Optical phased arrays with evanescently-coupled antennas

Sun, Jie; Watts, Michael R; Yaacobi, Ami; Timurdogan, Erman

Optical phased arrays with evanescently-coupled antennas

Patent · Tue Mar 24 00:00:00 EDT 2015

OSTI ID:1174183

Sun, Jie; Watts, Michael R; Yaacobi, Ami; Timurdogan, Erman

An optical phased array formed of a large number of nanophotonic antenna elements can be used to project complex images into the far field. These nanophotonic phased arrays, including the nanophotonic antenna elements and waveguides, can be formed on a single chip of silicon using complementary metal-oxide-semiconductor (CMOS) processes. Directional couplers evanescently couple light from the waveguides to the nanophotonic antenna elements, which emit the light as beams with phases and amplitudes selected so that the emitted beams interfere in the far field to produce the desired pattern. In some cases, each antenna in the phased array may be optically coupled to a corresponding variable delay line, such as a thermo-optically tuned waveguide or a liquid-filled cell, which can be used to vary the phase of the antenna's output (and the resulting far-field interference pattern).

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Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC04-94AL85000

Assignee:: Massachusetts Institute of Technology (Cambridge, MA)

Patent Number(s):: 8,988,754

Application Number:: 14/149,099

OSTI ID:: 1174183

Country of Publication:: United States

Language:: English

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