Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 52,
  • Issue 12,
  • pp. 1493-1497
  • (1998)

Extremely Large Enhancement Factors in Surface-Enhanced Raman Scattering for Molecules on Colloidal Gold Clusters

Not Accessible

Your library or personal account may give you access

Abstract

In agreement with previous results reported for colloidal silver clusters, effective surface-enhanced Raman cross sections of about 10-16 cm2 per molecule, corresponding to enhancement factors on the order of 10 14, have also been obtained for molecules attached to colloidal gold clusters. Spatially isolated nearly spherical colloidal gold particles of about 60 nm size show maximum enhancement factors on the order of 103 at 514 nm excitation, close to the single plasmon resonance. The enhancement factor increases by eleven orders of magnitude when colloidal gold clusters are formed by aggregation of the gold colloids and when near-infrared excitation is applied. The large effective surface-enhanced Raman cross section has been estimated by a straightforward method based on steady-state population redistribution due to the pumping of molecules to the first excited vibrational state via the strongly enhanced Raman process. Our experimental finding confirms the important role of colloidal clusters for extremely large surface-enhanced Raman scattering (SERS) enhancement factors. Simultaneously, it suggests colloidal gold clusters as a substrate for high-sensitivity surface-enhanced Raman scattering, which can provide an enhancement level sufficient for Raman single molecule detection. Due to its chemical inactivity, gold might have some advantages compared to silver, particularly in biomedical spectroscopy.

PDF Article
More Like This
Doubly resonant surface-enhanced Raman scattering on gold nanorod decorated inverse opal photonic crystals

Le Dac Tuyen, An Chi Liu, Chia-Chi Huang, Pei-Cheng Tsai, Jian Hung Lin, Chin-Wei Wu, Lai-Kwan Chau, Tzyy Schiuan Yang, Le Quoc Minh, Hung-Chih Kan, and Chia Chen Hsu
Opt. Express 20(28) 29266-29275 (2012)

Method of optical manipulation of gold nanoparticles for surface-enhanced Raman scattering in a microcavity

Kun Xin, Xiaofeng Shi, Yi Liu, Zimeng Zhang, Wenjie Jia, and Jun Ma
Opt. Express 28(6) 8734-8743 (2020)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved