Angle- and Polarization-Independent Mid-Infrared Narrowband Optical Filters Using Dense Arrays of Resonant Cavities (Preprint)
Abstract
We report design and experimental verification of narrowband mid-infrared optical filters with transmission characteristics that are practically constant over a wide range of incident angles. The filter employs a dense array of dielectric resonant cavities in a metal film, where the transmission of each cavity depends upon localized rather than travelling fields, making the filter fundamentally angle-independent. We show experimentally a transmission around 90% from normal incidence up to 60. Simulations show that the filter becomes polarization-independent when geometry of the cavities is azimuthally symmetric.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 23, 2019
- Accession Number
- AD1090129
Entities
People
- E. M. Smith
- Ivan Avrutsky
- Joshua R Hendrickson
- Justin W. Cleary
- Ricky Gibson
- Shivashankar Vangala
Organizations
- Air Force Research Laboratory