Metasurface full-Stokes polarization camera (Conference Presentation)

Ehsan Arbabi; Seyedeh Mahsa Kamali; Amir Arbabi; Andrei Faraon

doi:10.1117/12.2510543

8 March 2019 Metasurface full-Stokes polarization camera (Conference Presentation)

Ehsan Arbabi, Seyedeh Mahsa Kamali, Amir Arbabi, Andrei Faraon

Proceedings Volume 10928, High Contrast Metastructures VIII; 109280H (2019) https://doi.org/10.1117/12.2510543
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Polarization is an important degree of freedom of light carrying information that is usually missing in other degrees of freedom. Polarimetric imaging is the process of measuring the state of polarization of light over an extended scene. It has several applications ranging from remote sensing to biological and medical imaging because it provides various pieces of information about the light source or the objects with which the light has interacted. So far polarization cameras have been made using polarization filters, and therefore suffer from two major drawbacks. First, there is a theoretical 50% upper limit on the efficiency of devices based on polarization filters. Second, to fully determine the state of polarization, multiple layers should be integrated in order to make polarization filters for circular or elliptical polarization states. Here, we present a polarization camera made using dielectric metasurfaces that operates based on separating and focusing orthogonal polarization states instead of polarization filtering. This allows for overcoming both drawbacks of current polarization camera designs. At the core of the design lies the capability of dielectric metasurfaces to fully control the polarization and phase of light. This enables designing and fabricating superpixels that separate and focus orthogonal polarization states of light on adjacent pixels on an image sensor over a single metasurface layer. Using this technique we have demonstrated full-Stokes polarization cameras with experimental efficiencies surpassing 60%, and superpixel dimensions reaching 4.8 µm×7.2 µm. We have also used this camera to form polarization images of custom-designed polarization targets.

Conference Presentation

Citation Download Citation

Ehsan Arbabi, Seyedeh Mahsa Kamali, Amir Arbabi, and Andrei Faraon "Metasurface full-Stokes polarization camera (Conference Presentation)", Proc. SPIE 10928, High Contrast Metastructures VIII, 109280H (8 March 2019); https://doi.org/10.1117/12.2510543

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KEYWORDS

Dielectric polarization

Cameras

Optical filters

Dielectric filters

Dielectrics

Image processing

Light sources

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