Vertical-cavity surface-emitting phase shifter

D. Almutairi; A. Smolyaninov; A. Ingram; N. Alshamrani; A. Grieco; Y. Fainman

doi:10.1117/12.2577943

5 March 2021 Vertical-cavity surface-emitting phase shifter

D. Almutairi, A. Smolyaninov, A. Ingram, N. Alshamrani, A. Grieco, Y. Fainman

Proceedings Volume 11706, Light-Emitting Devices, Materials, and Applications XXV; 117061T (2021) https://doi.org/10.1117/12.2577943
Event: SPIE OPTO, 2021, Online Only

Conference Poster

Abstract

In this work we theoretically propose a novel method towards obtaining a two-dimensional beam steering system which could be used for LIDAR applications. The method utilizes a hybrid plasmonic waveguide in a cylindrical topology creating a nanoscale vertical cavity surface emitting phaseshifter (VCSEP). This approach enables a sub-wavelength spacing between each phase shifter and therefore provides a larger field of view. Each VCSEP consists of a highly doped sub-micron silicon pillar coated with a thin layer of non-linear material then another layer of conductive metal. The input optical carrier is inserted from the polished back side of the silicon substrate, which is then modulated by the phase shifter and re-emitted in the vertical direction to form a beam in the far field. The hybrid plasmonic localization increases the effective interaction length of the light with the non-linear material within a silicon core resonant cavity. Increased interaction length due to plasmonic effects in the vertical architecture leads to an enhanced phase shift. A lower loss is possible while retaining high localization due to an overlap of photonic mode and plasmonic modes. The impedance mismatch between the vertical hybrid plasmonic waveguide and free space will create a low finesse, low-Q cavity resonator. The single VCSEP device can be considered as a low finesse Fabry-Perot resonator that can be used for phase modulation with less than 3dB amplitude modulation. We characterized the optical response of a single VCSEP, with an aspect ratio of 12.5 which has an FSR of 47.25±2.5nm and transmission variation of 3dB.

Conference Presentation

Citation Download Citation

D. Almutairi, A. Smolyaninov, A. Ingram, N. Alshamrani, A. Grieco, and Y. Fainman "Vertical-cavity surface-emitting phase shifter", Proc. SPIE 11706, Light-Emitting Devices, Materials, and Applications XXV, 117061T (5 March 2021); https://doi.org/10.1117/12.2577943

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