Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 44: Scanning probe techniques: Method development – Poster

O 44.18: Poster

Dienstag, 10. März 2026, 14:00–16:00, P2

Time-of-Flight Photon Spectroscopy of STM Induced Luminescence — •Lebin Yu, Benjamin Frölich, and Fabian D. Natterer — University of Zurich, Switzerland

Scanning tunneling microscopy (STM) induced luminescence has emerged as a powerful technique for exploring molecular fluorescence using costly grating-based spectrometers. Instead, we here present a proof-of-concept experiment that integrates time-of-flight (TOF) photon spectroscopy with STM by characterizing plasmonic emission from Ag(111) and Au(111) surfaces. The luminescence is driven with short bias voltage pulses while the photon transit time is measured by collecting the timestamps of a single photon detector. The arrival time is converted into wavelength using the calibrated dispersion of a long optical fiber. Compared with grating-based spectrometers, the TOF approach distributes the dark count rate over the full spectral range, rather than every wavelength channel. The energy resolution can be adjusted by the length of the optical fiber using the same detection scheme. The combination of STM with TOF photon spectroscopy offers a versatile, scalable, and cost-effective platform for nanoscale optical spectroscopy.

Keywords: scanning tunneling microscopy; time-of-flight photon spectroscopy; luminescence; fluorescence