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Abstract:

When irradiating the sample of a scanning tunneling microscope with a modulated light intensity, light absorption results in tip and sample heating and expansion at the modulation frequency, obscuring other possible laser induced mechanisms. This thermal noise limits the use of light modulation when very high spatial resolution is desired in fluorescence or nonlinear optics near field experiments, being an extreme case the measurement of the optical rectification with scanning tunneling microscopes. In this work we describe a method in which the thermal expansion at the modulation frequency can be reduced by orders of magnitude. The method is based on the irradiation of the sample with two interfering laser beams at different frequencies and incidence direction, giving light fringes traveling in the illuminated zone. Solving the heat diffusion equation we predict the thermal behavior of sample and find a good agreement with experimental data. © 2000 American Institute of Physics.

Registro:

Documento: Artículo
Título:Quenching the thermal contribution in laser assisted scanning tunneling microscopy
Autor:Landi, S.M.; Martínez, O.E.
Filiación:Lab. de Electronica Cuantica, Departamento de Física, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina
Año:2000
Volumen:88
Número:8
Página de inicio:4840
Página de fin:4844
DOI: http://dx.doi.org/10.1063/1.1311834
Título revista:Journal of Applied Physics
Título revista abreviado:J Appl Phys
ISSN:00218979
CODEN:JAPIA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00218979_v88_n8_p4840_Landi

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Citas:

---------- APA ----------
Landi, S.M. & Martínez, O.E. (2000) . Quenching the thermal contribution in laser assisted scanning tunneling microscopy. Journal of Applied Physics, 88(8), 4840-4844.
http://dx.doi.org/10.1063/1.1311834
---------- CHICAGO ----------
Landi, S.M., Martínez, O.E. "Quenching the thermal contribution in laser assisted scanning tunneling microscopy" . Journal of Applied Physics 88, no. 8 (2000) : 4840-4844.
http://dx.doi.org/10.1063/1.1311834
---------- MLA ----------
Landi, S.M., Martínez, O.E. "Quenching the thermal contribution in laser assisted scanning tunneling microscopy" . Journal of Applied Physics, vol. 88, no. 8, 2000, pp. 4840-4844.
http://dx.doi.org/10.1063/1.1311834
---------- VANCOUVER ----------
Landi, S.M., Martínez, O.E. Quenching the thermal contribution in laser assisted scanning tunneling microscopy. J Appl Phys. 2000;88(8):4840-4844.
http://dx.doi.org/10.1063/1.1311834