tip decreases much faster. The comparison of the intensities at the surface of the tip of the both antennas for R = 2a [Fig. 4 (b)] additionally demonstrates a poor performance of the nanoantenna without the cavity. We notice that light nanofocusing can be controlled by varying the spot size of a laser beam under practical technical conditions. It is enough to defocus the beam up to R = 6a in order to obtain the intensity level of about −20 dB and turn off the antenna.

The change of the Fano lineshapes influenced by the defocusing of the laser beam also offers a spectral tuning. In order to demonstrate it, we plot the intensity at the very tip of the nanoantenna as a function of the laser frequency. We limit ourselves to considering the spot radii of 2a, 3a and 4a. Further laser spot defocusing results in low intensity levels where spectral tuning is not worth the effort. Figure 4(c) shows that the maximum of the intensity can be shifted by ∼ 1.7 nm by changing the spot radius (compare 2.284eV for R = 2a and 2.291eV for R = 4a). The significance of this result achieved by simple defocusing can be better understood by comparing the efforts made to obtain this shift with the efforts in achieving a comparable shift with a 2D nonlinear PhC pumped by a high-intensity laser [25

25. M. Belotti, J. F. Galisteo López, S. De Angelis, M. Galli, I. Maksymov, L. C. Andreani, D. Peyrade, and Y. Chen, “All-optical switching in 2D silicon photonic crystals with low loss waveguides and optical cavities,” Opt. Express16, 11624–11636 (2008), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-15-11624. [PubMed]

]. According to [25

25. M. Belotti, J. F. Galisteo López, S. De Angelis, M. Galli, I. Maksymov, L. C. Andreani, D. Peyrade, and Y. Chen, “All-optical switching in 2D silicon photonic crystals with low loss waveguides and optical cavities,” Opt. Express16, 11624–11636 (2008), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-15-11624. [PubMed]

], a shift of 1.5 nm can be achieved by locally lowering the refractive index of the cavity by 0.23%, a value which is hardly attainable. The observed light-controlled frequency shift is also comparable to that obtained with a chain of metal particles embedded into dielectric shells made of a Kerr optical material [26

26. N.-C. Panoiu and R. M. Osgood Jr., “Subwavelength nonlinear plasmonic nanowire,” Nano Lett. 4, 2427–2430 (2004). [CrossRef]

].

5. Conclusions

We have demonstrated a novel control mechanism over light nanofocusing in a nanorod plasmonic antenna excited by an intermediate photonic-crystal resonator structure. The investigated nanoantenna is fully compatible with atomic force microscopy (AFM) and Raman microscopy. It opens up a number of significant opportunities for nanoscale analysis of biological substances, where the intensity of nanofocused light may be critical. We believe that the explored control mechanism has a considerable potential for applications in which reliable tunable sub-wavelength visible light sources are of utmost importance.

Acknowledgments

The authors thank Prof. Yuri Kivshar for the overall support and encouragements. I.M. thanks Dr. Artur Davoyan and Dr. Alex Minovich for valuable discussions. This work was supported by the Australian Research Council.

References and links

1.

P. Bharadwaj, B. Deutsch, and L. Novotny, “Optical antennas,” Adv. Opt. Photon . 1, 438–483 (2009). [CrossRef]

2.

M. I. Stockman, “Nanofocusing of optical energy in tapered plasmonic waveguides,” Phys. Rev. Lett. 93, 137404 (2004). [CrossRef] [PubMed]

3.

A. G. Curto, G. Volpe, T. H. Taminiau, M. P. Kreuzer, R. Quidant, and N. F. van Hulst, “Unidirectional emission of a quantum dot coupled to a nanoantenna,” Science 329, 930–933 (2010). [CrossRef] [PubMed]

4.

C. A. Balanis, Antenna Theory: Analysis and Design (Wiley, 2005).

5.

A. R. Davoyan, I. V. Shadrivov, A. A. Zharov, D. K. Gramotnev, and Yu. S. Kivshar, “Nonlinear nanofocusing in tapered plasmonic waveguides,” Phys. Rev. Lett. 105, 116804 (2010). [CrossRef] [PubMed]

6.

I. Maksymov, M. Besbes, J. P. Hugonin, J. Yang, A. Beveratos, I. Sagnes, I. Robert-Philip, and P. Lalanne, “Metal-coated nanocylinder cavity for broadband nonclassical light emission,” Phys. Rev. Lett. 105, 180502 (2010). [CrossRef]

7.

H. Rigneault, J. Capoulade, J. Dintinger, J. Wenger, N. Bonod, E. Popov, T. W. Ebbesen, and P.-F. Lenne“Enhancement of single-molecule fluorescence detection in subwavelength apertures,”Phys. Rev. Lett. 95, 117401 (2005). [CrossRef] [PubMed]

8.

