Time-Varying Metasurfaces

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The inception of optical metasurfaces has enabled the development of planar optical devices such as planar lenses. Optical metasurfaces have been used to implement numerous planar devices including light bending and planar lenses. All these metasurfaces are based on phase discontinuity, which is spatially varying along the metasurface, and this variant phase allows for several functionalities that were only previously available via bulky curved structures. However, the strength of metasurfaces with time-variant phase modality remains unexplored, creating a need for more improvements in the field.

Researchers at Purdue University have developed a time-varying, optical metasurface technology to obtain a new class of planar optical devices, which includes tunable versions of planar devices obtained by space variant metasurfaces. The impact of time-varying metasurfaces exceeds tunable devices and new physical effects are obtained. Time-varying metasurfaces exhibit a more universal form of Snell's relation not limited by Lorentz reciprocity, enabling the building of magnetic-free optical isolators. In addition, these metasurfaces allow for wavelength modulation, which can be utilized to build frequency or phase modulators, or they can be used to control energy eigenstates of single photons in quantum experiments

-Time-variant phase modality
-Enables magnetic-free optical isolators
-Wavelength modulation

Potential Applications:
-Tunable planar lenses
-Optical communications
-Laser cooling
Jul 13, 2016
Utility Patent
United States

Jul 13, 2015
United States
Purdue Office of Technology Commercialization
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