Coupled absorption filters for thermal detectors

Yuyan Wang, Benjamin J. Potter, Joseph J. Talghader

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


A resonant absorption cavity that couples long-wavelength infrared (LWIR) light into a movable plate has been demonstrated for thermal detectors, especially microbolometers. Each device is continuously tunable over 8.7–11.1 µm by using electrostatic actuation with voltages from 0 to 42 V. The width of the resonance is relatively broad, approximately 1.5 µm, to match the large widths of many spectral features in the LWIR. At an actuation voltage of 45 V, the device switches into a broadband mode with an absorption width of 2.83 µm. This latter mode is used to enhance sensitivity in low-light situations in which little spectral information is present.

Original languageEnglish (US)
Pages (from-to)1945-1947
Number of pages3
JournalOptics Letters
Issue number13
StatePublished - Jul 1 2006


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