Near-field local enhancement by ordered arrays of sub-wavelength scattering centers fabricated by femtosecond ablation

We show how the ultrafast laser inscription of nanodimple arrays enables near-field local enhancement in high refractive-index crystals. We first demonstrate both experimentally and numerically how, when two nanodimples are separated by intermediate distances (700–1000 nm), near-field interference c...

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Published inApplied physics. B, Lasers and optics Vol. 103; no. 1; pp. 51 - 55
Main Authors Barrio, J., Lamela, J., Ródenas, A., Zhou, G., Lifante, G., Jaque, F., Jaque, D., Gu, M.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer-Verlag 01.04.2011
Subjects
Arrays
Crystals
Engineering
Femtosecond
Lasers
Nanocomposites
Nanomaterials
Nanostructure
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Separation Distance
Local Enhancement
Femtosecond Laser
Lithium Niobate
Dope Lithium Niobate
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Summary:We show how the ultrafast laser inscription of nanodimple arrays enables near-field local enhancement in high refractive-index crystals. We first demonstrate both experimentally and numerically how, when two nanodimples are separated by intermediate distances (700–1000 nm), near-field interference can take place resulting in a near-field enhancement between nanodimples. Based on this effect, near-field enhancements close to 60% are then demonstrated at the center of nanodimple arrays, and strong optical contrasts in excess of 100% are produced. The integration of these arrays into crystal substrates provides a versatile tool for new optical trapping and evanescent-field nanosensing devices.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-010-4218-0