Tunable and flexible deep-ultraviolet bandpass filters based on micro- and nanoparticle/polydimethylsiloxane hybrid membranes

Junfeng Zhu, Lei Wan, Chenxi Zhao, Ryo Sakai, Yuya Mikami, Tianhua Feng, Cong Chen, Weiping Liu, Hiroaki Yoshioka, Zhaohui Li, Yuji Oki

Research output: Contribution to journalArticlepeer-review

Abstract

Deep-ultraviolet (DUV) bandpass filters play an important role in the fields of modern environmental disinfection and sterilization. A novel low-cost optical scattering material that can be used to manufacture flexible DUV bandpass filters is proposed. Considering both the refractive index matching condition and Rayleigh-Gans-Debye (RGD) scattering theory, the calcium fluoride (CaF2)-doped polydimethylsiloxane (PDMS) DUV bandpass filter shows over 90% transmittance near the peak wavelength of 272.5 nm. Strain measurements result in relatively stable peak wavelengths with stretching ratios of 12%. A temperature response of 1.5 nm °C−1 is measured experimentally. To simulate the DUV light filtering characteristics of the device, an improved random walk scattering model is developed based on a Monte Carlo numerical simulation. To verify the tunability of the transmittance spectra of the devices, a 10 nm blueshift of the peak wavelength is obtained by doping 50 vol% low-molecular-weight PDMS in the original PDMS matrix, and a 17 nm redshift is observed upon doping 1.4 wt% CdSe/ZnS colloidal quantum dots (CQDs). The realization of tunable and flexible DUV bandpass filters paves the way towards the development of environmental purification equipment and wearable photonic devices.

Original languageEnglish
Article number111073
JournalOptical Materials
Volume115
DOIs
Publication statusPublished - May 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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