The grating light valve (GLV) technology is a micromechanical phase grating. By providing controlled diffraction of incident light, a GLV device will produce bright or dark pixels in a display system. With pulse width modulation, a GLV device will produce precise gray-scale or color variations. Built using micro electromechanical system technology, and designed to be manufactured using mainstream IC fabrication technology, the GLV device can be made both small and inexpensively. A variety of display systems can be built using GLV technology each benefiting form the high contrast ratio, fill ratio, and brightness of this technology. In addition, GLV technology can provide high resolution, low power consumption, and digital gray-scale and color reproduction.
We have developed all-electronic integrated circuits that generate and detect picosecond pulses. We have used these circuits with integrated antennas in a system capable of free-space spectroscopy in the terahertz (THz) regime. With this system, we have measured magnitude and phase transmission characteristics for a variety of samples in the 200 GHz - 1 THz frequency range.
We have developed all-electronic integrated circuits that generate and detect picosecond pulses. We have used these circuits with integrated antennas in a system capable of free- space spectroscopy in the THz regime. With this system, we have measured magnitude and phase transmission characteristics for a variety of samples in the 200 GHz - 1 THz frequency range.
Photodetectors play a fundamental role in optical communication and measurement systems. To date, the fastest reported photodiodes have bandwidths around 100 GHz. Because presently available oscilloscopes have bandwidths up to only 50 GHz, electro-optic sampling was used to measure their responses. The speed of the actual devices was indirectly determined by a deconvolution of the system response from the measured data. To overcome this measurement limitation, we have devised two new circuits that allow high-speed photodetectors to be used to measure laser pulses without using expensive sampling oscilloscopes or complex laser systems. The first is a high-speed Schottky photodiode monolithically integrated with an electronic sampler. With this circuit we were able to measure an impulse response of 1.8 ps FWHM corresponding to 3-dB bandwidth of 200 GHz. The second circuit is a high-speed photodiode monolithically integrated with a microwave detector. This second circuit can replace the wavelength-selective nonlinear crystal in autocorrelation and crosscorrelation setups. With this circuit, we were able to measure a 1.4 ps FWHM. The main advantage that the photodetector circuit has over the nonlinear crystal is that it is not wavelength specific.
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