Novel Tuning Fork Sensor for Low-Temperature Near-Field Spectroscopy
A SNOM apparatus working at liquid-He temperatures has been realized and characterized. Standard optical facilities allow for a combined spatial and spectral analysis of the photoluminescence emissions in semiconductors. A novel distance control system is used. The sensitivity in the approach direction is 0.2 nm, and quality factors up to 2850 have been obtained. No electronic components are needed close to the sensor, allowing to employ it in a liquid He environment. The system is extremely compact and allows for several hours stability at 5 K.
KeywordsNonradiative Recombination Optical Resolution Distance Control Quartz Tuning Fork Spectral Emission Line
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