Multifunctional volumetric meta-optics for color and polarization image sensors
Abstract
Three-dimensional elements, with refractive index distribution structured at subwavelength scale, provide an expansive optical design space that can be harnessed for demonstrating multifunctional free-space optical devices. Here we present 3D dielectric elements, designed to be placed on top of the pixels of image sensors, that sort and focus light based on its color and polarization with efficiency significantly surpassing 2D absorptive and diffractive filters. The devices are designed via iterative gradient-based optimization to account for multiple target functions while ensuring compatibility with existing nanofabrication processes, and they are experimentally validated using a scaled device that operates at microwave frequencies. This approach combines arbitrary functions into a single compact element, even where there is no known equivalent in bulk optics, enabling novel integrated photonic applications.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 31, 2020
- Source ID
- 10.1364/optica.384228
Entities
People
- Andrei Faraon
- Conner Ballew
- Gregory Roberts
- Philip Camayd-Muñoz
Organizations
- Defense Advanced Research Projects Agency
- National Institutes of Health