Abstract
A standing wave Fourier transform spectrometer is realized. The spectrometer consists of an ultra thin and partially transparent photodetector and a tunable mirror. The incident light forms a standing wave in front of the mirror, which is sampled by the ultra thin optical detector. The thickness of the photodetector is significantly smaller than the wavelength of the incident light. The spectral information of the incident light is determined by the Fourier transform of the detector signal. The linear arrangement of the optical detector and the mirror enables the realization of spectrometer arrays and optical cameras with high spectral resolution. For the first time a complete optical model of the standing wave spectrometer is presented and compared with experimental results. The influence of the design of the optical detector on the performance of the spectrometer is discussed.
Highlights
Helmut Stiebig Institute of Photovoltaics, Research Center Jülich, 52425 Jülich, Germany Dietmar Knippa Department of Engineering and Science, International University Bremen, 28759 Bremen, Germany
Research on microelectromechanical systems and integrated photonic technologies has lead to the development of several concepts and devices in the area of optical metrology
The intensity profile of the standing is sensed by a partially transmissive optical sensor. This approach has been used to realize standing-wave interferometers3,5 or Fourier spectrometers that operate in the near-infrared part of the optical spectrum
Summary
We will present an alternative approach to realize a standing-wave Fourier spectrometer that operates in the visible part of the optical spectrum. The active region of the sensor has to be much thinner than the wavelength of the light, so that the overall photocurrent follows the intensity pattern of the standing wave. We will discuss the influence of the partially transmissive sensor on the spectral resolution of the spectrometer.
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