| Local Contact |
Paulina PLOCHOCKA |
Peter CHRISTIANEN |
Clément FAUGERAS |
Sergei ZHERLITSYN |
| Field range |
0 ... 90 T |
0 ... 38 T |
Up to 31T |
0 ... 70 T |
| Spectral range |
Si CCD, ~350 nm - 950 nm
InGaAs array detectors: 950 - 1700 nm or 1000 - 2200 nm. |
Excitation
Different types of lamps: Halogen, Xenon, Deuterium
Different types of lasers (wavelength in nm):
HeNe: 632.8, 543.5
Ti:Sapphire: 700 – 1070
Solid State: 375, 405, 485, 488, 515, 532, 640, 685, 730.
Dye laser: 540-655
Pulsed Solid State lasers: 405, 485, 640, 730
Detection
Si CCD: 350nm – 1000 nm
InGaAs array: 950 - 1700 nm
Si APDs: 375 – 1000 nm
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Different laser excitation sources (laser diodes from 390nm to 785 nm, Dye laser, Ti:Sapph laser, supercontinuum laser with monochromator from 400 nm to 800 nm, white light sources). Circular and linear polarization resolved. |
Si CCD, ~350 nm - 950 nm |
| Temperature range |
1.2 ... 290 K |
Temperature range depends on sample holder and cryostat
In general: 1.5 ... 290 K
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1.2K – 300K |
Standard temperature range is 1.5 – 300 K |
| Sample size |
< 2 mm lateral size,~ 1 mm or less height
(other arbitrarily shaped samples can also be accommodated)
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< 5 mm lateral size, ~ 1 mm or less height |
Substrate up to 12x12 mm, thickness below 5 mm, sample minimal size of from 2-3 µm |
< 2 mm lateral size |
| Sensitivity |
Usually limited by spectral resolution of the spectrometer, most commonly used 0.3 m focal length with 150, 300 or 600 grooves/mm. Resolution ~0.8-0.2 nm. Longer spectrometer can be also made available. |
Spectral resolution depends on spectrometer:
0.3 m focal length single grating: 150, 300, 600, 1200 grooves/mm.
1.0 m focal length single grating: 1200, 1800 grooves/mm
0.5 m focal length triple grating: 1800 grooves/mm.
Temporal resolution: 100 ps with pulsed laser and APD
Stray light reduction (Raman): down to 7 wavenumbers
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Different spectrometers available for high spectral resolution, high throughput, spectral range from 400 nm to 1600 nm (Si and InGaAs camera), photon correlation experiments (APD) and time resolution (~500 ps). |
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| Typical experiment |
Photoluminescence and reflectivity spectroscopy
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Polarized (Micro)Photoluminescence (excitation)
Polarized (Micro)Raman spectroscopy
Fluorescence Line Narrowing (FLN)
Polarized Photoluminescence lifetime measurements
Polarized Reflectivity spectroscopy
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Micrometer spatial resolution for magneto-photoluminescence, magneto-Raman scattering (E > 1-2 meV), magneto-PLE, magneto-reflectivity, magneto-absorption, possibility to electrically contact the sample (gate, etc ...). Spatial mapping of optical response, evolution with magnetic field, with temperature. |
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| Sample Holder |
Reflectivity sample holder with typical sample inside
Samples are mounted and fixed by mechanical
clamping on a cylindrical zircone holder
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Sample mounted on xyz-Attocube positioner with feedback (50 mm bore 30 T magnet) or without feedback (32 mm bore 38 T magnet)
Faraday and Voigt configuration
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Metallic, non-magnetic. Sample attached with regular glue or silver epoxy. Mounted on X-Y-Z piezo positioners. |
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| Sample environment |
Gaseous helium from 300 K down to 4 K,
liquid helium below in sample holder
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Helium exchange gas |
Helium exchange gas |
Gaseous helium from 300K down to 4K, liquid helium below |
| Examples |
Reflectivity (sample: single crystal perovskites) J.Phys.Chem.Lett. 8, 1851 (2017)
Photoluminescence (sample: TIPS tetracene): PNAS 115,5077 (2018)
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Photoluminescence (sample: TIPS tetracene), PNAS 115,5077 (2018)
Microphotoluminescence (sample: WSe2/MoSe2 heterostructure), Nature Comm. 8,1551 (2017)
Fluorescence Line narrowing (Sample: colloidal nanocrystals), ACS Nano 8,5921–5931 (2014)
Photoluminescence lifetimes (Sample: CdSe/CdS Colloidal Nanoplatelets), Nano Lett. 18,373−380 (2018) |
Magneto -PL:
“Flipping exciton angular momentum with chiral phonons in MoSe2/WSe2 heterobilayers”
2D Materials, Volume 7, Number 4, 2020
Magneto-Raman:
“Probing Electronic Excitations in Mono- to Pentalayer Graphene by Micro Magneto-Raman Spectroscopy” Nano Lett. 2014, 14, 8, 4548–4553
Time resolved magneto-PL:
“Manganese doping for enhanced magnetic brightening and circular polarization control of dark excitons in paramagnetic layered hybrid metal-halide perovskites”,Nat Commun 12, 3489 (2021)
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