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Miniaturization of a-Si guided mode resonance filter arrays for near-IR multi-spectral filtering

Ng, Ryan C. and Garcia, Juan C. and Greer, Julia R. and Fountaine, Katherine T. (2020) Miniaturization of a-Si guided mode resonance filter arrays for near-IR multi-spectral filtering. Applied Physics Letters, 117 (11). Art. No. 111106. ISSN 0003-6951.

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Sub-wavelength periodic arrays exhibit narrow near-unity reflection bands that arise from guided mode resonances. These resonances have extremely high quality factor (i.e., narrow band features) and are ideal for filtering applications. A high quality factor requires many periods, causing large lateral footprints that limit an imaging system's spatial resolution. We present a 1D ultra-thin (<100 nm) compact finite design of seven periods of amorphous Si slabs with subwavelength periodicity surrounded by Al mirrors, which allow the finite array to approximate an infinite array and enabling a small footprint (∼5 μm), for near-infrared applications (λ = 800–2000 nm). We demonstrate spectral tunability (amplitude, bandwidth, and peak location) via geometric parameter variation and demonstrate the performance of these filters both in experiment and in simulation. This work miniaturizes guided-mode resonance filters, previously limited by extremely large footprints, while being relatively cheap and simple to fabricate compared to many existing designs.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ng, Ryan C.0000-0002-0527-9130
Greer, Julia R.0000-0002-9675-1508
Fountaine, Katherine T.0000-0002-0414-8227
Additional Information:© 2020 The Author(s). Published under license by AIP Publishing. Submitted: 6 August 2020. Accepted: 3 September 2020. Published Online: 18 September 2020. The authors gratefully acknowledge the financial support of the Department of Defense through J.R.G.'s Vannevar-Bush Faculty Fellowship (No. N00014-16-1-2827) and the critical support and infrastructure provided by the Kavli Nanoscience Institute at Caltech. The authors also thank Harry Atwater for computational resources used to calculate a portion of these results. DATA AVAILABILITY. The data that support the findings of this study are available from the corresponding author upon reasonable request.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Vannever Bush Faculty FellowshipN00014-16-1-2827
Issue or Number:11
Record Number:CaltechAUTHORS:20200924-144351561
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105525
Deposited By: George Porter
Deposited On:25 Sep 2020 01:11
Last Modified:14 Sep 2021 08:05

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