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Recent advances in expanding the spectral range of MEMS Fabry-Pérot filters

: Ebermann, M.; Neumann, N.; Hiller, K.; Gittler, E.; Meinig, M.; Kurth, S.


Schenk, H. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
MOEMS and miniaturized systems IX : 25 - 27 January 2010, San Francisco, California, United States; at SPIE Photonics West
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7594)
ISBN: 978-0-8194-7990-7
Paper 75940V
Conference "MOEMS and Miniaturized Systems" <9, 2010, San Francisco/Calif.>
Photonics West Conference <2010, San Franciso/Calif.>
Fraunhofer ENAS ()

First results of a MEMS Fabry-Perot filter (FPF) for the spectral range of 8-11 ?m are presented. Broad bandwidth and a low phase dispersion could be achieved by using new dielectric materials with an enhanced refractive index contrast and relatively simple reflector designs with a low number of layers. Different designs of the Bragg reflectors and complete FPF devices have been developed and samples have been fabricated and tested. Especially tilting and in certain cases bowing of the reflectors lowers the finesse of the fabricated filters. The bandwidth of the FPF is in the range of 170- 250 nm and the peak transmittance has been determined to be up to 60 %. Simulation and measurements agree very well if the effect of the defective finesse is taken into considerations.