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9 Feb 1998

Volume 72, Issue 6, pp. 627-747

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Schottky barrier photodetectors based on AlGaN

A. Osinsky, S. Gangopadhyay, B. W. Lim, M. Z. Anwar, M. A. Khan, D. V. Kuksenkov, and H. Temkin

Appl. Phys. Lett. 72, 742 (1998); http://dx.doi.org/10.1063/1.120862 (3 pages) | Cited 59 times

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We report solar-blind AlxGa1−xN photovoltaic detectors with cutoff wavelengths as short as 290 nm. Mesa geometry devices of different active areas are fabricated and characterized for spectral responsitivity, speed, and noise performance. The responsivity of the devices near the cutoff wavelength is 0.07 A/W. The detector noise is found to be 1/f limited, with a noise equivalent power of 6.6×10−9 W over the total response bandwidth of 100 kHz. © 1998 American Institute of Physics.
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73.61.Ey III-V semiconductors
85.60.Gz Photodetectors (including infrared and CCD detectors)
73.30.+y Surface double layers, Schottky barriers, and work functions
85.30.Hi Surface barrier, boundary, and point contact devices
72.70.+m Noise processes and phenomena

Millimeter-wave phase conjugation using artificial nonlinear surfaces

Yian Chang, Harold R. Fetterman, Irwin L. Newberg, and Steve K. Panaretos

Appl. Phys. Lett. 72, 745 (1998); http://dx.doi.org/10.1063/1.120863 (3 pages) | Cited 5 times

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An artificial nonlinear surface has been developed using antenna-coupled mixers with optical interconnects for microwave and millimeter-wave phase conjugation. Prototype one-dimensional arrays have been constructed and have been used to demonstrate two-dimensional free-space phase conjugation at 10.24 GHz. The phase conjugation properties have been observed and verified by directly measuring the electric-field distribution of the conjugate wave under various conditions. Furthermore, the experiments have shown amplified conjugate wave power up to ten times of that of the incoming wave. This amplifying ability demonstrates the potential of such surfaces to be used in novel communications applications. © 1998 American Institute of Physics.
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84.40.Ba Antennas: theory, components and accessories
42.79.Ta Optical computers, logic elements, interconnects, switches; neural networks
42.82.Ds Interconnects, including holographic interconnects
84.30.Qi Modulators and demodulators; discriminators, comparators, mixers, limiters, and compressors
42.65.Jx Beam trapping, self-focusing and defocusing; self-phase modulation
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