Plasmon Enhancement of Emission and Absorption by CdSe-based Nanocrystals

Alexander Milekhin,Mahfujur Rahaman,Ilya Milekhin, Lyudmila Basalaeva,Tatyana Duda,Ekaterina Rodyakina,Kirill Anikin,Roman Vasiliev,Sergei A. Kuznetsov,Alexander Latyshev,Dietrich Zahn

2021 46TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES (IRMMW-THZ)（2021）

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Abstract

We report on the resonant plasmon enhancement Raman scattering (RS), photoluminescence (PL), and IR absorption by colloidal CdSe-based nanocrystals deposited on Au nanodisk and nanoantenna arrays. Numerical simulations were applied to calculate structural parameters of nanodisks and nanoantennas for which local surface plasmon resonance (LSPR) energy coincides with interband transition energies and surface optical (SO) phonon energies in NCs, correspondingly. The enhancement factors of RS and PL depend resonantly on the nanodisk size. Tip-Enhanced Raman Scattering (TERS) imaging allowed us to carry out the local spectral analysis of CdSe NCs with nanometer spatial resolution. A design of H-type nanoantennas was chosen to achieve maximal enhanced absorption by SO phonons from 1 monolayer of NCs.

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Key words

resonant plasmon enhancement Raman scattering,photoluminescence,infrared absorption,nanoantenna arrays,numerical simulations,structural parameters,gold nanodisks,interband transition energy,enhancement factors,nanodisk size,local spectral analysis,H-type nanoantennas,maximal enhanced absorption,colloidal cadmium selenide-based nanocrystals,local surface plasmon resonance energy,surface optical phonon energy,monolayer,CdSe-Au

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