Pylon 100br excelon

Raman detection unit composed of a spectrometer (Princeton Instruments Acton series SP-2500) and a liquid nitrogen cooled CCD camera (Princeton Instruments PyLoN-100BR-eXcelon) is used for Raman spectra measurements. A Sapphire SF 488 nm laser is applied to the sample with 2 mW laser power.

Single-object experiments use a home-built micro-PL setup under ambient conditions. The sample is excited using a 594 nm CW diode laser (Cobolt Mambo 100), which is focused on the sample using an oil-immersive microscope objective (NA = 1.42, Olympus PLAPON 60X), mounted on XYZ piezoelectric translational stages (Mad City Labs Inc.) for sample scanning. Luminescence signal is collected using the same objective and focused on a 50 µm pinhole for confocal selection. Spectral selection is performed to remove the excitation beam using a dichroic mirror (zt 594 RDC, Chroma) and a long-pass filter (FELH0600, Thorlabs). After confocal selection, the signal is either directed to silicon-based avalanche photodiodes (SPCM-AQR-13, PerkinElmer) for raster scan measurements, or to a monochromator (SP-2350, Princeton Instruments) coupled to a LN-cooled CCD camera (PyLoN:100BR eXcelon, Princeton Instruments) for spectral measurements. Interface of the translational stages and the detectors with computer uses an acquisition card (PCIe-6323, National Instruments). Raster scans and result display are performed using a python-based suite^{54 (link)}.