FTIR Spectroscopy and Electrical Characterization

Spectra of the sample are recorded using a Bruker Vertex 80 FTIR spectrometer with a resolution of 2.25 GHz, using an pyroelectric deuterated triglycine sulfate (DTGS) detector. The device is mounted in a liquid-helium-cooled-flow cryostat that is optically coupled to the spectrometer via parabolic mirrors. For L–I–V measurements, the light intensity L is acquired by feeding the FTIR-detector output (internal DTGS detector) into a lock-in amplifier (Stanford Research Systems SR830) and measuring the signal at the modulation frequency of 10 Hz. The current flowing through the device is measured with a coaxial current probe (Tektronix CT-1), which is connected to the output of a voltage pulser (HP8114A). The measurement data of the current I and voltage V are acquired using a digital oscilloscope (Tektronix DPO 3032).

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Schönhuber S., Bachelard N., Limbacher B., Kainz M.A., Andrews A.M., Detz H., Strasser G., Darmo J., Rotter S, & Unterrainer K. (2020). All-optical adaptive control of quantum cascade random lasers. Nature Communications, 11, 5530.

Publication 2020

Vertex 80 FTIR spectrometer SR830

Device Digital Ftir Helium Light Triglycine sulfate

Corresponding Organization : TU Wien

Other organizations : Central European Institute of Technology, Brno University of Technology

Top 5 similar protocols

Variable analysis

independent variables

Light intensity (L)

dependent variables

Current (I)
Voltage (V)

control variables

Resolution of the Bruker Vertex 80 FTIR spectrometer (2.25 GHz)
Detector type (pyroelectric deuterated triglycine sulfate (DTGS) detector)
Cryostat (liquid-helium-cooled-flow cryostat)
Optical coupling (parabolic mirrors)
Lock-in amplifier frequency (10 Hz)
Voltage pulser (HP8114A)
Digital oscilloscope (Tektronix DPO 3032)

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