cryogenic Raman microscope
hyperspectral imaging with unprecedented resolution and speed
automated Raman spectra at each pixel
low-vibration closed-cycle cryostats
variable temperature at maximum field; solenoid or vector magnets
suited for wide variety of applications
various upgrades (e.g. low wavenumbers & polarization control)
The cryoRaman - jointly developed by attocube and WITec - integrates attocube’s leading-edge cryostat and nanopositioner technology with the vaunted sensitivity and modularity of WITec’s correlative microscope series.
The system blends a high-resolution confocal microscope with ultra sensitive optics for micro-Raman spectroscopy at low temperatures and in high magnetic fields. The cryoRaman is a highly user-friendly, turn-key system, delivered with a laser source (available wavelenghts 532nm, 633nm and 785nm, others upon request), an ultra-high throughput spectrometer including a peltier-cooled BI CCD (FI, DD and EMCCD upon request), and a state-of-the-art Raman controller/software package.
The instrument uses a set of xyz-positioners for coarse positioning of the sample over a range of several mm, and a piezoelectric scanner with a large scan range even at cryogenic temperatures. The Raman image is obtained by raster scanning the sample with respect to the laser focus and measuring the spectral distribution of the Raman signal for each pixel.
For the first time, Raman imaging at the lowest temperatures in high magnetic fields is easily accessible with unmatched spatial, spectral and depth resolution.
For more info on Raman microscopy please refer to the fundamentals section.
|type of instrument||confocal Raman microscope for low temperatures and high magnetic fields|
|compatibility||for a toploader cryostat or integrated into an optical table|
|objectives/lenses||high NA cryogenic objectives: LT-APO/532-Raman, LT-APO/633-Raman, LT-APO/NIR, others upon request|
|key features||detection of Raman peaks down to <10 rel. cm-1; many upgrades including polarization control|
|Modes of Operation|
|imaging modes||single point measurements or imaging (mapping) of Raman, photoluminescence or fluorescence|
|optional upgrades||polarization control and analysis|
|lateral resolution||<400nm (for 532nm excitation)|
|vertical resolution||<2µm (for 532nm excitation)|
|spectrometer||mirror-free high throughput spectrometer with f=300; others upon request|
|filters||<90cm-1 (RayLine Coupler), <10cm-1 (RayShield Coupler) Raman cut-off (optional)|
|gratings||for 532nm excitation: 600/mm and 1800/mm (BLZ 500nm) on automated triple grating turret; others upon request|
|spectral resolution||<1cm-1/pixel (1800/mm grating)|
|CCD camera||high-sensitivity back-illuminated CCD detector, peltier-cooled to -60 °C at 20 °C room temperature, 1024x127 pixels, 90% quantum efficiency at 532 nm, 100 kHz readout; FI, DD, EMCCD upon request|
|total travel range||5 x 5 x 4.8 mm³ (open loop)|
|step size||0.05..3 µm @ 300 K, 10..500 nm @ 4 K|
|fine scan range||50 x 50 µm² @ 300 K, 30 x 30 µm² @ 4 K (open loop)|
|sample holder||ASH/QE/8/CFM or ASH/QE/4CX|
|Suitable Operating Conditions|
|temperature range||4K..320K (attoDRY800 with LT-APO shroud); 1.8K..300K (attoDRY2100)|
|magnetic field range||up to 12T (depending on magnet)|
|excitation wavelength||532nm, 633nm, 785nm, others upon request|
|Scan Controller and Software|
|scan controller||WITec USB 3.0 FPGA based scan controller providing open loop control of the cryogenic piezo-scanners, spectrometer control and full automation control (if chosen)|
|software||powerful WITec software package for video & data acquisition and analysis|
|field of view||>40µm diagonal|
|type of camera||color video image, good contrast for i.e. 2D materials|
|Options and Upgrades|
|automation||TruePower (calibrated laser power), automated shutters, automated switching between white light and Raman, automated calibration|
|additional feedthroughs||DC and high-frequency lines & optical fiber feedthroughs|
|add ons||additional optical breadboards for home-built optics experiments (attoDRY2100)|
|table upgrades||various sizes for optical table (attoDRY800)|
|software upgrade||TrueMatch: software for spectra analysis and for building up a spectral library|
|programming upgrade||LabVIEW package: building blocks for writing your own integrated control of temperature, magnet and Raman software|
Fields of Applications
Imaging and scanning probe microscopy of surface properties on the nanoscale at variable temperatures down to milli Kelvin and combination with high magnetic fields.
Optics and Spectroscopy
Confocal microscopy and nanoscale spectroscopy at low temperatures and in high magnetic fields on quantum dots, NV centers, 2D materials, nanowires and other materials.
Systems for microscopy and nanoscale analysis of material properties at ambient and low temperature and in high magnetic fields.