Nonlinear chiral imaging of twisted-cross gold nano-objects
Date
2011
Authors
Huttunen, Mikko J
Bautista, Godofredo
Decker, Manuel
Linden, Stefan
Wegener, M
Kauranen, Martti
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European Physical Society
Abstract
Chirality, i.e., lack of reflection symmetry, is a property of materials which leads to optical activity (OA) effects [1]. Chiral materials occur in two enantiomers, which are mirror images of each other. In recent years, chiral metamaterials based on metal nanostructures have been shown to lead to greatly enhanced OA effects in the linear optical response [2,3]. On the other hand, second-harmonic generation (SHG) from ideally achiral metal nanostructures is extremely sensitive to chiral symmetry breaking due to surface defects [4]. It is therefore important to study whether nonlinear techniques can be used as a probe of the handedness of chiral metamaterials fabricated using state-of-the art techniques. Here we demonstrate that SHG microscopy with circularly-polarized light possesses an unambiguous sensitivity to the handedness of twisted-cross metamaterials to the level of individual subwavelength-sized nano-objects.
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Keywords
Keywords: Chiral material; Chiral symmetry; Linear optical response; Metal nanostructure; Mirror images; Nano-objects; Nonlinear techniques; Optical activity; Reflection symmetry; State of the art; Chirality; Enantiomers; Metamaterials; Nanostructures; Optics; Quan
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European Conference on Lasers and Electro-Optics (CLEO/Europe) 2011
Type
Conference paper
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2037-12-31
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