Gold Elliptic Nanocavity Array Biosensor With High Refractive Index Sensitivity Based on Two-Photon Nanolithography

Author

Jun Yuan ; Hong-Zhong Cao ; Yi-Yang Xie ; Zhao-Xin Geng ; Qiang Kan ; Xuan-Ming Duan ; Hong-Da Chen

Author_Institution

State Key Lab. of Integrated Optoelectron., Inst. of Semicond., Beijing, China

Volume

7

Issue

1

fYear

2015

fDate

Feb. 2015

Firstpage

1

Lastpage

8

Abstract

Metallic nanostructure arrays have been highlighted by their tremendously promising applications, such as biosensors, light harvesting, and fluorescence enhancement. To reach the aim of obtaining an inexpensive gold elliptic nanocavity array (GENA) biosensor, which has high refractive index sensitivity, the two-photon nanolithography, with the advantages of high resolution, low cost, time-saving, etc., is used to fabricate GENAs. The characteristics of these GENA biosensors are experimentally and theoretically investigated. A finite-difference time-domain method is applied to analyze the GENAs´ localized surface plasmon resonance modes in the transmission spectra of GENAs and steady-state field intensity distributions. The refractive index sensitivities of the GENAs are characterized by the transmission spectra of GENAs in water and varied concentrations of NaCl solution. The results illustrate that the GENA biosensor under coupled mode sensing has high refractive index sensitivity, which reaches 562 nm/RIU.

Keywords

finite difference time-domain analysis; gold; nanolithography; nanophotonics; nanosensors; refractive index; sensor arrays; surface plasmon resonance; two-photon processes; Au; GENA biosensors; GENAs localized surface plasmon resonance modes; NaCl solution; finite-difference time-domain method; fluorescence enhancement; gold elliptic nanocavity array biosensor; high-refractive index sensitivity; inexpensive gold elliptic nanocavity array biosensor; light harvesting; metallic nanostructure arrays; steady-state field intensity distributions; transmission spectra; two-photon nanolithography; water; Biosensors; Electric fields; Gold; Nanostructures; Refractive index; Sensitivity; Two-photon nanolithography; biosensor; coupled mode; gold elliptic nanocavity arrays; two-photon nanolithography;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2014.2366167

Filename

6942147