High-resolution aliasing-free optical beam steering

Hutchison, David; Sun, Jie; Doylend, J. K.; Kumar, Ranjeet; Heck, John; Kim, Woo-Sung; Phare, Christopher T.; Feshali, Avi; Rong, Haisheng

doi:10.1364/optica.3.000887

Cited by 459 publications

(217 citation statements)

References 20 publications

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“…Owing to the complementary metal‐oxide semiconductor (CMOS) compatibility, silicon‐based photonic integrated circuits have shown huge potentials for optical interconnects in the power‐hungry high‐performance computers and data centers. Recently, growing efforts have been directed toward a series of emerging applications in field‐programmable gate arrays, artificial intelligence, quantum optics, optical processor, optical phased array, and so forth. Phase shifter is one of the fundamental building blocks for its diverse variety of functionalities including modulation, wavelength detuning, beam steering, etc.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Silicon Photonic Microheater Based on Black Arsenic–Phosphorus

Liu

Wang

et al. 2020

Advanced Optical Materials

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While black phosphorus has shown excellent optoelectronic properties in many aspects, the environmental instability ultimately places limits on its practical applications. Black arsenic–phosphorus (b‐AsP), an alloy of black phosphorus with arsenic atoms, has emerged as a new 2D material with better stability. Recently, the heterostructure via integration of 2D material with nanophotonic waveguides is opening an avenue for many on‐chip applications of phosphorene. However, the thermo‐optic (TO) properties, which are widely used for waveguide heaters, are not studied on b‐AsP yet. Herein, the TO effects of a b‐AsP/silicon van der Waals heterostructure are first investigated and its application as a transparent waveguide heater is demonstrated. A high efficiency of 0.74 nm mW−1 is achieved with a nonresonant and broadband heater based on 20 nm thick b‐AsP, which eliminates the need for enhancement by cavity‐assisted light–matter interaction, and thus allows for compact footprint, broadband operation, and low latency.

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Section: Introductionmentioning

confidence: 99%

Highly Efficient Silicon Photonic Microheater Based on Black Arsenic–Phosphorus

Liu

Wang

et al. 2020

Advanced Optical Materials

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“…Grating waveguides (GWGs) and optical phased arrays have attracted attention as optical antennas toward next era high-speed optical wireless communication and other advanced applications such as light detection and ranging [1,2,3,4,5]. The GWGs are a type of optical leaky waveguide antennas (OLWAs), which gradually radiate a guided mode to free space by the refractive index perturbation of the periodic linear grating.…”

Section: Introductionmentioning

confidence: 99%

Plane wave excitation by taper array for optical leaky waveguide antenna

Hara

Baba

Arai

2018

IEICE Electron. Express

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This paper proposes and demonstrates a plane-wave generator which consists of a compact taper array and expands the aperture of the grating waveguide (GWG) of optical leaky wave antenna, resulting in a high antenna gain. The device size is reduced to half of a conventional slow taper without degrading the aperture efficiency. We confirm the well correspondence of the antenna gain between the full numerical simulation and the estimation using measured parameters for the device fabricated by silicon photonics.

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“…Optical phased arrays to date, despite ever-increasing array size and element count 6,11 , remain limited in beam quality and steering angle because of unwanted coupling between dielectric waveguides, which forces radiating emitters to be placed several microns apart. Emitter spacing greater than half a wavelength steals optical power from the main beam, redirecting it into unwanted periodic grating lobes tens of degrees away that limit the uniquely addressable steering range of the array.…”

mentioning

confidence: 99%

Silicon Optical Phased Array with Grating Lobe-Free Beam Formation Over 180 Degree Field of View

Phare

Shin

Sharma

et al. 2018

Conference on Lasers and Electro-Optics

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Chip-scale optical phased arrays 1-15 could enable compact beam steering and LIDAR for autonomous vehicles, precision robotics, and free-space optical communications. Because these applications demand wide angle beam steering as well as high optical power in the output beam, a natural design choice would be to space the array emitters at a half-wavelength pitch, as is common in radiofrequency phased arrays. Optical phased arrays, however, unlike RF phased arrays, have been limited by the tradeoff between field of view (i.e. angle steering) and beamforming efficiency (i.e. optical power in the output beam). This tradeoff exists because optical phased arrays rely on waveguides as emitters, which suffer from strong crosstalk when placed in close proximity relative to their mode size. Here we overcome these limitations and demonstrate a platform for optical phased arrays with 180° field of view, where more than 72 percent of the power is carried in a single diffraction-limited beam even when steered up to 60° off-axis. Our platform leverages high index-contrast, dispersion-engineered waveguides spaced one half-wavelength apart without incurring crosstalk.Optical phased arrays to date, despite ever-increasing array size and element count 6,11 , remain limited in beam quality and steering angle because of unwanted coupling between dielectric waveguides, which forces radiating emitters to be placed several microns apart. Emitter spacing greater than half a wavelength steals optical power from the main beam, redirecting it into

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High-resolution aliasing-free optical beam steering

Cited by 459 publications

References 20 publications

Highly Efficient Silicon Photonic Microheater Based on Black Arsenic–Phosphorus

Highly Efficient Silicon Photonic Microheater Based on Black Arsenic–Phosphorus

Plane wave excitation by taper array for optical leaky waveguide antenna

Silicon Optical Phased Array with Grating Lobe-Free Beam Formation Over 180 Degree Field of View

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