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A tunable nano-optofluidic polymer optical filter based on guided-mode resonance

Research output: Contribution to journalJournal articlepeer-review

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  • Guohui Xiao
  • Qiangzhong Zhu
  • Yang Shen
  • Kezheng Li
  • Mingkai Liu
  • Qiandong Zhuang
  • Chongjun Jin
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<mark>Journal publication date</mark>28/02/2015
<mark>Journal</mark>Nanoscale
Issue number8
Volume7
Number of pages6
Pages (from-to)3429-3434
Publication StatusPublished
Early online date19/01/15
<mark>Original language</mark>English

Abstract

Optical filters with reconfigurable spectral properties are highly desirable in a wide range of applications. We propose and experimentally demonstrate a tunable submicro-optofluidic polymer guided-mode resonance (PGMR) filter. The device is composed of a periodic grating sandwiched between a high index waveguide layer and a low index capping layer, which integrates submicro-fluidic channel arrays and a PGMR filter elegantly. A finite difference time domain (FDTD) method is employed to understand the spectral properties and determine appropriate device parameters. We fabricated the polymer guided-mode resonance filter with a method combining two-beam interference lithography, floating nanofilm transfer and thermal bonding techniques. Experimental results show that our tunable submicro-optofluidic PGMR filters can provide a broad spectral tuning range (13.181 nm), a narrow bandwidth (<2.504 nm), and a high reflection efficiency (>85%) in the visible region. Such submicro-optofluidic PGMR filters are highly compatible with existing nano/microfluidic technologies and would be valuable for the integrated flexible optical system.