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Recognition of multipolar second-order nonlinearities in thin-film samples

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Recognition of multipolar second-order nonlinearities in thin-film samples. / Koskinen, Kalle; Czaplicki, Robert; Kauranen, Martti.

2016. Paper presented at Physics days 2016, Oulu, Finland.

Research output: Other conference contributionPaper, poster or abstractScientific

Harvard

Koskinen, K, Czaplicki, R & Kauranen, M 2016, 'Recognition of multipolar second-order nonlinearities in thin-film samples' Paper presented at Physics days 2016, Oulu, Finland, 29/03/15 - 31/03/16, .

APA

Koskinen, K., Czaplicki, R., & Kauranen, M. (2016). Recognition of multipolar second-order nonlinearities in thin-film samples. Paper presented at Physics days 2016, Oulu, Finland.

Vancouver

Koskinen K, Czaplicki R, Kauranen M. Recognition of multipolar second-order nonlinearities in thin-film samples. 2016. Paper presented at Physics days 2016, Oulu, Finland.

Author

Koskinen, Kalle ; Czaplicki, Robert ; Kauranen, Martti. / Recognition of multipolar second-order nonlinearities in thin-film samples. Paper presented at Physics days 2016, Oulu, Finland.

Bibtex - Download

@conference{4ff12e8675bd4988b0f935aab4b2fdb4,
title = "Recognition of multipolar second-order nonlinearities in thin-film samples",
abstract = "Second-order nonlinear optical processes provide the basis for many important optical phenomena such as frequency conversion and electro-optic modulation of light. A prime example of a second-order process is the second-harmonic generation (SHG), i.e., con-version of light at a fundamental frequency to light at the doubled frequency . The main limitation of SHG is that - within the electric-dipole approximation of the light-matter interaction - it can occur only in non-centrosymmetric materials. However, higher multipole (magnetic-dipole and electric-quadrupole) effects do not suffer from such restriction. Thus, multipole effects can provide an interesting avenue towards novel second-order materials.Although multipole effects have been already utilized in nanostructured materials, the design guidelines for strong multipolar responses in bulk of materials are poorly under-stood, and such responses are difficult to address reliably in experiments. Multipole ef-fects can be studied by second-harmonic generation with two non-collinear beams at the fundamental frequency [1,2]. However, this technique was originally developed for bulk samples and new materials are commonly characterized as thin films. Thus, the existing models used to interpret two-beam experiments fail in properly accounting for effects particular to thin films, including propagation effects and multiple reflections. This gives rise to significant difficulties in the recognition of multipolar nonlinearities.We introduce a detailed model that fully accounts for all thin-film effects and show that apparent multipole nonlinearities can arise from such effects even when the nonlinearity has strictly dipolar origin. Our results show both theoretically and experimentally that reliable recognition of multipolar responses of new materials will require extremely careful experiments combined with detailed theoretical modelling.",
author = "Kalle Koskinen and Robert Czaplicki and Martti Kauranen",
year = "2016",
month = "3",
language = "English",
note = "Physics days 2016 ; Conference date: 29-03-2015 Through 31-03-2016",
url = "http://fp2016.fi/",

}

RIS (suitable for import to EndNote) - Download

TY - CONF

T1 - Recognition of multipolar second-order nonlinearities in thin-film samples

AU - Koskinen, Kalle

AU - Czaplicki, Robert

AU - Kauranen, Martti

PY - 2016/3

Y1 - 2016/3

N2 - Second-order nonlinear optical processes provide the basis for many important optical phenomena such as frequency conversion and electro-optic modulation of light. A prime example of a second-order process is the second-harmonic generation (SHG), i.e., con-version of light at a fundamental frequency to light at the doubled frequency . The main limitation of SHG is that - within the electric-dipole approximation of the light-matter interaction - it can occur only in non-centrosymmetric materials. However, higher multipole (magnetic-dipole and electric-quadrupole) effects do not suffer from such restriction. Thus, multipole effects can provide an interesting avenue towards novel second-order materials.Although multipole effects have been already utilized in nanostructured materials, the design guidelines for strong multipolar responses in bulk of materials are poorly under-stood, and such responses are difficult to address reliably in experiments. Multipole ef-fects can be studied by second-harmonic generation with two non-collinear beams at the fundamental frequency [1,2]. However, this technique was originally developed for bulk samples and new materials are commonly characterized as thin films. Thus, the existing models used to interpret two-beam experiments fail in properly accounting for effects particular to thin films, including propagation effects and multiple reflections. This gives rise to significant difficulties in the recognition of multipolar nonlinearities.We introduce a detailed model that fully accounts for all thin-film effects and show that apparent multipole nonlinearities can arise from such effects even when the nonlinearity has strictly dipolar origin. Our results show both theoretically and experimentally that reliable recognition of multipolar responses of new materials will require extremely careful experiments combined with detailed theoretical modelling.

AB - Second-order nonlinear optical processes provide the basis for many important optical phenomena such as frequency conversion and electro-optic modulation of light. A prime example of a second-order process is the second-harmonic generation (SHG), i.e., con-version of light at a fundamental frequency to light at the doubled frequency . The main limitation of SHG is that - within the electric-dipole approximation of the light-matter interaction - it can occur only in non-centrosymmetric materials. However, higher multipole (magnetic-dipole and electric-quadrupole) effects do not suffer from such restriction. Thus, multipole effects can provide an interesting avenue towards novel second-order materials.Although multipole effects have been already utilized in nanostructured materials, the design guidelines for strong multipolar responses in bulk of materials are poorly under-stood, and such responses are difficult to address reliably in experiments. Multipole ef-fects can be studied by second-harmonic generation with two non-collinear beams at the fundamental frequency [1,2]. However, this technique was originally developed for bulk samples and new materials are commonly characterized as thin films. Thus, the existing models used to interpret two-beam experiments fail in properly accounting for effects particular to thin films, including propagation effects and multiple reflections. This gives rise to significant difficulties in the recognition of multipolar nonlinearities.We introduce a detailed model that fully accounts for all thin-film effects and show that apparent multipole nonlinearities can arise from such effects even when the nonlinearity has strictly dipolar origin. Our results show both theoretically and experimentally that reliable recognition of multipolar responses of new materials will require extremely careful experiments combined with detailed theoretical modelling.

M3 - Paper, poster or abstract

ER -