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Sensors 2011, 11(9), 8358-8369; doi:10.3390/s110908358
Article

A Fusion-Spliced Near-Field Optical Fiber Probe Using Photonic Crystal Fiber for Nanoscale Thermometry Based on Fluorescence-Lifetime Measurement of Quantum Dots

1,* , 2
,
3
 and
2
1 School of Integrated Design Engineering, Keio University, Kanagawa 223-8522, Japan 2 Department of System Design Engineering, Keio University, Kanagawa 223-8522, Japan 3 Department of Electronics and Electrical Engineering, Keio University, Kanagawa 223-8522, Japan
* Author to whom correspondence should be addressed.
Received: 18 July 2011 / Revised: 22 August 2011 / Accepted: 22 August 2011 / Published: 29 August 2011
(This article belongs to the Special Issue Sensing with Quantum Dots)
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Abstract

We have developed a novel nanoscale temperature-measurement method using fluorescence in the near-field called Fluorescence Near-field Optics Thermal Nanoscopy (Fluor-NOTN). Fluor-NOTN enables the temperature distributions of nanoscale materials to be measured in vivo/in situ. The proposed method measures temperature by detecting the temperature dependent fluorescence lifetimes of Cd/Se Quantum Dots (QDs). For a high-sensitivity temperature measurement, the auto-fluorescence generated from a fiber probe should be reduced. In order to decrease the noise, we have fabricated a novel near-field optical-fiber probe by fusion-splicing a photonic crystal fiber (PCF) and a conventional single-mode fiber (SMF). The validity of the novel fiber probe was assessed experimentally by evaluating the auto-fluorescence spectra of the PCF. Due to the decrease of auto-fluorescence, a six- to ten-fold increase of S/N in the near-field fluorescence lifetime detection was achieved with the newly fabricated fusion-spliced near-field optical fiber probe. Additionally, the near-field fluorescence lifetime of the quantum dots was successfully measured by the fabricated fusion-spliced near-field optical fiber probe at room temperature, and was estimated to be 10.0 ns.
Keywords: near-field optics; photonic crystal fiber; quantum dots; thermometry near-field optics; photonic crystal fiber; quantum dots; thermometry
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Fujii, T.; Taguchi, Y.; Saiki, T.; Nagasaka, Y. A Fusion-Spliced Near-Field Optical Fiber Probe Using Photonic Crystal Fiber for Nanoscale Thermometry Based on Fluorescence-Lifetime Measurement of Quantum Dots. Sensors 2011, 11, 8358-8369.

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