Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 93: Plasmonics & Nanooptics VI: Near-Field Microscopy and Phenomena
O 93.6: Talk
Friday, April 5, 2019, 11:45–12:00, H8
Comparison of two approaches to near field spectroscopy on a Sb2S3 film — •Jinxin Zhan1, Jens Brauer1, Wei Wang2, Lukas Schmidt-Mende2, Petra Groß1, and Christoph Lienau1 — 1Ammerländer Heerstr. 114-118, Oldenburg — 2Universitätsstr. 10, 78457 Konstanz
Fundamental understanding of structure and function of nanomaterials is of great significance for investigating their optical and electric properties, and for further applications in corresponding fields. Optical spectroscopy on a nanometer length scale is one promising approach to obtain such insights. Here we employ scattering-type near-field scanning optical microscopy (NSOM) to probe the local spectrum of a Sb2S3 film, a very promising candidate for solar cell applications due to its high absorption coefficient and suitable bandgap. In our NSOM setup, the near field gold probe, is modulated with a frequency of 27 kHz to suppress background by demodulating the scattered optical signal at the second or third order harmonics. We measure the near field spectrum by two approaches. First, the tip is excited by a broadband pulse laser and the scattered light is recorded by a monochromator and a fast camera with up to 210 kHz line readout. Alternatively, Fourier transform spectroscopy combined with a lock-in amplifier is employed. We perform a comprehensive comparison between two methods and discuss the local spectrum information drawn from the near field spectra.