Thermally controlled Si photonic crystal waveguide slow light beam steering device

Takeuchi, Goro; Terada, Yosuke; Takeuchi, Moe; Abe, Hiroshi; Ito, Hiroyuki; Baba, Toshihiko

doi:10.1117/12.2289419

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…The former was governed by the photonic band-edge without heating, and the crosspoint of the SiO2 light line and the waveguide band shifted with heating; thus, it was slightly expanded by the heating, as compared with the -swept scanning. The calculation of the photonic band suggested that  = 0°-32° was possible [17], although the emission disappeared at  = 0°, as already mentioned, and the beam divergence and disordering increased gradually when  approached 0°. Therefore, we set  at 1.58 m, which was slightly shorter than the band-edge wavelength, and employed  = 10°-30° to obtain ′ = 0°-20°.…”

Section: Beam Scanningsupporting

confidence: 62%

“…If the response of the driver circuit is improved so that its onset time also becomes negligible, the frame-rate will be ˃ 15 fps. Regarding the device response, we previously measured f c ≈ 100 kHz in a similar pi-p-doped LSPCW [17], for which the onset time of 3.5 s and a frame-rate of > 20 fps were expected. In that experiment, the chip was not die-bonded and the electrical contact was conducted by a probe instead of the wire-bonding.…”

Section: Response Speedmentioning

confidence: 88%

“…In finite-difference time-domain simulations, such gratings exhibited an emission rate of 100 dB/cm and a 60% upward emission (40% downward), regardless of the direction of the light propagation. Further, LSPCW was p-i-p-doped to heat the undoped core selectively when the electric current flowed across the waveguide [17]. The target concentration of p-doping was 1.05  10 18 cm -3 .…”

Section: Devicementioning

confidence: 99%

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Thermo-Optic Beam Scanner Employing Silicon Photonic Crystal Slow-Light Waveguides

Tamanuki

Ito

Baba

2021

J. Lightwave Technol.

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Abstract-Optical beam scanning is a widely utilized function in optical systems, and a compact nonmechanical solid-state device has long been anticipated. Here, we have studied such a device consisting of photonic crystal slow-light waveguides and switch trees, fabricated by a Si photonics process, employing a bespoke prism lens for beam collimation. Further in this study, we particularly demonstrated the operation of the device only by the thermo-optic (TO) tuning of its components, at a fixed wavelength of light. A spot beam of ~0.1° divergence, was scanned in two dimensions, in the angular range of 40°  8.8° and average power consumption of ˂ 0.7 W. Neglecting some disordered beams caused by the non-uniformity of the fabricated device, the estimated number of resolution points was 400  32 = 12,800, which required a significant effort in the device fabrication and calibration, utilizing optical-phased arrays, if the same performance was targeted.

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Section: Beam Scanningsupporting

confidence: 62%

Section: Response Speedmentioning

confidence: 88%

Section: Devicementioning

confidence: 99%

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Thermo-Optic Beam Scanner Employing Silicon Photonic Crystal Slow-Light Waveguides

Tamanuki

Ito

Baba

2021

J. Lightwave Technol.

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“…The angle θ depends on the refractive index n Si of the Si layer as well as the wavelength [15]. The refractive index sensitivity is dθ/dn Si = (λ/n Si )(dθ/dλ) ≈90°/RIU from the wavelength sensitivity.…”

Section: Design and Fabricationmentioning

confidence: 99%

Wavelength-division multiplexing Si photonic crystal beam steering device for high-throughput parallel sensing

et al. 2018

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We proposed and demonstrated a wavelength-division multiplexing (WDM) optical beam-steering device consisting of a thermally controlled doubly periodic Si twodimensional bulk photonic crystal waveguide and coupled microring multiplexers. Beam forming and steering while maintaining a sharp profile is much easier in this device than with optical phased arrays which need the fine phase control. By dividing the range of beamsteering angles into different wavelength channels, it is possible to cover a wide range of angles, even when each angle is small. In this study, we fabricated a device with four wavelength channels, each of which showed beam steering of 4°-5° as a result of heating, resulting in a total of 16°. Two-dimensional steering is also achieved by loading a collimator lens and selecting one waveguide from those arrayed. We evaluated 112 resolution points with four wavelengths and 448 points in total by switching four waveguides. If this WDM concept is introduced into light detection and ranging and the number of wavelengths is increased, it will be possible to increase the sensing throughput, which is usually constrained by the round-trip time of light, by simultaneous parallel operation.

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“…Modulators and sensors use slow light PCWs for their high phase-velocity sensitivity to the refractive index of the waveguide or surrounding medium [7][8][9][10][11][12][13][14]. Recently, slow light PCWs were shown to be an effective basis for optical phased arrays (OPAs), providing improvements in their beam steering capabilities [15][16][17][18]. The wavelengthdependent steering sensitivity of the OPA depends on the dispersion relation of the waveguides that feed the OPA antennas.…”

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confidence: 99%

Inverse-Designed Photonic Crystal Circuits for Optical Beam Steering

et al. 2021

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The ability of photonic crystal waveguides (PCWs) to confine and slow down light makes them an ideal component to enhance the performance of various photonic devices, such as optical modulators or sensors. However, the integration of PCWs in photonic applications poses design challenges, most notably, engineering the PCW mode dispersion and creating efficient coupling devices. Here, we solve these challenges with photonic inverse design and experimentally demonstrate a slow-light PCW optical phased array (OPA) with a wide steering range. Even and odd mode PCWs are engineered for a group index of 25, over a bandwidth of 20 and 12 nm, respectively. Additionally, for both PCW designs, we create strip waveguide couplers and free-space vertical couplers. Finally, also relying on inverse design, the radiative losses of the PCW are engineered, allowing us to construct OPAs with a 20° steering range in a 20 nm bandwidth.

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Thermally controlled Si photonic crystal waveguide slow light beam steering device

Cited by 3 publications

References 6 publications

Thermo-Optic Beam Scanner Employing Silicon Photonic Crystal Slow-Light Waveguides

Thermo-Optic Beam Scanner Employing Silicon Photonic Crystal Slow-Light Waveguides

Wavelength-division multiplexing Si photonic crystal beam steering device for high-throughput parallel sensing

Inverse-Designed Photonic Crystal Circuits for Optical Beam Steering

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