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Title of Journal: J Nanopart Res

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Abbravation: Journal of Nanoparticle Research

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Springer Netherlands

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DOI

10.1002/art.1780080115

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1572-896X

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Optimized spacer layer thickness for plasmonicind

Authors: Z M Saleh H Nasser E Özkol M Günöven K Abak S Canli A Bek R Turan
Publish Date: 2015/10/24
Volume: 17, Issue: 10, Pages: 419-
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Abstract

Plasmonic interfaces consisting of silver nanoparticles of different sizes 50–100 nm have been processed by the selfassembled dewetting technique and integrated to hydrogenated amorphous silicon aSiH using SiNx spacer layers to investigate the dependence of optical trapping enhancement on spacer layer thickness through the enhancements in photocurrent Samples illuminated from the aSiH side exhibit a localized surface plasmon resonance LSPR that is redshifted with the increasing particle size and broadened into the red with the increasing spacer layer thickness The photocurrent measured in aSiH is not only consistent with the redshift and broadening of the LSPR but exhibits critical dependence on the spacer layer thickness also The samples with plasmonic interfaces and a SiNx spacer layer exhibit appreciable enhancement of photocurrent compared with flat aSiH reference depending on the size of the Ag nanoparticle Simulations conducted on onedimensional square structures exhibit electric fields that are localized near the plasmonic structures but extend appreciably into the higher refractive index aSiH These simulations produce a clear redshift and broadening of extinction spectra for all spacer layer thicknesses and predict an enhancement in photocurrent in agreement with experimental results The spectral dependence of photocurrent for six plasmonic interfaces with different Ag nanoparticle sizes and spacer layer thicknesses are correlated with the optical spectra and compared with the simulations to predict an optimal spacer layer thicknessR T acknowledges the support by the Scientific and Technological Research Council of Turkey TUBITAK under joint project with BMBF and Rainbow Energy per the contract number 109R037 A B is grateful to The Scientific and Technological Research Council of Turkey TUBITAK for their support under Grant numbers 113F239 113F375 and 113M931 ZM Saleh acknowledges the support from the Scientific and Technological Research Council of Turkey TUBITAK BIDEB2221 program H Nasser acknowledges the support from the Scientific and Technological Research Council of Turkey TUBITAK BIDEB2215 program

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