No abstract

An array of Ag-Ti-n-GaAs grating photodiodes was designed and fabricated, with each diode having an active area with a diameter of 400 microm. Both electrical and optical characterizations were performed. We have made two experimental observations concerning (1) the surface-plasma-enhanced detectivity as a function of wavelength for 30 degrees angle of incidence and (2) the offset in angle between the reflectivity minimum and the current maximum at the surface-plasma resonance.

No abstract

ARSTAACTA computer program is developed using the classical oscillator model of Hans W. Verleur [1] to study the transmittance and reflectance spectra of pre- and post radiation damaged optical components such as color glass filters, multilayer bandpass filters and band reject filters irradiated by one megárad gamma radiation from a 60Co source. In the classical oscillator model, the complex dielectric constant ε(ω) is represented as the sum of classical oscillators with oscillator strength Si, resonance frequency ωi, linewidth Γi and high frequency dielectric constant ε∞ which are the adjustable parameters to fit the experimental transmittance and reflectance data over a limited range of frequency. The parameters have physical significance in the lattice vibrational region. In the spectral regions corresponding to electronic transitions, the spectra can be fitted accurately with no physical meaning associated with the parameters. The present work has concentrated on the calculations of the optical constants n and k of the radiation damaged optical components to determine the effects of 60Co gamma radiation on the optical constants of both films and substrates in these components.

Laboratory tests were intended to show differences in processing and weatherability which occur when various powdered and liquid barium/cadmium stabilizers are used alone and in combination with epoxy plasticizer and phosphite. The results show that in the selection of stabilizers it is not necessarily the metal content of the stabilizer which is important, but rather that optimum weathering stability is achieved by the correct combination of complex barium, cadmium and zinc components. Liquid barium/cadmium/zinc compounds of the IRGASTAB BC 445 type, combined with epoxy plasticizer and phosphite, give optimum stabilization of plasticized PVC, ease of processing and excellent weatherability.