研究目的
Investigating photonic devices with wavelength tuning capabilities using liquid crystal microcells monolithically integrated onto the surfaces of photodiodes or VCSEL fabricated on InP based materials.
研究成果
The study demonstrates the feasibility of tuning the detected or emitted wavelength over a range of more than 70 nm for photodiodes and more than 20 nm for VCSELs using liquid crystal microcells. This approach offers a promising alternative to MEMS technologies for compact, dynamically reconfigurable wavelength sources and detectors.
研究不足
The spectral window is limited by the tuning range of the laser used in the experiments. The maximum applied LC voltage for VCSEL tuning is 20V, which may be a constraint for some applications.
1：Experimental Design and Method Selection:
The study investigates tunable photonic devices using liquid crystal microcells integrated onto photodiodes and VCSELs. The methodology includes the fabrication of LC-based Fabry-Perot filters above standard InGaAs PDs and the development of a new LC microcell fabrication process for thinner LC layers applied to VCSELs.
2：Sample Selection and Data Sources:
InGaAs PD arrays and InP-based VCSELs containing InGaAsP strained quantum-wells are used.
3：List of Experimental Equipment and Materials:
Includes tunable laser, SiO2/TiO2 Bragg reflector, SiNx/aSi Bragg reflector, SU-8 layer, and LC material.
4：Experimental Procedures and Operational Workflow:
Fabrication of empty microcells, bonding with DBRs, LC infiltration, and photocurrent measurements with a tunable laser.
5：Data Analysis Methods:
Photocurrent measurements as a function of voltage applied on the LC layer and analysis of laser emission spectra.
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