12 October 2017 Bilayered nanoantenna design improves the performance of silicon metasurfaces in the visible-wavelength region
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Abstract
High-transmissivity all-dielectric metasurfaces have recently attracted attention toward the realization of ultracompact optical devices and systems. Silicon-based metasurfaces, in particular, are highly promising considering the possibility of monolithic integration with complementary metal–oxide–semiconductor very large scale integration circuits. Realization of silicon-based metasurfaces operational in the visible wavelengths, however, remains a challenge. A numerical study of bilayered truncated-cone shaped nanoantenna elements is presented. Metasurfaces based on the proposed stepped conical geometry can be designed for operation in the 700- to 800-nm wavelength window and can achieve full-cycle phase response (0 to 2 π ) with an improved transmittance in comparison with the previously reported cylindrical geometry. A systematic parameter study of the influence of various geometrical parameters on the achievable amplitude and phase coverage is reported.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Krupali D. Donda, Krupali D. Donda, Ravi Sadananda Hegde, Ravi Sadananda Hegde, } "Bilayered nanoantenna design improves the performance of silicon metasurfaces in the visible-wavelength region," Journal of Nanophotonics 11(4), 046002 (12 October 2017). https://doi.org/10.1117/1.JNP.11.046002 . Submission: Received: 27 April 2017; Accepted: 18 September 2017
Received: 27 April 2017; Accepted: 18 September 2017; Published: 12 October 2017
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