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IJAT Vol.11 No.5 pp. 772-780
doi: 10.20965/ijat.2017.p0772
(2017)

Paper:

A Simulation Study of Plasmonic Substrate for In-Process Measurement of Refractive Index in Nano-Stereolithography

Masaki Michihata*,†, Deqing Kong**, Kiyoshi Takamasu***, and Satoru Takahashi*

*Research Center for Advanced Science and Technology, The University of Tokyo
4-6-1 Komaba, Meguro, Tokyo 153-8904, Japan

Corresponding author

**Department of Advanced Interdisciplinary Studies, The University of Tokyo, Tokyo, Japan

***Department of Precision Engineering, The University of Tokyo, Tokyo, Japan

Received:
January 13, 2017
Accepted:
June 27, 2017
Online released:
August 30, 2017
Published:
September 5, 2017
Keywords:
in-process measurement, surface plasmon resonance, stereolithography, PLZT, refractive index
Abstract

Functional surfaces are in demand for recent value-added products. Stereolithography based on evanescent light has been proposed as a technique to fabricate surface nanostructures, but some fabrication error sources must be addressed. In-process measurement is an essential solution to improve the fabrication performance. For in-process measurement in stereolithography, the refractive index of resin is an inherent parameter for product and condition monitoring. This study proposes the in-process measurement of the refractive index of resin based on surface plasmon resonance (SPR). The optical phase response at SPR is highly sensitive to changes in the refractive index of resin but has a narrow sensing range. Therefore, we propose a substrate with a tunable sensing range using lanthanum-modified lead zirconate titanate (PLZT). The structural design was considered using numerical simulation. The SPR conditions were calculated with regard to thickness combinations of PLZT and metal (Ag) films. Depending on these combinations, a sensing range can be tuned on the order of 10-3 to 10-4 RIU with a sensitivity of 106 rad/RIU. However, to realize these performances, the manufacturing accuracy of Ag thin films must be better than 0.1 nm.

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Last updated on Sep. 19, 2017