Previous works ascribe the broadband high-reflectivity features of high-contrast gratings (HCGs) to dual-mode interference effects occurring in the grating bars, which are a characteristic of their near-wavelength operation regime. Using this fundamental characteristic this work exploits a bimodal Fabry-Pérot interferometer approach to better understand the HCG physics. This analytic framework allows to explain the 100% reflectivity peaks at the basis of the broadband operation, predicting their positions by closed-form expressions. A design strategy based on this approach is then presented, including a discussion on the impact of fabrication tolerances on the HCG performance.

Bimodal Operation of High-Contrast Gratings: The Generalized Fabry-Pérot Perspective / Tibaldi, A.; Debernardi, P.; Orta, R.. - ELETTRONICO. - (2019), pp. 3812-3816. (Intervento presentato al convegno 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) tenutosi a Roma nel 17-20 giugno 2019) [10.1109/PIERS-Spring46901.2019.9017611].

Bimodal Operation of High-Contrast Gratings: The Generalized Fabry-Pérot Perspective

Tibaldi, A.;Debernardi, P.;Orta, R.
2019

Abstract

Previous works ascribe the broadband high-reflectivity features of high-contrast gratings (HCGs) to dual-mode interference effects occurring in the grating bars, which are a characteristic of their near-wavelength operation regime. Using this fundamental characteristic this work exploits a bimodal Fabry-Pérot interferometer approach to better understand the HCG physics. This analytic framework allows to explain the 100% reflectivity peaks at the basis of the broadband operation, predicting their positions by closed-form expressions. A design strategy based on this approach is then presented, including a discussion on the impact of fabrication tolerances on the HCG performance.
2019
978-1-7281-3403-1
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2800634