Nonlinear chiral imaging of subwavelength-sized twisted-cross gold nanodimers

Mikko Huttunen; Godofredo Bautista; Manuel Decker; Stefan Linden; Martin Wegener; Martti Kauranen

doi:10.1364/OME.1.000046

Nonlinear chiral imaging of subwavelength-sized twisted-cross gold nanodimers

Mikko Huttunen, Godofredo Bautista, Manuel Decker, Stefan Linden, Martin Wegener, Martti Kauranen

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Abstract

We perform second-harmonic generation (SHG) microscopy with circularly polarized (CP) light to measure chirality of individual twisted-cross gold nanodimers. The chiral signatures, based on different SHG response for the two CP components of incident light, are clearly visible even with off-resonance excitation. The SHG responses of individual nanodimers are found to vary by about a factor of five. The technique thus has very high sensitivity to the nanoscale deformations of the structure. The chiral signatures of the dimers, however, are found to be more uniform, and the technique is thus able to recognize the handedness of the twisted nanodimers with high reliability.

Translated title of the contribution	Nonlinear chiral imaging of subwavelength-sized twisted-cross gold nanodimers
Original language	English
Pages (from-to)	46-56
Number of pages	11
Journal	Optical Materials Express
Volume	1
Issue number	1
DOIs	https://doi.org/10.1364/OME.1.000046
Publication status	Published - 22 Apr 2011
Publication type	A1 Journal article-refereed

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10.1364/OME.1.000046

Huttunen nonlinear chiral imaging
Copyright 2011 The Optical Society

http://urn.fi/URN:NBN:fi:tty-2011111514880

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AU - Bautista, Godofredo

AU - Decker, Manuel

AU - Linden, Stefan

AU - Wegener, Martin

AU - Kauranen, Martti

N1 - uusi lehti, tiedot tarkistettava myöhemmin: Ulrich's, ISI, julkaisufoorumi<br/>Contribution: organisation=fys,FACT1=1

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N2 - We perform second-harmonic generation (SHG) microscopy with circularly polarized (CP) light to measure chirality of individual twisted-cross gold nanodimers. The chiral signatures, based on different SHG response for the two CP components of incident light, are clearly visible even with off-resonance excitation. The SHG responses of individual nanodimers are found to vary by about a factor of five. The technique thus has very high sensitivity to the nanoscale deformations of the structure. The chiral signatures of the dimers, however, are found to be more uniform, and the technique is thus able to recognize the handedness of the twisted nanodimers with high reliability.

AB - We perform second-harmonic generation (SHG) microscopy with circularly polarized (CP) light to measure chirality of individual twisted-cross gold nanodimers. The chiral signatures, based on different SHG response for the two CP components of incident light, are clearly visible even with off-resonance excitation. The SHG responses of individual nanodimers are found to vary by about a factor of five. The technique thus has very high sensitivity to the nanoscale deformations of the structure. The chiral signatures of the dimers, however, are found to be more uniform, and the technique is thus able to recognize the handedness of the twisted nanodimers with high reliability.

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Nonlinear chiral imaging of subwavelength-sized twisted-cross gold nanodimers

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