Bandwidth tunable guided-mode resonance filter using contact coupled gratings at oblique incidence.pdfVIP

Bandwidth tunable guided-mode resonance filter using contact coupled gratings at oblique incidence.pdf

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Bandwidth tunable guided-mode resonance filter using contact coupled gratings at oblique incidence.pdf

Optics Communications 382 (2017) 138–143 Contents lists available at ScienceDirect Optics Communications journal homepage: /locate/optcom Bandwidth tunable guided-mode resonance ?lter using contact coupled gratings at oblique incidence Tian Sang n, Yueke Wang, Junlang Li, Jianyu Zhou, Wenwen Jiang, Jicheng Wang, Guoqing Chen Department of Photoelectric Information Science and Engineering, School of Science, Jiangnan University, Wuxi 214122, China article info Article history: Received 31 May 2016 Received in revised form 5 July 2016 Accepted 11 July 2016 Available online 6 August 2016 Keywords: Bandwidth tunable Guided-mode resonance ?lter Contact coupled gratings Oblique incidence abstract A novel bandwidth tunable guided-mode resonance ?lter (GMRF) is proposed based on the contact coupled gratings (CCGs) with the absentee layers at oblique incidence. The design principle of the CCGs with double absentee layers is presented. The lateral shift of the CCGs changes the magnetic ?eld distributions of the waveguide mode in the grating cavity and the surface-con?ned mode at the cover/ grating interface thus facilitates the dynamic control of both the spectral and angular bandwidth of the GMRF. The resonance locations are almost immune to the variation of the lateral shift of the CCGs. The sideband level of the GMRF is almost unaffected by the lateral shift due to the Brewster AR effect. The resonance peak red-shifts quasi-linearly as the incident angle is increased, and the resonance wavelength can be selected by merely tuning the incident angle. The tunable ranges of both the spectral and angular bandwidth can be signi?cantly enhanced by increasing the refractive-index contrast. Low-sideband re?ection with controllable bandwidth at 650 nm is designed to demonstrate this concept. 2016 Elsevier B.V. All rights reserved. 1. Introduction Guided-mode resonance ?lters (GMRFs) have attracted considerable interest due to their simple structures with versatile spectral characte

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