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Journals and Conferences
We report a novel approach to the design of normal incidence multiple quantum well light modulators. The quantum confined Stark effect is utilized to tune the light polarization rotation and phase retardation created by a thermally induced in-plane anisotropic strain. An exceedingly high contrast ratio of 5000:1 is demonstrated for a normally-on device at… (More)
The flip chip bonding process is optimized by varying the bonding pressure, temperature, and time. The 68times68 mid wave infrared (MWIR) LED array was hybridized onto Si-CMOS driver array with same number of pixels. Each pixel has two indium bumps, one for cathode and another for anode. Both LED array and CMOS drivers have 15-mum-square Indium bump contact… (More)
A GaAs/AlGaAs-based photonic-crystal device with MEMS activated insertion/removal of defect posts into/from sub-micron photonic-crystal holes has been fabricated and investigated. This allows the device to actively create/remove point resonators or waveguides in the photonic-crystal membrane.
We present a novel device concept for a reconfigurable photonic integrated circuit (PIC) that can be reprogrammed for many different functionalities. We report on our preliminary design, modeling, and fabrication of a semiconductor based photonic bandgap nano-membrane device with MEMS activated waveguide which is the basic building block of the… (More)
We report on our efforts to develop a semiconductor based photonic bandgap device with MEMS features that is designed to reconfigure the photonic crystal structure into different types of waveguide devices such as switches, modulators, etc.
Using a one-dimensional gradual channel analysis, the authors derive an analytical expression for the gate-source capacitance of an unsaturated MESFET as a function of the applied drain and gate voltages. Experimental measurements of the dependence of the gate-source capacitance on drain voltage show good agreement with theory when the device is biased… (More)