cryoRaman – Cryogenic Raman Imaging Microscope

cryoRaman, developed by WITec GmbH and attocube systems AG,delivers the analytical power of Raman imaging with unmatched spatial resolution at very low temperatures. It was developed for researchers investigating materials that reveal novel properties when cooled to near absolute zero.

By combining the performance and modularity of the alpha300 microscope series with advanced cryostat and nanopositioner technology, experiments down to 1.8 Kelvin (K) in high magnetic fields are made easily accessible.

Designed to meet existing and emerging challenges, cryoRaman offers a robust standard feature set that can be augmented through an extensive range of options.

Key Features

Excitation wavelengths from VIS to NIR with optimized spectrometers

1.8K - 300Koperating temperatures

Low-vibration closed-cycle cryostats

Unique cryogenic-compatible Raman-specific objectives

Exceptionally precise low temperature nanopositioner

Solenoid magnets with a strength of up to 12 Tesla or vector magnets

Full polarization control in excitation and detection

Raman image of tungsten diselenide (WSe₂) recorded at 120K. Areas with one (green), two (blue)and three (red) layers were clearly identified from their Raman spectra. Image Credit: WITec GmbH

Raman image of a MoS₂/WSe₂ heterostructure recorded at 2K. The colors represent different layer numbers, compositionsand orientations. Image Credit: WITec GmbH

Polarization- and magnetic field-dependent Raman images of single- and multi-layer MoS₂ at 2K. The A’1 /E’ intensity ratio is color coded. The polarizer and analyzer were oriented perpendicular or parallel to each other as indicated. Image Credit: WITec GmbH

Temperature-dependent shift of photoluminescence (PL) spectra for WSe₂. The PL images at different temperatures (300K, 200K, 50Kand 2K) are color coded according to the PL peak position. The normalized PL spectra for each temperature are color-coded accordingly, with solid and dashed lines representing spectra from the center and the outer edges of the single layer, respectively. Image Credit: WITec GmbH