| Full text | |
| Author(s): |
Pena Roman, Ricardo Javier
;
Auad, Yves
;
Grasso, Lucas
;
Padilha, Lazaro A.
;
Alvarez, Fernando
;
Barcelos, Ingrid David
;
Kociak, Mathieu
;
Zagonel, Luiz Fernando
Total Authors: 8
|
| Document type: | Journal article |
| Source: | Review of Scientific Instruments; v. 93, n. 4, p. 18-pg., 2022-04-01. |
| Abstract | |
We present the design, 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 us to perform STM induced Light Emission (STM-LE) and Cathodoluminescence (STM-CL) experiments and in situ Photoluminescence (PL) and Raman spectroscopy as complementary techniques. Considering the etendue 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 two-dimensional semiconducting samples, observing both plasmonic and excitonic emissions. In addition, 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. Published under an exclusive license by AIP Publishing. (AU) | |
| FAPESP's process: | 21/06893-3 - Optically active materials studied by scanning tunnelling microscopy |
| Grantee: | Luiz Fernando Zagonel |
| Support Opportunities: | Research Grants - Young Investigators Grants - Phase 2 |
| FAPESP's process: | 18/08543-7 - Light emission by individual defects in 2D materials |
| Grantee: | Ricardo Javier Peña Román |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 14/23399-9 - Heterostructures in semiconducting nanowires: nanometric light emitters studied by scanning tunnelling microscopy |
| Grantee: | Luiz Fernando Zagonel |
| Support Opportunities: | Research Grants - Young Investigators Grants |