Source: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-3-2703
Timestamp: 2019-04-25 02:03:47+00:00

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A novel optical antenna for optical phased arrays is proposed and simulated. A high-contrast grating structure is used to achieve extremely efficient emission. The emission efficiency is as high as 93.94% at 1.55 μm, which exceeds 50% in a range of wavelength from 1.48 μm to 1.62 μm. The antenna can achieve a perfect grating lobe suppression with background suppression of 28.4 dB when the phase difference between adjacent waveguides is 0. A 16-wire optical phased array can easily achieve a scan range of ± 22.8° × 20.2° with a beam width of 2.4° × 2.5°, by employing the optical antenna proposed.
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Lumerical Solutions, Inc., http://www.lumerical.com/tcad-products/fdtd/ .
Fig. 1 Schematic of the HCG optical antenna for integrated LIDAR with optical phased arrays on SOI substrate.
Fig. 2 Field profile for light emitting from waveguide incidence to space.
Fig. 4 (a) Simulated far field radiation of the 16-wire HCG optical antenna, showing 22.8° radiation angle to the normal of the chip surface; (b) and (c) indicate the far field profile of 4 wires, 8 wires, 16 wires and 32 wires optical antenna in Ψ axis and θ axis, respectively. The maximum value of the simulation results is normalized.
Fig. 5 (a) and (b) indicate beam profiles at 1.55 μm wavelength as the beam was swept in the Ψ axis by changing the phase difference between adjacent waveguides Δφ from 0° to 360°; (c) The maximum scanning angle of the optical antenna in the Ψ axis when d = 0.5 μm, 1 μm, 1.5 μm and 2 μm; (d) Antenna emission efficiency when Δφ changes from 0° to 360° when d = 1.5um.
Fig. 6 Normalized optical output profile in the far field as the beam was swept in the θ axis by changing the wavelength from 1.48 μm to 1.62 μm.
(2) W − HCG=N( W − Wg+d) .

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