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Experimental setup and (inset) LD pump wavelength ranges with LD temperature variation. ASL—aspheric lenses; BS—beamsplitter cube; and PCA—photoconductive antenna.
Typical CW THz output power trends from a QD photomixer test device. (a) Monitored as the optical pump power is held constant and the PCA bias and accelerating E-field is increased; (b) as the PCA bias is held constant and the optical pump power is increased.
Example THz output power trend observed as the structure is optically pumped by a Ti:Sapphire laser, operating at 780 nm with a pulsewidth of 150fs. Initially, the square-law dependence of output power on optical pump power is observed, then the structure begins to exhibit THz output saturation characteristics.
PL spectrum from the QD-based structure showing the distinct ground state, excited state, and second-excited state PL peaks at around 1256 nm, 1189 nm, and 1111 nm, respectively.
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