科研之友
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摘要
We report on a novel optical system for discrete selection of precise, user-defined spectral regions from the emitted spectrum of a white light source. The device, which is based on an array of electrostatically actuated, achromatic micro-mirrors, allows us to select signals with spectral widths between 4 and 15 nm from the super-continuum (similar to 400 to similar to 750 nm), with an extinction ratio of more than 90% and a spectral power density of 15 mu W nm(-1). Each optical MEMS element from the array can be switched asynchronously at a selected frequency performing both the spatial selection and the frequency modulation of a specific narrow spectral region. The method we describe allows the spectral and/or temporal and polarization encoding of the selected spectral bands and may find extensive applications in biomedical research.
- 出版日期2008-6
