Nonlinear infrared plasmonic waveguide arrays
- 244 Downloads
The large negative permittivity of noble metals in the infrared region prevents the possibility of highly confined plasmons in simple waveguide structures such as thin films or rods. This is a critical obstacle to applications of nonlinear plasmonics in the telecommunication wavelength region. We theoretically propose and numerically demonstrate that such limitation can be overcome by exploiting inter-element coupling effects in a plasmonic waveguide array. The supermodes of a plasmonic array span a large range of effective indices, making these structures ideal for broadband mode-multiplexed interconnects for integrated photonic devices. We show such plasmonic waveguide arrays can significantly enhance nonlinear optical interactions when operating in a high-index, tightly bound supermode. For example, a third-order nonlinear coefficient in such a waveguide can be more than three orders of magnitude larger compared to silicon waveguides of similar dimensions. These findings open new design possibilities towards the application of plasmonics in integrated optical devices in the telecommunications spectral region.
Keywordsinfrared plasmonics plasmonic waveguides nonlinear plasmonics waveguide theory waveguide arrays
Unable to display preview. Download preview PDF.
- Sorger, V. J.; Ye, Z. L.; Oulton, R. F.; Wang, Y.; Bartal, G.; Yin, X. B.; Zhang, X. Experimental demonstration of low-loss optical waveguiding at deep sub-wavelength scales. Nat. Commun. 2011, 2, 331.Google Scholar
- Mrejen, M.; Suchowski, H.; Hatakeyama, T.; Wu, C.; Feng, L.; O’Brien, K.; Wang, Y.; Zhang, X. Adiabatic eliminationbased coupling control in densely packed subwavelength waveguides. Nat. Commun. 2015, 6, 7565.Google Scholar
- Johnson, P. B.; Christy, R.-W. Optical constants of the noble metals. Phys. Rev. B 1972, 6, 4370–4379.Google Scholar
- West, P. R.; Ishii, S.; Naik, G. V.; Emani, N. K.; Shalaev, V. M.; Boltasseva, A. Searching for better plasmonic materials. Laser Photon. Rev. 2010, 4, 795–808.Google Scholar
- Naik, G. V.; Kim, J.; Boltasseva, A. Oxides and nitrides as alternative plasmonic materials in the optical range ai][Invited]. Opt. Mater. Express 2011, 1, 1090–1099.Google Scholar
- Naik, G. V.; Shalaev, V. M.; Boltasseva, A. Alternative plasmonic materials: Beyond gold and silver. Adv. Mater. 2013, 25, 3264–3294.Google Scholar
- Rudnick, J.; Stern, E. A. Second-harmonic radiation from metal surfaces. Phys. Rev. B 1971, 4, 4274–4290.Google Scholar
- Ciraci, C.; Poutrina, E.; Scalora, M.; Smith, D. R. Secondharmonic generation in metallic nanoparticles: Clarification of the role of the surface. Phys. Rev. B 2012, 86, 115451.Google Scholar
- O’Brien, K.; Suchowski, H.; Rho, J.; Salandrino, A.; Kante, B.; Yin, X. B.; Zhang, X. Predicting nonlinear properties of metamaterials from the linear response. Nat. Mater. 2015, 14, 379–383.Google Scholar
- Yariv, A. Quantum Electronics, 3rd ed.; John WieLy & Sons: New York, 1989; pp 389.Google Scholar