Randomly-grown high-dielectric-constant ZnO nanorods for near-field enhanced Raman scattering

Mitsuhiro Terakawa, Yuto Tanaka, Go Obara, Tatsunori Sakano, Minoru Obara

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We investigate the dependence of the size parameter in the Mie scattering theory on the near-field enhanced Raman scattering properties for high dielectric constant ZnO nanorods grown randomly by PLD (pulsed laser deposition). High Raman signals of Rhodamine 6G (R6G) at 532 nm excitation wavelength were observed with nanorods of 400 nm average diameter. This experimental result was explained theoretically by the size parameter described in the Mie scattering theory, not by surface plasmon polaritons. This was also confirmed by the near-field distribution calculated by the FDTD (Finite-Difference Time Domain) method. The ZnO nanorods with 400 nm average diameter can detect as low as 1 μM of R6G. This near-field enhancement factor is equivalent to that with 10-nm-thick goldcoated ZnO nanorods (nanoshells) with an average core diameter of 100 nm. Controlling the diameter of bare ZnO nanorods is effective for obtaining large enhancement factors without an additional process of gold thin film coating on them.

Original languageEnglish
Pages (from-to)661-665
Number of pages5
JournalApplied Physics A: Materials Science and Processing
Volume102
Issue number3
DOIs
Publication statusPublished - 2011 Mar

Fingerprint

Nanorods
Raman scattering
Permittivity
Scattering
Nanoshells
Finite difference time domain method
Pulsed laser deposition
Gold
Thin films
Coatings
Wavelength
rhodamine 6G

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemistry(all)

Cite this

Randomly-grown high-dielectric-constant ZnO nanorods for near-field enhanced Raman scattering. / Terakawa, Mitsuhiro; Tanaka, Yuto; Obara, Go; Sakano, Tatsunori; Obara, Minoru.

In: Applied Physics A: Materials Science and Processing, Vol. 102, No. 3, 03.2011, p. 661-665.

Research output: Contribution to journalArticle

Terakawa, Mitsuhiro ; Tanaka, Yuto ; Obara, Go ; Sakano, Tatsunori ; Obara, Minoru. / Randomly-grown high-dielectric-constant ZnO nanorods for near-field enhanced Raman scattering. In: Applied Physics A: Materials Science and Processing. 2011 ; Vol. 102, No. 3. pp. 661-665.
@article{4affdf9754084c5ea66d0e22f7cfecf9,
title = "Randomly-grown high-dielectric-constant ZnO nanorods for near-field enhanced Raman scattering",
abstract = "We investigate the dependence of the size parameter in the Mie scattering theory on the near-field enhanced Raman scattering properties for high dielectric constant ZnO nanorods grown randomly by PLD (pulsed laser deposition). High Raman signals of Rhodamine 6G (R6G) at 532 nm excitation wavelength were observed with nanorods of 400 nm average diameter. This experimental result was explained theoretically by the size parameter described in the Mie scattering theory, not by surface plasmon polaritons. This was also confirmed by the near-field distribution calculated by the FDTD (Finite-Difference Time Domain) method. The ZnO nanorods with 400 nm average diameter can detect as low as 1 μM of R6G. This near-field enhancement factor is equivalent to that with 10-nm-thick goldcoated ZnO nanorods (nanoshells) with an average core diameter of 100 nm. Controlling the diameter of bare ZnO nanorods is effective for obtaining large enhancement factors without an additional process of gold thin film coating on them.",
author = "Mitsuhiro Terakawa and Yuto Tanaka and Go Obara and Tatsunori Sakano and Minoru Obara",
year = "2011",
month = "3",
doi = "10.1007/s00339-010-6107-0",
language = "English",
volume = "102",
pages = "661--665",
journal = "Applied Physics",
issn = "0340-3793",
publisher = "Springer Verlag",
number = "3",

}

TY - JOUR

T1 - Randomly-grown high-dielectric-constant ZnO nanorods for near-field enhanced Raman scattering

AU - Terakawa, Mitsuhiro

AU - Tanaka, Yuto

AU - Obara, Go

AU - Sakano, Tatsunori

AU - Obara, Minoru

PY - 2011/3

Y1 - 2011/3

N2 - We investigate the dependence of the size parameter in the Mie scattering theory on the near-field enhanced Raman scattering properties for high dielectric constant ZnO nanorods grown randomly by PLD (pulsed laser deposition). High Raman signals of Rhodamine 6G (R6G) at 532 nm excitation wavelength were observed with nanorods of 400 nm average diameter. This experimental result was explained theoretically by the size parameter described in the Mie scattering theory, not by surface plasmon polaritons. This was also confirmed by the near-field distribution calculated by the FDTD (Finite-Difference Time Domain) method. The ZnO nanorods with 400 nm average diameter can detect as low as 1 μM of R6G. This near-field enhancement factor is equivalent to that with 10-nm-thick goldcoated ZnO nanorods (nanoshells) with an average core diameter of 100 nm. Controlling the diameter of bare ZnO nanorods is effective for obtaining large enhancement factors without an additional process of gold thin film coating on them.

AB - We investigate the dependence of the size parameter in the Mie scattering theory on the near-field enhanced Raman scattering properties for high dielectric constant ZnO nanorods grown randomly by PLD (pulsed laser deposition). High Raman signals of Rhodamine 6G (R6G) at 532 nm excitation wavelength were observed with nanorods of 400 nm average diameter. This experimental result was explained theoretically by the size parameter described in the Mie scattering theory, not by surface plasmon polaritons. This was also confirmed by the near-field distribution calculated by the FDTD (Finite-Difference Time Domain) method. The ZnO nanorods with 400 nm average diameter can detect as low as 1 μM of R6G. This near-field enhancement factor is equivalent to that with 10-nm-thick goldcoated ZnO nanorods (nanoshells) with an average core diameter of 100 nm. Controlling the diameter of bare ZnO nanorods is effective for obtaining large enhancement factors without an additional process of gold thin film coating on them.

UR - http://www.scopus.com/inward/record.url?scp=79959341947&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79959341947&partnerID=8YFLogxK

U2 - 10.1007/s00339-010-6107-0

DO - 10.1007/s00339-010-6107-0

M3 - Article

AN - SCOPUS:79959341947

VL - 102

SP - 661

EP - 665

JO - Applied Physics

JF - Applied Physics

SN - 0340-3793

IS - 3

ER -