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Fourier-transform photocurrent spectroscopy using a supercontinuum light source

: Petermann, Christian; Beigang, René; Fischer, Peer


Applied Physics Letters 100 (2012), Nr.6, Art. 061108, 3 S.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
ISSN: 1931-9401 (online)
Fraunhofer IPM ()
Fourier transform spectroscopy; optical modulation; photoconductivity; photoelectron spectra; supercontinuum generation

We demonstrate an implementation of frequency-encoded photocurrent spectroscopy using a super-continuum light source. The spectrally broad light is spatially dispersed and modulated with a special mechanical chopper design that permits a continuous wavelength-dependent modulation. After recombination, the light beam contains a frequency encoded spectrum which enables us to map the spectral response of a given sample in 60ms and with a lateral resolution of 10µm.