Donda, Krupali D.Krupali D.DondaHegde, Ravi SadanandaRavi SadanandaHegde2025-08-302025-08-302017-10-0110.1117/1.JNP.11.0460022-s2.0-85041307003https://d8.irins.org/handle/IITG2025/23012High-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 2π) 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.falseCMOS-compatible | Integrated optics, theory, and simulation | Metasurface | NanoantennaArticle193426081 October 20172046002arJournal0