From Exciton Resonance to Frequency Mixing in GaAs Multiple Quantum Wells

Abstract

Frequency mixing (2v 1 2 v 2 ) is demonstrated in femtosecond nondegenerate four-wave mixing (FWM) on GaAs multiple quantum wells using two synchronized, independently tunable lasers. The frequency mixing component in the spectrally resolved FWM coexists with the exciton resonance, and it dominates over the exciton component at high intensity and high detuning. This off-resonant component is present only for delays smaller than the temporal pulse width, whereas the resonant exciton component survives for longer delays. [S0031-9007(99)09078-X]

Variation of the Thickness and Number of Wells in the CdS/HgS/CdS Quantum Dot Quantum Well System

“…In recent years, an increasing interest in semiconductor quantum well structures has led to the formation of physically and chemically prepared quantum well systems. [1][2][3][4][5][6][7] Multiplelayered quantum wells are meanwhile used to build solid-state optoelectronic devices. [8][9][10] The first chemically prepared quantum well system was synthesized in the CdS quantum dot.…”

“…In recent years, an increasing interest in semiconductor quantum well structures has led to the formation of physically and chemically prepared quantum well systems. − Multiple-layered quantum wells are meanwhile used to build solid-state optoelectronic devices. − The first chemically prepared quantum well system was synthesized in the CdS quantum dot. , Since its preparation, this quantum dot quantum well (QDQW) system has attracted much attention, both experimentally − and theoretically. − …”

Pt/3C-SiC electrothermal cantilever for MEMS-based mixers

“…Filtering is required to reject the images produced after mixing. However, with the MEMS-based frequency mixers, no filtering is required as the resultant frequency after mixing is the resonance frequency of the micromechanical device (Ahn et al 1999;Globespanvirata et al 2004). For example, signals applied to the electrodes of an electrothermal or electrostatic actuated resonator are multiplied and the difference or the sum of the two frequencies drives the resonator into resonance.…”