Nanophotonic projection system

Aflatouni, Firooz; Abiri, Behrooz; Rekhi, Angad; Hajimiri, Ali

doi:10.1364/oe.23.021012

Cited by 158 publications

(57 citation statements)

References 15 publications

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“…In Ref. [22], a 4 × 4 array was realized using diode-based phase tuners, making use of carrier injection. In comparison to the thermo-optic effect, this electro-optic effect is very fast, leading to tuning bandwidths of 200 MHz.…”

Section: Optical Phased Arrays With Individually Tunable Emittersmentioning

confidence: 99%

Highly integrated optical phased arrays: photonic integrated circuits for optical beam shaping and beam steering

2016

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Abstract:Technologies for efficient generation and fast scanning of narrow free-space laser beams find major applications in three-dimensional (3D) imaging and mapping, like Lidar for remote sensing and navigation, and secure free-space optical communications. The ultimate goal for such a system is to reduce its size, weight, and power consumption, so that it can be mounted on, e.g. drones and autonomous cars. Moreover, beam scanning should ideally be done at video frame rates, something that is beyond the capabilities of current opto-mechanical systems. Photonic integrated circuit (PIC) technology holds the promise of achieving low-cost, compact, robust and energy-efficient complex optical systems. PICs integrate, for example, lasers, modulators, detectors, and filters on a single piece of semiconductor, typically silicon or indium phosphide, much like electronic integrated circuits. This technology is maturing fast, driven by highbandwidth communications applications, and mature fabrication facilities. State-of-the-art commercial PICs integrate hundreds of elements, and the integration of thousands of elements has been shown in the laboratory. Over the last few years, there has been a considerable research effort to integrate beam steering systems on a PIC, and various beam steering demonstrators based on optical phased arrays have been realized. Arrays of up to thousands of coherent emitters, including their phase and amplitude control, have been integrated, and various applications have been explored. In this review paper, I will present an overview of the state of the art of this technology and its opportunities, illustrated by recent breakthroughs.

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Section: Optical Phased Arrays With Individually Tunable Emittersmentioning

confidence: 99%

Highly integrated optical phased arrays: photonic integrated circuits for optical beam shaping and beam steering

2016

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“…Recently, OPA transmitters (TX) capable of electrical adaptive beamforming, forming a beam of light and steering it electronically, have attracted a great deal of interest [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. An OPA transmitter consists of an array of radiating elements and can be used to engineer a desired optical wavefront.…”

Section: Introductionmentioning

confidence: 99%

“…An OPA transmitter consists of an array of radiating elements and can be used to engineer a desired optical wavefront. Such an optical transmitter has applications in systems such as LiDAR [28][29][30][31][32], point-to-point communication [26,27,33], lens-less projection [19], and holographic displays [34]. Large-scale OPA transmitters with more than a thousand radiating elements have been demonstrated with narrow beamwidth and high resolution [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

High sensitivity active flat optics optical phased array receiver with a two-dimensional aperture

Fatemi¹,

Abiri²,

Khachaturian³

et al. 2018

Opt. Express

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Optical phased arrays (OPAs) on integrated photonic platforms provide a lowcost chip-scale solution for many applications. Despite the numerous demonstrations of OPA transmitters, the realization of a functional OPA receiver presents a challenge due to the low received signal level in the presence of noise and interference that necessitates high sensitivity of the receiver. In this paper, an integrated receiver system is presented that is capable of on-chip adaptive manipulation and processing of the captured waveform. The receiver includes an optoelectronic mixer that down-converts optical signals to radio frequencies while maintaining their phase and amplitude information. The optoelectronic mixer also provides conversion gain that enhances the system sensitivity and its robustness to noise and interference. Using this system, the first OPA receiver with a two-dimensional aperture of 8-by-8 receiving elements is demonstrated which can selectively receive light from 64 different angles. The OPA receiver can form reception beams with a beamwidth of 0.75 • over an 8 • grating-lobe-free field of view.

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“…To improve their radiation properties, power efficiency, and flexibility, significant effort has been dedicated to the development of optical antenna arrays in similar fashion to their radio-frequency counterparts [6][7][8][9][10][11][12][13][14]. Such approach enables a significant increase in overall directivity as well as dynamic control of the radiation pattern by tailoring both the amplitude and phase of each antenna element feeding [15][16][17]. This flexibility emerges as a significant feature in smart antennas required in future free-space communications [18].…”

Section: Introductionmentioning

confidence: 99%

Side-lobe level reduction in bio-inspired optical phased-array antennas

et al. 2017

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Phased arrays are expected to play a critical role in visible and infrared wireless systems. Their improved performance compared to single element antennas finds uses in communications, imaging, and sensing. However, fabrication of photonic antennas and their feeding network require long element separation, leading to the appearance of secondary radiation lobes and, consequently, crosstalk and interference. In this work, we experimentally show that by arranging the elements according to the Fermat's spiral, the side lobe level (SLL) can be reduced. This reduction is proved in a CMOS-compatible 8-element array, revealing a SLL decrement of 0.9 dB. Arrays with larger numbers of elements and inter-element spacing are demonstrated through an spatial light modulator (SLM) and an SLL drop of 6.9 dB is measured for a 64-element array. The reduced SLL, consequently, makes the proposed approach a promising candidate for applications in which antenna gain, power loss, or information security are key requirements.

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Nanophotonic projection system

Cited by 158 publications

References 15 publications

Highly integrated optical phased arrays: photonic integrated circuits for optical beam shaping and beam steering

Highly integrated optical phased arrays: photonic integrated circuits for optical beam shaping and beam steering

High sensitivity active flat optics optical phased array receiver with a two-dimensional aperture

Side-lobe level reduction in bio-inspired optical phased-array antennas

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