研究目的
Investigating the selective terahertz emission due to electrically excited 2D plasmons in AlGaN/GaN heterostructure under conditions of two-dimensional electron heating by the lateral electric field.
研究成果
The study demonstrated significant selective amplification of THz radiation emission due to nonequilibrium 2D plasmons in AlGaN/GaN heterostructures with surface metal gratings. The emission frequency was controllable by the grating period, and the effective temperature of nonequilibrium 2D plasmons was close to the hot 2D electron temperature. These findings may contribute to the development of GaN-based electrically pumped terahertz emitters.
研究不足
The study is limited by the spectral range of the Ge:Ga detector and the resolution of the magnetic-field-tuned InSb filter. The wall-plug efficiency of the THz emitter is relatively low compared to quantum cascade lasers.
1：Experimental Design and Method Selection:
The study involved the design of AlGaN/GaN heterostructures with surface metal gratings to investigate terahertz emission under electrical excitation. Theoretical modeling of equilibrium transmission and absorption spectra was performed using a rigorous solution of Maxwell’s equations.
2：Sample Selection and Data Sources:
AlGaN/GaN heterostructures were grown by metalorganic chemical vapor deposition (MOCVD) on c-plane sapphire substrates. Samples with different grating periods were fabricated and characterized.
3：List of Experimental Equipment and Materials:
Fourier spectrometer Bruker Vertex 80v, Ge:Ga detector, n-InSb plate as a magnetic-field-tuned filter, superconducting solenoid, digital oscilloscope, and electron beam lithography for grating fabrication.
4：Experimental Procedures and Operational Workflow:
THz electroluminescence was studied under pulsed electric field excitation. The integrated intensity of THz radiation was detected, and spectral studies were conducted using a Ge:Ga detector and a magnetic-field-tuned InSb filter.
5：Data Analysis Methods:
The power balance equation was used to analyze I–V characteristics and determine the effective temperature of hot 2D electrons. The spectral radiation density was analyzed to identify 2D plasmon resonances.
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