arXiv 2108.044672021-08-10physics.optics

Collimation and finite-size effects in suspended resonant guided-mode gratings

Christian Toft-Vandborg, Alexios Parthenopoulos, Ali Akbar Darki, Aurélien Dantan

备注：: 13 pages, 13 figures
发表信息：: JOSA A 38, 1714 (2021)
DOI：: 10.1364/JOSAA.440215

英文摘要：

The optical transmission of resonant guided-mode gratings patterned on suspended silicon nitride thin films and illuminated at normal incidence with a Gaussian beam are investigated both experimentally and theoretically. Effects due to the beam focusing and its finite size are accounted for by a phenomenological coupled mode model whose predictions are found to be in very good agreement with the experimentally measured spectra for various grating structures and beam sizes, and which allow for a detailed analysis of the respective magnitude of these effects. These results are highly relevant for the design and optimization of such suspended structured films which are widely used for photonics, sensing and optomechanics applications.

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