TY - JOUR

T1 - Nanoantenna structures for the detection of phonons in nanocrystals

AU - Milekhin, Alexander G.

AU - Kuznetsov, Sergei A.

AU - Milekhin, Ilya A.

AU - Sveshnikova, Larisa L.

AU - Duda, Tatyana A.

AU - Rodyakina, Ekaterina E.

AU - Latyshev, Alexander V.

AU - Dzhagan, Volodymyr M.

AU - Zahn, Dietrich R.T.

N1 - Publisher Copyright: © 2018 Milekhin et al.

PY - 2018/10/5

Y1 - 2018/10/5

N2 - We report a study of the infrared response by localized surface plasmon resonance (LSPR) modes in gold micro- and nanoantenna arrays with various morphologies and surface-enhanced infrared absorption (SEIRA) by optical phonons of semiconductor nanocrystals (NCs) deposited on the arrays. The arrays of nano- and microantennas fabricated with nano- and photolithography reveal infrared-active LSPR modes of energy ranging from the mid to far-infrared that allow the IR response from very low concentrations of organic and inorganic materials deposited onto the arrays to be analyzed. The Langmuir-Blodgett technology was used for homogeneous deposition of CdSe, CdS, and PbS NC monolayers on the antenna arrays. The structural parameters of the arrays were confirmed by scanning electron microscopy. 3D full-wave electromagnetic simulations of the electromagnetic field distribution around the micro- and nanoantennas were employed to realize the maximal SEIRA enhancement for structural parameters of the arrays whereby the LSPR and the NC optical phonon energies coincide. The SEIRA experiments quantitatively confirmed the computational results. The maximum SEIRA enhancement was observed for linear nanoantennas with optimized structural parameters determined from the electromagnetic simulations. The frequency position of the feature's absorption seen in the SEIRA response evidences that the NC surface and transverse optical phonons are activated in the infrared spectra.

AB - We report a study of the infrared response by localized surface plasmon resonance (LSPR) modes in gold micro- and nanoantenna arrays with various morphologies and surface-enhanced infrared absorption (SEIRA) by optical phonons of semiconductor nanocrystals (NCs) deposited on the arrays. The arrays of nano- and microantennas fabricated with nano- and photolithography reveal infrared-active LSPR modes of energy ranging from the mid to far-infrared that allow the IR response from very low concentrations of organic and inorganic materials deposited onto the arrays to be analyzed. The Langmuir-Blodgett technology was used for homogeneous deposition of CdSe, CdS, and PbS NC monolayers on the antenna arrays. The structural parameters of the arrays were confirmed by scanning electron microscopy. 3D full-wave electromagnetic simulations of the electromagnetic field distribution around the micro- and nanoantennas were employed to realize the maximal SEIRA enhancement for structural parameters of the arrays whereby the LSPR and the NC optical phonon energies coincide. The SEIRA experiments quantitatively confirmed the computational results. The maximum SEIRA enhancement was observed for linear nanoantennas with optimized structural parameters determined from the electromagnetic simulations. The frequency position of the feature's absorption seen in the SEIRA response evidences that the NC surface and transverse optical phonons are activated in the infrared spectra.

KW - Localized surface plasmon resonance

KW - Metal nanoclusters

KW - Nanoantenna

KW - Phonons

KW - Semiconductor nanocrystals

KW - Surface-enhanced infrared absorption

KW - VIBRATIONAL-MODES

KW - RAMAN-SPECTROSCOPY

KW - metal nanoclusters

KW - nanoantenna

KW - ARRAYS

KW - MONOLAYERS

KW - QUANTUM DOTS

KW - surface-enhanced infrared absorption

KW - PLASMONIC ENHANCEMENT

KW - SHAPE

KW - localized surface plasmon resonance

KW - ENHANCED INFRARED-ABSORPTION

KW - SURFACE

KW - OPTICAL PHONONS

KW - phonons

KW - semiconductor nanocrystals

UR - http://www.scopus.com/inward/record.url?scp=85055722939&partnerID=8YFLogxK

U2 - 10.3762/bjnano.9.246

DO - 10.3762/bjnano.9.246

M3 - Article

C2 - 30416915

AN - SCOPUS:85055722939

VL - 9

SP - 2646

EP - 2656

JO - Beilstein Journal of Nanotechnology

JF - Beilstein Journal of Nanotechnology

SN - 2190-4286

ER -