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Article Dans Une Revue Review of Scientific Instruments Année : 2022

Design and implementation of a device based on an off-axis parabolic mirror to perform luminescence experiments in a scanning tunneling microscope

Résumé

We present the design, the implementation, and illustrative results of a light collection/injection strategy based on an off-axis parabolic mirror collector for a low-temperature Scanning Tunneling Microscope (STM). This device allows to perform STM induced Light Emission (STM-LE) and Cathodoluminescence (STM-CL) experiments as well as in situ Photoluminescence (PL) and Raman spectroscopy as complementary techniques. Considering the Étendue conservation and using an off-axis parabolic mirror, it is possible to design a light collection and injection system that displays 72% of collection efficiency (considering the hemisphere above the sample surface) while maintaining high spectral resolution and minimizing signal loss. The performance of the STM is tested by atomically resolved images and scanning tunneling spectroscopy results on standard sample surfaces. The capabilities of our system are demonstrated by performing STM-LE on metallic surfaces and 2D semiconducting samples, observing both plasmonic and excitonic emissions. Also, we carried out in situ PL measurements on semiconducting monolayers and quantum dots, and in situ Raman on graphite and hexagonal boron nitride (h-BN) samples. Additionally, STM-CL and PL were obtained on monolayer h-BN gathering luminescence spectra that are typically associated with intragap states related to carbon defects. The results show that the flexible and efficient light injection and collection device based on an off-axis parabolic mirror is a powerful tool to study several types of nanostructures with multiple spectroscopic techniques in correlation with their morphology at the atomic scale and electronic structure.
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Dates et versions

hal-03811412 , version 1 (11-10-2022)

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Ricardo Javier Peña Román, Yves Auad, Lucas Grasso, Lazaro A Padilha, Fernando Alvarez, et al.. Design and implementation of a device based on an off-axis parabolic mirror to perform luminescence experiments in a scanning tunneling microscope. Review of Scientific Instruments, 2022, 93 (4), pp.043704. ⟨10.1063/5.0078423⟩. ⟨hal-03811412⟩
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