研究目的
To achieve wideband frequency tuning in terahertz quantum cascade lasers using a defect engineered photonic lattice in a coupled-cavity configuration.
研究成果
The study demonstrated wideband frequency tuning over 209 GHz, including mode-hop-free continuous tuning of ~6–21 GHz across six frequency bands, in a terahertz quantum cascade laser using a defect engineered photonic lattice in a coupled-cavity configuration. This represents a significant advancement in the field of terahertz optoelectronics, offering a compact and electrically controlled tuning mechanism.
研究不足
The frequency tuning is not controlled as a function of monotonic change of a single tuning parameter, requiring a look-up table for programmable tuning. The changes in drive currents also result in a change in output power, which could be mitigated by integrating an optical amplifier.
1：Experimental Design and Method Selection:
The study involved designing a coupled-cavity terahertz quantum cascade laser (QCL) with a defect engineered photonic lattice on one cavity to control the free spectral range and finesse.
2：Sample Selection and Data Sources:
A terahertz QCL based on GaAs/Al
3：18Ga82As material system was used. List of Experimental Equipment and Materials:
The fabrication involved molecular beam epitaxy, focused ion beam milling for patterning, and a Janis ST-100 continuous flow helium-cooled cryostat for characterization.
4：Experimental Procedures and Operational Workflow:
The QCL was characterized by varying drive current amplitudes and pulse widths, and spectra were acquired using a Bruker Fourier transform infra-red spectrometer.
5：Data Analysis Methods:
The transmission characteristics were modeled using transfer matrices, and the Stark shift of the gain was calculated from the electric field applied across the QCL.
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