Narrowband Retroreflector Using Guided Mode Resonance for Oblique Incidence

Kusuura, Toshiki; Akamatsu, Keita; Inoue, Jun‐ichi; Kintaka, Kenji; Ura, Shogo

doi:10.23919/ps.2019.8817885

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2020

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“…Using CRIGF under oblique incidence could be of interest for some applications. During the first semester of 2019, two conference papers reported on CRIGF for oblique incidence, the first one from our team, and the second one from S. Ura's team [9,10]. In the present paper, our goal is to bring a further theoretical analysis of the behavior of CRIGF under oblique incidence.…”

Section: Introductionmentioning

confidence: 94%

Quasi-total backward reflection with a CRIGF under oblique incidence

et al. 2020

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We report on a numerical study of Cavity Resonator Integrated Grating Filters (a grating coupler flanked with two distributed Bragg reflectors) under oblique incidence. At resonance, the diffracted energy is divided equally in four outcoupling directions, versus two directions only for the CRIGF under normal incidence and for the infinite grating coupler. We provide a simple model to demonstrate this fact. Then, we propose a configuration for which all the diffracted energy is reflected backward with respect to the direction of the incident beam, thus realizing a reflection filter free from specular reflectivity.

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Section: Introductionmentioning

confidence: 94%