Time-domain photocurrent spectroscopy based on a common-path birefringent interferometer

Lukas Wolz; Constantin Heshmatpour; Antonio Perri; Dario Polli; Giulio Cerullo; Jonathan J Finley; Erling Thyrhaug; Jürgen Hauer; Andreas V Stier

doi:10.1063/5.0023543

Time-domain photocurrent spectroscopy based on a common-path birefringent interferometer

Rev Sci Instrum. 2020 Dec 1;91(12):123101. doi: 10.1063/5.0023543.

Authors

Lukas Wolz¹, Constantin Heshmatpour², Antonio Perri³, Dario Polli³, Giulio Cerullo³, Jonathan J Finley¹, Erling Thyrhaug², Jürgen Hauer², Andreas V Stier¹

Affiliations

¹ Department of Physics, Technical University of Munich, Walter Schottky Institut, 85748 Garching, Germany.
² Dynamical Spectroscopy, Department of Chemistry, Technical University of Munich, 85748 Garching, Germany.
³ IFN-CNR and Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy.

PMID: 33379948
DOI: 10.1063/5.0023543

Abstract

We present diffraction-limited photocurrent (PC) microscopy in the visible spectral range based on broadband excitation and an inherently phase-stable common-path interferometer. The excellent path-length stability guarantees high accuracy without the need for active feedback or post-processing of the interferograms. We illustrate the capabilities of the setup by recording PC spectra of a bulk GaAs device and compare the results to optical transmission data.