High-intensity interminiband terahertz emission from chirped superlattices

Ko¨hler, Ru¨deger; Tredicucci, Alessandro; Beltram, Fabio; Beere, Harvey E.; Linfield, Edmund H.; Giles Davies, A.; Ritchie, David A.
March 2002
Applied Physics Letters;3/18/2002, Vol. 80 Issue 11, p1867
Academic Journal
Electroluminescence at λ∼69 µm (4.3 THz) is reported from interminiband transitions in quantum-cascade structures with superlattice active regions. Spontaneous emission gives a low-temperature linewidth of 2 meV (0.48 THz) with linear light-current characteristics observed up to high-current densities (625 A/cm²), resulting in record output powers of 500 pW. Devices operate up to above liquid-nitrogen temperature, with both emission wavelength and currentvoltage characteristics in good agreement with theoretical predictions.


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