研究目的
Investigating the enhancement of effective nonlinear-index coefficient from the combination of radiation pressure and electrostriction in an air-cladding silicon pedestal waveguide.
研究成果
An enhancement of effective nonlinear-index coefficient from the combination of radiation pressure and electrostriction in an air-cladding pedestal waveguide was reported. By engineering the pillar width of the waveguide, about 27.6% enhancement in the effective nonlinear-index coefficient can be achieved for optical pulses with durations longer than the acoustic wave transit time.
研究不足
The enhancement of the nonlinear-index coefficient is less when the optical pulses are shorter than the time needed for acoustic waves to travel across the waveguide (~59ps).
1：Experimental Design and Method Selection:
The study involved designing and fabricating silicon pedestal waveguides with locally removed buried oxide (BOX) to support the waveguide. The nonlinear-index coefficient was measured by characterizing spectral broadening with incident pulses.
2：Sample Selection and Data Sources:
Samples included a conventional silicon waveguide (Sample A) and two silicon pedestal waveguides with different etching times (Sample B and Sample C).
3：List of Experimental Equipment and Materials:
A commercial silicon-on-insulator (SOI) wafer, hydrofluoric acid (HF) solution for etching, gain-switched distributed-feedback laser, erbium-doped fiber amplifier, bandpass filter, variable optical attenuator.
4：Experimental Procedures and Operational Workflow:
The BOX under the SOI waveguides was locally etched to create pedestal structures. Spectral broadening of optical pulses was characterized in the samples to measure the effective nonlinear-index coefficient.
5：Data Analysis Methods:
The effective nonlinear-index coefficient was derived from the phase shift of pulses, using the Kramers-Kronig relations to calculate the change in refractive index from the predicted change in absorption from stimulated Brillouin scattering.
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