研究目的
Investigating the bias current and temperature dependence of polarization dynamics in spin-lasers with electrically tunable birefringence to optimize energy-efficient operation.
研究成果
The study demonstrates the potential of spin-VCSELs for ultrafast and ultra-low power operation for optical data communication, even without temperature controlling mechanisms. Fast polarization dynamics with good signal strength can be obtained even for close-to-threshold operation and at high temperatures.
研究不足
The study is limited by the electrical tuning mechanism to control the birefringence in the investigated device, restricting the frequency range up to 36 GHz. The need for an electrical spin injection mechanism for practical applications is not yet available for VCSELs at room temperature.
1：Experimental Design and Method Selection:
The study utilizes a custom 850 nm VCSEL with electrically tunable cavity birefringence and temperature. The influence of bias current on polarization dynamics is investigated over a range of birefringence values.
2：Sample Selection and Data Sources:
The VCSEL device is driven with a pumping current starting at the threshold current and going up to its maximum rating, repeated for each value of the birefringence tuning current.
3：List of Experimental Equipment and Materials:
A Stokes polarimeter setup comprising a rotating quarter-wave retarder and a fixed linear polarizer is used to measure the Stokes parameters.
4：Experimental Procedures and Operational Workflow:
The VCSEL is driven with a hybrid pumping scheme, consisting of a spin-unpolarized electrical bias pumping and an optical pumping with Ti:sapphire laser pulses. The dynamics are analyzed with the Stokes polarimeter and a streak camera.
5：Data Analysis Methods:
The polarization dynamics are analyzed through the Stokes parameters and fast Fourier transform (FFT) of the circular polarization degree signal.
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