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Title: Generalized spectral method for near-field optical microscopy

Abstract

Electromagnetic interaction between a sub-wavelength particle (the “probe”) and a material surface (the “sample”) is studied theoretically. The interaction is shown to be governed by a series of resonances corresponding to surface polariton modes localized near the probe. The resonance parameters depend on the dielectric function and geometry of the probe as well as on the surface reflectivity of the material. Calculation of such resonances is carried out for several types of axisymmetric probes: spherical, spheroidal, and pear-shaped. For spheroids, an efficient numerical method is developed, capable of handling cases of large or strongly momentum-dependent surface reflectivity. Application of the method to highly resonant materials, such as aluminum oxide (by itself or covered with graphene), reveals a rich structure of multi-peak spectra and nonmonotonic approach curves, i.e., the probe-sample distance dependence. These features also strongly depend on the probe shape and optical constants of the model. For less resonant materials such as silicon oxide, the dependence is weak, so that the spheroidal model is reliable. Here, the calculations are done within the quasistatic approximation with radiative damping included perturbatively.

Authors:
 [1];  [1];  [2];  [1];  [1]
  1. Univ. of California San Diego, La Jolla, CA (United States)
  2. Boston Univ., Boston, MA (United States); National Univ. of Singapore (Singapore)
Publication Date:
Research Org.:
Boston Univ., MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1469207
Alternate Identifier(s):
OSTI ID: 1236990
Grant/Contract Number:  
FG02-08ER46512; SC00122592
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 119; Journal Issue: 5; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Jiang, B. -Y., Zhang, L. M., Castro Neto, A. H., Basov, D. N., and Fogler, M. M. Generalized spectral method for near-field optical microscopy. United States: N. p., 2016. Web. doi:10.1063/1.4941343.
Jiang, B. -Y., Zhang, L. M., Castro Neto, A. H., Basov, D. N., & Fogler, M. M. Generalized spectral method for near-field optical microscopy. United States. https://doi.org/10.1063/1.4941343
Jiang, B. -Y., Zhang, L. M., Castro Neto, A. H., Basov, D. N., and Fogler, M. M. Fri . "Generalized spectral method for near-field optical microscopy". United States. https://doi.org/10.1063/1.4941343. https://www.osti.gov/servlets/purl/1469207.
@article{osti_1469207,
title = {Generalized spectral method for near-field optical microscopy},
author = {Jiang, B. -Y. and Zhang, L. M. and Castro Neto, A. H. and Basov, D. N. and Fogler, M. M.},
abstractNote = {Electromagnetic interaction between a sub-wavelength particle (the “probe”) and a material surface (the “sample”) is studied theoretically. The interaction is shown to be governed by a series of resonances corresponding to surface polariton modes localized near the probe. The resonance parameters depend on the dielectric function and geometry of the probe as well as on the surface reflectivity of the material. Calculation of such resonances is carried out for several types of axisymmetric probes: spherical, spheroidal, and pear-shaped. For spheroids, an efficient numerical method is developed, capable of handling cases of large or strongly momentum-dependent surface reflectivity. Application of the method to highly resonant materials, such as aluminum oxide (by itself or covered with graphene), reveals a rich structure of multi-peak spectra and nonmonotonic approach curves, i.e., the probe-sample distance dependence. These features also strongly depend on the probe shape and optical constants of the model. For less resonant materials such as silicon oxide, the dependence is weak, so that the spheroidal model is reliable. Here, the calculations are done within the quasistatic approximation with radiative damping included perturbatively.},
doi = {10.1063/1.4941343},
journal = {Journal of Applied Physics},
number = 5,
volume = 119,
place = {United States},
year = {Fri Feb 05 00:00:00 EST 2016},
month = {Fri Feb 05 00:00:00 EST 2016}
}

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