Design and fabrication of optical thin films for remote sensing instruments

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Journal of Vacuum Science and Technology. A, International Journal Devoted to Vacuum, Surfaces, and Films

DOI:https://doi.org/10.1116/1.3453700· OSTI ID:22051135

Hsiao, C N; Chen, H P; Chiu, P K; Cho, W H; Lin, Y W; Chen, F Z; Tsai, D P ^[1]

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1. Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu 300, Taiwan (China)

Optical thin films designed for multispectral band-pass filters and a primary Ag mirror were deposited on radiation-resistant glass by ion-beam-assisted deposition. The filters and mirror are for use in the optical payload of a remote sensing instrument. The optical parameters of the films and mirror were optimized by using admittance loci analysis. The simulation shows that the band-pass filters can achieve average transmittances of 95% in the blue (B1), green (B2), red (B3), near-infrared (B4), and panchromatic (400-900 nm) spectral ranges and an average reflectance of 99% for the primary Ag mirror in the visible spectrum. The corresponding properties of the films were investigated by in situ optical monitoring, spectrometry, and high-resolution transmission electron microscopy. It was found that the average transmittances are above 85% for all five band-pass filters, with a rejection transmittance below 1% in the spectral range of 350-1100 nm. The average reflectance of the primary Ag mirror (with a protective coating) is above 98%. Interference coatings were added to the basic protected silver design to enhance the reflectance in the visible spectral range. Furthermore, to investigate the optical stability of optical thin films for aerospace applications, a space environment was simulated by using a Co{sup 60} gamma ({gamma}) radiation source (total doses of 35 krad and 1 Mrad). The experimental results indicate that both the dielectric thin film stacks and radiation-protected glass are resistant to {gamma} radiation in the simulated space environment.

• OSTI ID: 22051135
• Journal Information: Journal of Vacuum Science and Technology. A, International Journal Devoted to Vacuum, Surfaces, and Films, Vol. 28, Issue 4; Other Information: (c) 2010 American Vacuum Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1553-1813
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
36 MATERIALS SCIENCE
COATINGS
COBALT 60
DESIGN
FILTERS
GAMMA RADIATION
GLASS
INTERFERENCE
ION BEAMS
MIRRORS
MONITORING
RADIATION DOSES
REMOTE SENSING
RESOLUTION
SILVER
SIMULATION
SPECTROSCOPY
THIN FILMS
TRANSMISSION ELECTRON MICROSCOPY
VISIBLE SPECTRA