S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field espotnhancement,” Nature (London) 453, 757–760 (2008). [CrossRef]

9.

L. Tang, S. E. Kocabas, S. Latif, A. K. Okyay, D.-S. Ly-Gagnon, K. C. Saraswat, and D. A. B. Miller“Nanometre-scale germanium photodetector enhanced by a near-infrared dipole antenna,”Nat. Photonics 2, 226–229 (2008). [CrossRef]

10.

F. de Angelis, M. Patrini, G. Das, I. Maksymov, M. Galli, L. Businaro, L. C. Andreani, and E. di Fabrizio, “A hybrid plasmonic-photonic nanodevice for label free detection of a few molecules,” Nano Lett. 8, 2321–2327 (2008). [CrossRef] [PubMed]

11.

F. Zhou, Y. Liu, Z.-Y. Li, and Y. Xia, “Analytical model for optical bistability in nonlinear metal nano-antennae involving Kerr materials,” Opt. Express18, 13337–13344 (2010), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-18-13-13337. [CrossRef] [PubMed]

12.

Y. Chen, P. Lodhal, and A. F. Koenderink, “Dynamically reconfigurable directionality of plasmon-based single photon sources,” Phys. Rev. B 82, 081402(R) (2010).

13.

K. F. MacDonald, Z. L. Sámson, M. I. Stockman, and N. I. Zheludev, “Ultrafast active plasmonics,” Nat. Photonics 3, 55–58 (2009). [CrossRef]

14.

G. A. Wurtz, R. Pollard, and A. V. Zayats, “Optical bistability in nonlinear surface-plasmon polaritonic crystals,” Phys. Rev. Lett. 97, 057404 (2006). [CrossRef]

15.

O. L. Muskens, N. Del Fatti, and F. Vallée, “Femtosecond response of a single metal nanoparticle,” Nano Lett. 6, 552–556 (2006). [CrossRef] [PubMed]

16.

V. Giannini, A. Berrier, S. A. Maier, J. A. Sánchez-Gil, and J. Gómez Rivas, “Scattering efficiency and near field ′ enhancement of active semiconductor plasmonic antennas at terahertz frequencies,” Opt. Express18, 2797–2807 (2010), http://www.opticsinfobase.org/abstract.cfm?URI=oe-18-3-2797. [CrossRef] [PubMed]

17.

U. Fano, “Effects of configuration interaction on intensities and phase shifts,” Phys. Rev. 124, 1866–1878 (1961). [CrossRef]

18.

A. E. Miroshnichenko, S. Flach, and Yu. S. Kivshar, “Fano resonances in nanoscale structures,” Rev. Mod. Phys. 82, 2257–2298 (2010). [CrossRef]

19.

M. Galli, S. L. Portalupi, M. Belotti, L. C. Andreani, L. O’Faolain, and T. F. Krauss, “Ligth scattering and Fano resonances in high-Q photonic crystal cavities,” Appl. Phys. Lett. 94, 071101 (2009). [CrossRef]

20.

M. Barth, S. Schietinger, S. Fischer, J. Becker, N. Nüsse, T. Aichele, B. Löchel, C. Sönnichsen, and O. Benson, “Nanoassembled plasmonic-photonic hybrid cavity for tailored light-matter coupling,” Nano Lett. 10, 891–895 (2010). [CrossRef] [PubMed]

21.

A. Normatov, P. Ginzburg, N. Berkovitch, G. M. Lerman, A. Yanai, U. Levy, and M. Orenstein, “Efficient coupling and field enhancement for the nano-scale: plasmonic needle,” Opt. Express18, 14079–14086 (2010), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-18-13-14079. [CrossRef] [PubMed]

22.

F. de Angelis, G. Das, P. Candeloro, M. Patrini, M. Galli, A. Bek, M. Lazzarino, I. Maksymov, C. Liberale, L. C. Andreani, and E. di Fabrizio, “Nanoscale chemical mapping using three-dimensional adiabatic compression of surface plasmon polaritons,” Nat. Nanotechnol. 5, 67–72 (2010). [CrossRef]

23.

A. Taflove, Computational Electrodynamics: The Finite-Difference Time-Domain Method (Artech House, 2005).

24.

E. D. Palik, ed., Handbook of Optical Constants of Solids (Academic Press, 1985).

25.

M. Belotti, J. F. Galisteo López, S. De Angelis, M. Galli, I. Maksymov, L. C. Andreani, D. Peyrade, and Y. Chen, “All-optical switching in 2D silicon photonic crystals with low loss waveguides and optical cavities,” Opt. Express16, 11624–11636 (2008), http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-15-11624. [PubMed]

26.

