Accession Number : AD0849146

Title :   Microwave Radiation from Very Short Samples of Indium Antimonide.

Descriptive Note : Interim technical rept.,

Corporate Author : CORNELL UNIV ITHACA NY SCHOOL OF ELECTRICAL ENGINEERING

Personal Author(s) : Stark, Lawrence Alan

Report Date : FEB 1969

Pagination or Media Count : 64

Abstract : The pulsed d-c and microwave properties of very short samples of n-type indium antimonide (InSb) were studied. Efforts to fabricate non-injecting ohmic contacts were unsuccessful, and the sample current rose sharply at an average electric field substantially lower than that reported in the literature. The samples were tested in a double-slug coaxial resonator, and broadband, noisy signals were emitted when mutually perpendicular electric and magnetic fields were applied. The threshold conditions for these oscillations were about 250 volts/cm and 1.5 kilogauss. Coherent oscillations were seen to be present between 0.5 and 1 GHz at the beginning of each pulse. The frequency of these oscillations was not a clear function of the bias conditions or sample length although a higher magnetic field seemed to result in a higher frequency. Using a slotted line technique, the r-f impedance of the samples was measured. (Author)

Descriptors :   *MICROWAVE OSCILLATORS), (*INDIUM ANTIMONIDES, FIELD EMISSION, COHERENT RADIATION, CRYOGENICS, SEMICONDUCTOR DIODES, STABILITY, SOLID STATE PHYSICS.

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE