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The introduction of an undoped (AlGa)As spacer enhances significantly the low‐temperature mobility in modulation‐doped GaAs‐(AlGa)As superlattices. Mobilities increase m o n o t o n i c a l l y with spacer thickness. This indicates that ionized impurity scattering can be further suppressed...
A new type of constricted double‐heterojunction large‐optical‐cavity (CDH‐LOC) laser is obtained by growing relatively thick (0.2–0.3 μm) convex‐lens‐shaped active layers above concave‐lens‐shaped guide layers. By using the effective‐index method it is shown that the...
700‐K H 2 S adsorption in the monolayer range onto the GaAs (100) surface induces profound modifications of surface properties. Al i n s i t u epitaxially deposited near room temperature by molecular beam epitaxy (MBE) on a H 2 S adsorbed semiconductor surface exhibits low‐effective...
We have measured the pressure dependence of the energy levels of the deep traps E 2, E 3, and E 4 produced by irradiation of GaAs with 1‐MeV electrons. All three traps have pressure coefficients which are an appreciable fraction of that of the direct gap, with values relative to the bottom of...
Electron paramagnetic resonance (EPR) spectroscopy has been performed using optoacoustic piezoceramic detection and photothermal infrared detection. Though the signal‐to‐noise ratio is lower than in conventional EPR detection at 100 kHz, it compares favorably at low modulation frequencies....
Periodic waveguides have been fabricated by diffusing silver ions into soda lime glass substrates through aluminium grating masks. An efficient beam splitter has been demonstrated. The technique is simple to implement and could be used to fabricate other efficient thin‐film devices.
We report very intense photoluminescence in spray‐pyrolyzed CdTe at 77 K. We also notice striking similarities in the luminescence spectra, decay, and temperature dependence between CdTe and other thin‐film semiconductors, which we interpret in terms of recombination at defect sites in...
A tandem photovoltaic cell has been fabricated using a thin‐film plastic electrolyte to connect in optical and electrical series an n ‐type CdS thin‐film and a p ‐type CdTe single crystal. The electrolyte was a thin film of poly(ethylene oxide) with a polysulfide redox couple. An open...
Coupled differential equations which include the effect of nonplanar beams and of nonuniform amplitude distributions are derived for the amplitudes of the four waves. The method is illustrated by two examples for the case when the pump beams are much stronger than the object and image beams.
We present the results of an investigation of thin‐film dc super conducting quantum interference device (SQUID’s) with very high energy resolution. The SQUID’s were fabricated using integrated‐circuit techniques appropriate for superconducting devices. A weakly coupled SQUID with very low...
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