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Generalized spectral method for near-field optical microscopy
- Source :
- Jiang, B-Y; Zhang, LM; Castro Neto, AH; Basov, DN; & Fogler, MM. (2016). Generalized spectral method for near-field optical microscopy. JOURNAL OF APPLIED PHYSICS, 119(5), 054305. doi: 10.1063/1.4941343. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/1c93n54q, JOURNAL OF APPLIED PHYSICS, vol 119, iss 5, Journal of Applied Physics, vol 119, iss 5
- Publication Year :
- 2016
- Publisher :
- AIP Publishing, 2016.
-
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 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. The calculations are done within the quasistatic approximation with the radiative damping included perturbatively.<br />Comment: 25 pages, 15 figures. Minor changes to improve presentation
- Subjects :
- FOS: Physical sciences
General Physics and Astronomy
Near and far field
02 engineering and technology
01 natural sciences
Molecular physics
Mathematical Sciences
Spectral line
law.invention
Engineering
Quasistatic approximation
law
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
cond-mat.mes-hall
0103 physical sciences
Polariton
Radiative transfer
010306 general physics
Applied Physics
Physics
Condensed Matter - Mesoscale and Nanoscale Physics
Graphene
Resonance
021001 nanoscience & nanotechnology
Physical Sciences
0210 nano-technology
Spectral method
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 119
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi.dedup.....2689112f2688c3acbc5cd576abb2be58