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Proceedings Article

Developing metal mesh filters for mid-infrared astronomy of 25 to 40 micron

[+] Author Affiliations
Shigeyuki Sako, Takashi Miyata

Institute of Astronomy, The Univ. of Tokyo (Japan)

Tomohiko Nakamura

Institute of Astronomy, The Univ. of Tokyo (Japan) and The Univ. of Tokyo (Japan)

Takashi Onaka

The Univ. of Tokyo (Japan)

Yuji Ikeda

Photocoding (Japan)

Hirokazu Kataza

Japan Aerospace Exploration Agency (Japan)

Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 701853 (July 14, 2008); doi:10.1117/12.788510
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From Conference Volume 7018

  • Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
  • Eli Atad-Ettedgui; Dietrich Lemke
  • Marseille, France | June 23, 2008

abstract

We have developed bandpass filters for long mid-infrared astronomy in 25 to 40μm. Most of materials become opaque in wavelengths longer than 25μm. We have applied the metal mesh method to make filters of non-transparent materials. The mesh patterns are designed based on the FDTD calculations and fabricated by the photolithography method. Measured transmittances of the fabricated filters agree with model calculations. The mesh filter has leakage in wavelengths shorter than the peak wavelength in principle. The most effective way to achieve a high stopband rejection is to stack several identical mesh filters incoherently. A narrow bandwidth fitted to atmospheric windows is required in the ground-based 30μm observations. We have fabricated a thick mesh filter without dielectric substrate, which is main source of internal absorption. The thick mesh leads to narrowing of the bandwidth due to the waveguide effect. The fabricated non-coated thick mesh filter has a peak transmittance of 0.8 and a bandwidth of λ/dλ=8.3 at 4 K. When stacking four of these mesh filters, it is expected to achieve a stopband rejection over 50dB, a peak transmittance of 0.41, and a bandwidth of λ=/dλ=17.5.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Shigeyuki Sako ; Takashi Miyata ; Tomohiko Nakamura ; Takashi Onaka ; Yuji Ikeda, et al.
"Developing metal mesh filters for mid-infrared astronomy of 25 to 40 micron", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 701853 (July 14, 2008); doi:10.1117/12.788510; http://dx.doi.org/10.1117/12.788510


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