Breaking FOV-Aperture Trade-Off With Multi-Mode Nano-Photonic Antennas

Fatemi, Reza; Khial, Parham P.; Khachaturian, Aroutin; Hajimiri, Ali

doi:10.1109/jstqe.2020.3026966

Cited by 12 publications

(8 citation statements)

References 44 publications

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“…In this work, grating couplers with a standard design are used, which have a radiation diagram with angular beamwidth of 5° × 9° (see Fig. 1(d) ), but several solutions to implement broad field-of-view optical antennas have been recently proposed 33 .…”

Section: Discussionmentioning

confidence: 99%

Separating arbitrary free-space beams with an integrated photonic processor

et al. 2022

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Free-space optics naturally offers multiple-channel communications and sensing exploitable in many applications. The different optical beams will, however, generally be overlapping at the receiver, and, especially with atmospheric turbulence or other scattering or aberrations, the arriving beam shapes may not even be known in advance. We show that such beams can be still separated in the optical domain, and simultaneously detected with negligible cross-talk, even if they share the same wavelength and polarization, and even with unknown arriving beam shapes. The kernel of the adaptive multibeam receiver presented in this work is a programmable integrated photonic processor that is coupled to free-space beams through a two-dimensional array of optical antennas. We demonstrate separation of beam pairs arriving from different directions, with overlapping spatial modes in the same direction, and even with mixing between the beams deliberately added in the path. With the circuit’s optical bandwidth of more than 40 nm, this approach offers an enabling technology for the evolution of FSO from single-beam to multibeam space-division multiplexed systems in a perturbed environment, which has been a game-changing transition in fiber-optic systems.

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Section: Discussionmentioning

confidence: 99%

Separating arbitrary free-space beams with an integrated photonic processor

et al. 2022

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“…To compare our antenna with the state-of-the-art designs, we note that in ref. 39 a dual-input antenna based on two waveguides placed on opposite sides of a surface grating was used to increase the beam width. While this approach implements a concept similar to the use of a Bragg reflector that we propose here, it adds the additional burden of having two inputs with a perfectly controlled phases to properly work.…”

Section: Discussionmentioning

confidence: 99%

Highly efficient ultra-broad beam silicon nanophotonic antenna based on near-field phase engineering

Khajavi

Melati

Cheben

et al. 2022

Sci Rep

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Optical antennas are a fundamental element in optical phased arrays (OPA) and free-space optical interconnects. An outstanding challenge in optical antenna design lies in achieving high radiation efficiency, ultra-compact footprint and broad radiation angle simultaneously, as required for dense 2D OPAs with a broad steering range. Here, we demonstrate a fundamentally new concept of a nanophotonic antenna based on near-field phase-engineering. By introducing a specific near-field phase factor in the Fraunhofer transformation, the far-field beam is widened beyond the diffraction limit for a given aperture size. We use transversally interleaved subwavelength grating nanostructures to control the near-field phase. A Bragg reflector is used at the end of the grating to increase both the efficiency and the far-field beam width. The antenna has a compact footprint of 3.1 µm × 1.75 µm and an ultra-broad far-field beam width of 52° and 62° in the longitudinal and transversal direction, respectively, while the radiation efficiency reaches 82% after incorporating a bottom reflector to further improve the directionality. This unprecedented design performance is achieved with a single-etch grating nanostructure in a 300-nm SOI platform.

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“…Therefore, we finally chose to optimize the design of the edge-etched corrugated antenna structure. In addition, considering the reciprocity of the antenna [14], the higher the far-field emission efficiency is, the higher the receiving efficiency is under the same conditions. Therefore, we added the T-shaped etching structure of the antenna teeth, which further increases the energy diffracted by the antenna into the free space.…”

Section: Design and Analysismentioning

confidence: 99%

Two-Dimensional High-Efficiency Transceiver Integrated Optical Phased Array With Dual-Port Antenna

2022

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We propose a 1 × 32 silicon photonics transceiver integrated optical phased array (OPA) with a large scanning angle. It can process receive and transmit signals simultaneously, which effectively increases the on-chip signal transmission efficiency. The simulation shows that the phase-tuned 62.2°lateral beam steering without grating lobe and the wavelength-tuned 31.2°longitudinal beam steering can be achieved in the transmitting mode, and the overall optical loss is less than 9.1 dB. In the receiving mode, the combination of the two detection methods reduces the complexity of the system while ensuring the sensitivity of the system. According to statistics, an effective collection area of 43.3% per unit area can be achieved in the receiving mode, which provides a reliable guarantee for subsequent high-quality signal processing.

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Breaking FOV-Aperture Trade-Off With Multi-Mode Nano-Photonic Antennas

Cited by 12 publications

References 44 publications

Separating arbitrary free-space beams with an integrated photonic processor

Separating arbitrary free-space beams with an integrated photonic processor

Highly efficient ultra-broad beam silicon nanophotonic antenna based on near-field phase engineering

Two-Dimensional High-Efficiency Transceiver Integrated Optical Phased Array With Dual-Port Antenna

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