PL, PLE, Micro – Photoluminescence and Micro-Raman Systems

FEATURES TOULOUSE NIJMEGEN GRENOBLE DRESDEN
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 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 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)
< 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 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).
Typical experiment Photoluminescence and reflectivity spectroscopy Polarized (Micro)Photoluminescence (excitation) Polarized (Micro)Raman spectroscopy Fluorescence Line Narrowing (FLN) Polarized Photoluminescence lifetime measurements Polarized Reflectivity spectroscopy 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.
Sample Holder
Reflectivity sample holder with typical sample inside
Samples are mounted and fixed by mechanical clamping on a cylindrical zircone holder
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 Metallic, non-magnetic. Sample attached with regular glue or silver epoxy. Mounted on X-Y-Z piezo positioners.
Sample environment Gaseous helium from 300 K down to 4 K,
liquid helium below in sample holder
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)
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)
local contact: P.Plochocka
local contact: P. Christianen
local contact: C. FAUGERAS
local contact: S. ZHERLITSYN