Concurrent spatial and spectral filtering by resonant nanogratingsopen access
- Authors
- Niraula, Manoj; Yoon, Jae Woong; Magnusson, Robert
- Issue Date
- Aug-2015
- Publisher
- OPTICAL SOC AMER
- Citation
- OPTICS EXPRESS, v.23, no.18, pp.23428 - 23449
- Indexed
- SCIE
SCOPUS
- Journal Title
- OPTICS EXPRESS
- Volume
- 23
- Number
- 18
- Start Page
- 23428
- End Page
- 23449
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/142935
- DOI
- 10.1364/OE.23.023428
- ISSN
- 10944087
- Abstract
- Optical devices incorporating resonant periodic layers constitute an emerging technological area. Recent advances include spectral filters, broadband mirrors, and polarizers. Here, we demonstrate concurrent spatial and spectral filtering as a new outstanding attribute of this device class. This functionality is enabled by a unique, near-complete, reflection state that is discrete in both angular and spectral domains and realized with carefullycrafted nanogratings operating in the non-subwavelength regime. We study the pathway and inter-modal interference effects inducing this intriguing reflection state. In a proof-of-concept experiment, we obtain angular and spectral bandwidths of ∼4 mrad and ∼1 nm, respectively. This filter concept can be used for focus-free spectral and spatial filtering in compact holographic and interferometric optical instruments.
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