Swelling of polydimethylsiloxane in toluene solutions on electromagnetic resonance of metamaterials

Wei Fan Chiang, Harry Miyosi Silalahi, Yuan Ming Liu, Yan Shou Lin, Tsung Hao Chang, Chia Rong Lee, Chia Yi Huang

Research output: Contribution to journalArticlepeer-review

Abstract

A simple method for detecting organic solutions with a similar refractive index using metamaterials that are deposited on polydimethylsiloxane (PDMS) films is proposed. Pure toluene is diluted with pure alcohol for making up toluene solutions with concentrations of 0.5 wt. % and 1.0 wt. %. The experimental results from terahertz time-domain spectroscopy depict that pure alcohol and the toluene solutions have a similar refractive index in the terahertz region. The spectra of the metamaterials that are exposed to the toluene solutions are redshifted from that of the metamaterial that is exposed to pure alcohol, and the resonance frequencies of the metamaterials decrease with the increase in the concentrations of the toluene solutions. This result arises from the fact that the swelling of the PDMS films in the toluene solutions extends the arms of the split ring resonators, changing the dimensions of the metamaterials. The minimum detectable concentration of the metamaterials is less than 0.5 wt. % when they are exposed to the toluene solutions. The metamaterials deposited on the PDMS films can detect the organic solutions with a similar refractive index, and so they have the potential to sense organic gases with low concentrations.

Original languageEnglish
Article number211901
JournalApplied Physics Letters
Volume115
Issue number21
DOIs
Publication statusPublished - 2019 Nov 18

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Swelling of polydimethylsiloxane in toluene solutions on electromagnetic resonance of metamaterials'. Together they form a unique fingerprint.

Cite this