Monolithic all-silicon flat lens for broadband LWIR imaging
Abstract
We designed, fabricated, and characterized a flat multi-level diffractive lens comprised of only silicon with d i a m e t e r = 15.2 m m , focal l e n g t h = 19 m m , numerical aperture of 0.371, and operating over the long-wave infrared (LWIR) s p e c t r u m = 8 µ m to 14 µm. We experimentally demonstrated a field of view of 46°, depth of focus > --> 5 m m , and wavelength-averaged Strehl ratio of 0.46. All of these metrics were comparable to those of a conventional refractive lens. The active device thickness is only 8 µm, and its weight (including the silicon substrate) is less than 0.2 g.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 13, 2021
- Source ID
- 10.1364/ol.426384
Entities
People
- Berardi Sensale-Rodriguez
- Brian Baker
- Monjurul Meem
- Orrin Kigner
- Philip W. C. Hon
- Rajesh Menon
- Sourangsu Banerji
Organizations
- National Science Foundation
- Office of Naval Research
- University of Utah