We demonstrate enhanced electro-optic phase shifts in suspended InGaAs/InGaAsP quantum well waveguides compared to attached waveguides. The enhancement stems from an improved overlap between the optical mode and the multiple quantum well layers in thin waveguides when the semiconductor material beneath the waveguide is selectively etched. The measured voltage length product is 0.41 V-cm and the measured propagation loss is 2.3 +/- 0.7 dB/cm for the TE mode in the ...
The Optical Sciences Division, in collaboration with scientists from the Remote Sensing Division and the Naval Center for Space Technology, field-tested a free-space optical (FSO) link for a counter-IED (improvised explosive device) robot. Traditional radio frequency (RF) link command and control of these robots is not possible in the presence of IED RF jammer systems. To solve this problem, a freespace optical link using quantum well based modulating retroreflectors was ...
The ability to engineer the optical and electronic properties of epitaxially grown compound semiconductor heterostructures in the growth (vertical) direction has enabled the explosive growth and success of semiconductor lasers, photodetectors, and modulators. However, high-quality laterally patterned band structure in these materials has proven much more elusive. Materials with precise lateral band structure control are of particular importance for applications in integrated photonics and artificial quantum confined systems. In addition, ...
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