IR Spectrometry

Our group develops measurement techniques for the investigation of optical material properties in the IR and THz spectral range. Here we focus on optical nearfield techniques and the coherent generation of THz synchrotron radiation. Many applications lie in the fields of semiconductor materials and bioanalytics. The group operates two beamlines at the electron storage ring of PTB, the Metrology Light Source (MLS).

• Methods relating to Synchrotron IR Nano Spectroscopy (SINS) and Photocurrent-Nanoscopy
• Methods for bioanalytics, for instance, for characterizing food products or the classification of germs.
• Time resolved spectroscopic studies of electron bunches in cooperation with the Helmholtz Zentrum Berlin (HZB)
• Application of data analysis methods for efficient data acquisition of hyperspectral data sets  (compressed sensing, low-rank matrix reconstruction)

The group offers measurement services using two FTIR-spectrometers and a s-SNOM system within EURAMET.

Selected publications

• Albrecht, K., Hoehl, A., Esuain, B. A. & Kamps, T. Monitoring the size of low-intensity beams at plasma-wakefield accelerators using high-resolution interferometry.
  Commun. Phys. 4, 214 (2021)
• Deng, X. et al. Experimental demonstration of the mechanism of steady-state microbunching.
  Nature 590, 576–579 (2021)
• Barcelos, I. D. et al. Probing Polaritons in 2D Materials with Synchrotron Infrared
  Nanospectroscopy. Adv. Opt. Mater. 8, 1901091 (2020)
• Barnett, J. et al. Phonon‐Enhanced Near‐Field Spectroscopy to Extract the Local Electronic Properties of Buried 2D Electron Systems in Oxide Heterostructures.
  Adv. Funct. Mater. 30, 2004767 (2020)
• Kästner, B. et al. Compressed sensing FTIR nano-spectroscopy and nano-imaging.
  Opt. Express 26, 18115 (2018)

Bachelor und Master theses

• Routenminimierung bei der Erfassung mehrdimensionaler Daten am Nahfeldmikroskop für die Nutzbarmachung von Compressed Sensing (Bachelor thesis 2020) – Oleg Kornelsen (Hochschule für Wirtschaft und Recht Berlin)
• Rasterkraftmikroskopie-Iterative Ansteuerung eines Rasterkraftmikroskops mittels Bilderkennung, (Bachelor thesis 2019) – Sebastian Sachse (Hochschule für Wirtschaft und Recht Berlin)
• Charakterisierung von SiC-Schichtsystemen mittels Nahfeld-Mikroskopie (Bachelor thesis 2016) – Jakob Fehmel (Freie Universität Berlin)
• Differenzierung und Klassifikation vonLeishmanienspezies mittels Fourier-Transform-Infrarotspektroskopie, (Master thesis 2016) – Denise Sinning (Technische Hochschule Wildau)
• Charakterisierung von Peptiden mittels Synchrotron-gestützterTHz Spektroskopie, (Bachelor thesis 2014) – Michael Andersch (Fachhochschule Brandenburg)