Depth resolved nonlinear optical nanoscopy

Mostrar todas las versiones(2)

An electromagnetic field forced to vary along a plane with a spatial scale d much smaller than its free space wavelength λ decays exponentially along its normal with a decay length ∼ d. This decay, similar to that of the wavefunction of tunneling electrons, has allowed the development of scanning ne...

Descripción completa

Detalles Bibliográficos
Autor principal: Brudny, Vera Leonor
Publicado: 2003
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03701972_v240_n3_p527_Mochan
http://hdl.handle.net/20.500.12110/paper_03701972_v240_n3_p527_Mochan
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_03701972_v240_n3_p527_Mochan
record_format dspace
spelling paper:paper_03701972_v240_n3_p527_Mochan2023-06-08T15:36:24Z Depth resolved nonlinear optical nanoscopy Brudny, Vera Leonor An electromagnetic field forced to vary along a plane with a spatial scale d much smaller than its free space wavelength λ decays exponentially along its normal with a decay length ∼ d. This decay, similar to that of the wavefunction of tunneling electrons, has allowed the development of scanning near-field optical microscopes (SNOMs), reminiscent of scanning tunneling and atomic force microscopes, which have been able to resolve structures in the nanometer scale. However, existing SNOMs are unable to determine the depth below the surface from which the optical signals arise due to the monotonic decay of the optical evanescent probe fields. In this paper we study the optical second harmonic generation (SHG) produced by mixing of the evanescent fields produced by a SNOM tip. We show that employing an appropriately spatially-patterned tip, a non-monotonic non-linear probing field may be produced which has a maximum at a given distance beyond the tip, yielding a novel microscopy which may attain depth resolution with nanometric lengthscales. We estimate the size of the optical signal and we compare it with that arising in the usual SHG-based surface spectroscopy of centrosymmetric materials. © 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Fil:Brudny, V.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03701972_v240_n3_p527_Mochan http://hdl.handle.net/20.500.12110/paper_03701972_v240_n3_p527_Mochan
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description An electromagnetic field forced to vary along a plane with a spatial scale d much smaller than its free space wavelength λ decays exponentially along its normal with a decay length ∼ d. This decay, similar to that of the wavefunction of tunneling electrons, has allowed the development of scanning near-field optical microscopes (SNOMs), reminiscent of scanning tunneling and atomic force microscopes, which have been able to resolve structures in the nanometer scale. However, existing SNOMs are unable to determine the depth below the surface from which the optical signals arise due to the monotonic decay of the optical evanescent probe fields. In this paper we study the optical second harmonic generation (SHG) produced by mixing of the evanescent fields produced by a SNOM tip. We show that employing an appropriately spatially-patterned tip, a non-monotonic non-linear probing field may be produced which has a maximum at a given distance beyond the tip, yielding a novel microscopy which may attain depth resolution with nanometric lengthscales. We estimate the size of the optical signal and we compare it with that arising in the usual SHG-based surface spectroscopy of centrosymmetric materials. © 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
author Brudny, Vera Leonor
spellingShingle Brudny, Vera Leonor
Depth resolved nonlinear optical nanoscopy
author_facet Brudny, Vera Leonor
author_sort Brudny, Vera Leonor
title Depth resolved nonlinear optical nanoscopy
title_short Depth resolved nonlinear optical nanoscopy
title_full Depth resolved nonlinear optical nanoscopy
title_fullStr Depth resolved nonlinear optical nanoscopy
title_full_unstemmed Depth resolved nonlinear optical nanoscopy
title_sort depth resolved nonlinear optical nanoscopy
publishDate 2003
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03701972_v240_n3_p527_Mochan
http://hdl.handle.net/20.500.12110/paper_03701972_v240_n3_p527_Mochan
work_keys_str_mv AT brudnyveraleonor depthresolvednonlinearopticalnanoscopy
_version_ 1768544822142959616

Ejemplares similares