cryoRaman – Cryogenic Raman Imaging Microscope

Interest in Raman spectroscopy at room temperature, as well as at cryogenic temperatures, has been increasing across a range of scientific fields over the past two decades [1,2,3]. Initially, the primary driver of cryogenic applications was the carbon nanotubes and graphene community [4,5,6]. As a response to the needs of these researchers, attocube systems and WITec – world leaders in their respective specialties of cryogenic scanning probe microscopy and Raman spectroscopic imaging – teamed up in 2010 to develop attoRAMAN, the world´s first commercial cryogenic Raman microscope. In the meantime, cryogenic Raman spectroscopy in high magnetic fields has become an indispensable tool for studying various novel materials, in particular for researchers focused on phase-transitions or emergent properties of low-dimensional materials with application potential in electronics or sensorics. A recent surge in the number of published cryogenic Raman studies is dominated by research on transition metal dichalcogenides and van der Waals heterostructures [7,8,9,10,11]. In order to meet evolving market requirements, the two southern German companies combined their expertise once again to create cryoRaman - the cutting-edge solution for cryogenic Raman spectroscopy.

Application Examples

WSe2 120K web

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.

MoS2 WSe2 2K web

Raman image of a MoS2/WSe2 heterostructure recorded at 2K.

The colors represent different layer numbers, compositions and orientations.

MoS2 2K B Pol dep Raman web

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.

WSe2 cryoRaman T dep PL web

Temperature-dependent shift of photoluminescence (PL) spectra for WSe2. The PL images at different temperatures (300K, 200K, 50K and 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.

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