Spectrophotometer utilizing a solid state source of radiant ener

Details Spectrophotometer utilizing a solid state source of radiant ener Spectrophotometer utilizing a solid state source of radiant ener

1977-09-30

1979-08-14

Corbin, John K.

Optics: measuring and testing

By shade or color

250226, 313499, G01J 310, G01J 312

Patent

active

041643747

ABSTRACT:
A solid state source of radiant energy having a characteristic frequency spectra with a high frequency cutoff .nu..sub.co, which is a function of the applied voltage value. The source is a metal-insulator-metal tunnel junction wherein the insulator layer is relatively thin with respect to the metal layers and inelastic tunneling occurs. To facilitate output coupling to surface plasmon modes in the junction, the counter-electrode metal layer, from which the radiant energy is emitted, is roughened. One of the uses for the solid state source is as a light source of a spectrophotometer where the transmittance or reflectance band characteristics of a sample are determined by converting the photodetector current to its second derivative and correlating the second derivative with the applied voltage which is modulated over a predetermined range of amplitude values.

REFERENCES:
patent: 3056073 (1962-09-01), Mead
patent: 3405374 (1968-10-01), Dayem et al.
patent: 3588253 (1971-06-01), Wittmann
T. L. Hwang et al., "Plasma Radiation from Tunnel Junctions," Physical Review Letters, vol. 36, No. 7, Feb. 16, 1976, pp. 379-382.
W. Pong et al., "Electroluminescence in Al-Al.sub.2 O.sub.3 -Au Diodes," Journal of Applied Physics, vol. 46, No. 5, May 1975, pp. 2310-2312.
J. F. Delord et al., "Correlation between Electroluminescence and Electron Emission of Thin Metal-Oxide-Metal Sandwiches", Applied Physics Letters, vol. 11, No. 9, Nov. 1, 1967, pp. 287-289.
H. Kanter, "Comments on Correlation between Electroluminescence and Electron Emission of Thin Metal-Oxide-Metal Sandwiches", Applied Physics Letters, vol. 12, No. 8, Apr. 15, 1968, pp. 243-244.
Ilambe et al., "Light Emissions from Inelastic Electron Tunneling", Physical Review Letters, vol. 37, No. 14, Oct. 4, 1976, pp. 923-925.
T. W. Hickmott, "Electron Emission Electroluminescence and Voltage Controlled Negative Resistance in Al-Al.sub.2 O.sub.3 -Au Diodes," Journal of Applied Physics, vol. 36, No. 6, Jun. 1965, pp. 1885-1896.

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