研究目的
To design and fabricate a chip-scale optical phased array (OPA) with a uniform emitting structure composed of bent waveguides for aliasing-free beam-steering with a plateau envelope.
研究成果
The fabricated device demonstrates aliasing-free beam-steering with a plateau envelope, achieving a steering range of -34°~34°, FWHM of 6.71°, intensity fluctuation less than 0.45 dB, and side-lobe suppression greater than 9.37 dB. This provides a new design freedom by incorporating a cavity at the end of waveguide emitters.
研究不足
The paper does not explicitly state limitations, but potential areas for optimization could include further reduction of coupling and reflection effects, and scalability to larger arrays.
1：Experimental Design and Method Selection:
The design involves a dispersion-engineered bent waveguide array (BWA) with uniform spaced emitters of different radii for coupling suppression, and a 1-μm-long silica cavity for envelope tailoring. Numerical simulations were used to predict performance.
2：Sample Selection and Data Sources:
A 16-channel optical phased array was fabricated on a silicon-on-insulator platform, with specific design parameters such as a 0.8 μm pitch.
3：8 μm pitch.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Silicon-on-insulator wafers, bent waveguides, thermo-optic phase shifters, broad-band cascaded power splitters, grating coupler input, and a calibrated Fourier imaging system for phase alignment.
4：Experimental Procedures and Operational Workflow:
The phase alignment was conducted using a calibrated Fourier imaging system with optimization methods for automated trimming of voltages applied to TO phase shifters. Far-field patterns were measured at multiple steering angles.
5：Data Analysis Methods:
Far-field intensity patterns were analyzed to determine full-width at half-maximum (FWHM), energy concentration, side-lobe suppression ratio, and intensity fluctuation.
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