N.-C. Panoiu and R. M. Osgood Jr., “Subwavelength nonlinear plasmonic nanowire,” Nano Lett. 4, 2427–2430 (2004). [CrossRef]

OCIS Codes
(020.3690) Atomic and molecular physics : Line shapes and shifts
(240.6680) Optics at surfaces : Surface plasmons
(260.5740) Physical optics : Resonance
(050.5298) Diffraction and gratings : Photonic crystals
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

History
Original Manuscript: January 13, 2011
Revised Manuscript: March 4, 2011
Manuscript Accepted: March 5, 2011
Published: March 15, 2011

Virtual Issues
Vol. 6, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Ivan S. Maksymov and Andrey E. Miroshnichenko, "Active control over nanofocusing with nanorod plasmonic antennas," Opt. Express 19, 5888-5894 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-19-7-5888


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References

  1. P. Bharadwaj, B. Deutsch, and L. Novotny, “Optical antennas,” Adv. Opt. Photon . 1, 438–483 (2009). [CrossRef]
  2. M. I. Stockman, “Nanofocusing of optical energy in tapered plasmonic waveguides,” Phys. Rev. Lett. 93, 137404 (2004). [CrossRef] [PubMed]
  3. A. G. Curto, G. Volpe, T. H. Taminiau, M. P. Kreuzer, R. Quidant, and N. F. van Hulst, “Unidirectional emission of a quantum dot coupled to a nanoantenna,” Science 329, 930–933 (2010). [CrossRef] [PubMed]
  4. C. A. Balanis, Antenna Theory: Analysis and Design (Wiley, 2005).
  5. A. R. Davoyan, I. V. Shadrivov, A. A. Zharov, D. K. Gramotnev, and Yu. S. Kivshar, “Nonlinear nanofocusing in tapered plasmonic waveguides,” Phys. Rev. Lett. 105, 116804 (2010). [CrossRef] [PubMed]
  6. I. Maksymov, M. Besbes, J. P. Hugonin, J. Yang, A. Beveratos, I. Sagnes, I. Robert-Philip, and P. Lalanne, “Metal-coated nanocylinder cavity for broadband nonclassical light emission,” Phys. Rev. Lett. 105, 180502 (2010). [CrossRef]
  7. H. Rigneault, J. Capoulade, J. Dintinger, J. Wenger, N. Bonod, E. Popov, T. W. Ebbesen, and P.-F. Lenne“Enhancement of single-molecule fluorescence detection in subwavelength apertures,”Phys. Rev. Lett. 95, 117401 (2005). [CrossRef] [PubMed]
  8. S. Kim, J. Jin, Y.-J. Kim, I.-Y. Park, Y. Kim, and S.-W. Kim, “High-harmonic generation by resonant plasmon field espotnhancement,” Nature (London) 453, 757–760 (2008). [CrossRef]
  9. L. Tang, S. E. Kocabas, S. Latif, A. K. Okyay, D.-S. Ly-Gagnon, K. C. Saraswat, and D. A. B. Miller“Nanometre-scale germanium photodetector enhanced by a near-infrared dipole antenna,”Nat. Photonics 2, 226–229 (2008). [CrossRef]
  10. F. de Angelis, M. Patrini, G. Das, I. Maksymov, M. Galli, L. Businaro, L. C. Andreani, and E. di Fabrizio, “A hybrid plasmonic-photonic nanodevice for label free detection of a few molecules,” Nano Lett. 8, 2321–2327 (2008). [CrossRef] [PubMed]
  11. F. Zhou, Y. Liu, Z.-Y. Li, and Y. Xia, “Analytical model for optical bistability in nonlinear metal nano-antennae involving Kerr materials,” Opt. Express 18, 13337–13344 (2010), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-18-13-13337 . [CrossRef] [PubMed]
  12. Y. Chen, P. Lodhal, and A. F. Koenderink, “Dynamically reconfigurable directionality of plasmon-based single photon sources,” Phys. Rev. B 82, 081402(R) (2010).
  13. K. F. MacDonald, Z. L. Sámson, M. I. Stockman, and N. I. Zheludev, “Ultrafast active plasmonics,” Nat. Photonics 3, 55–58 (2009). [CrossRef]
  14. G. A. Wurtz, R. Pollard, and A. V. Zayats, “Optical bistability in nonlinear surface-plasmon polaritonic crystals,” Phys. Rev. Lett. 97, 057404 (2006). [CrossRef]
  15. O. L. Muskens, N. Del Fatti, and F. Vallée, “Femtosecond response of a single metal nanoparticle,” Nano Lett. 6, 552–556 (2006). [CrossRef] [PubMed]
  16. V. Giannini, A. Berrier, S. A. Maier, J. A. Sánchez-Gil, and J. Gómez Rivas, “Scattering efficiency and near field ′ enhancement of active semiconductor plasmonic antennas at terahertz frequencies,” Opt. Express 18, 2797–2807 (2010), http://www.opticsinfobase.org/abstract.cfm?URI=oe-18-3-2797 . [CrossRef] [PubMed]
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