Terahertz optical characteristics of two types of metamaterials for molecule sensing

Yeeun Roh, Sang Hun Lee, Boyoung Kang, Jeong Weon Wu, Byeong Kwon Ju, Minah Seo

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We investigate spectral responses of two different terahertz (THz) metamaterials of double split ring resonator (DSRR) and the nano slot resonator (NSR) for molecule sensing in low concentration. Two different resonant frequencies of DSRR can be controlled by polarization angle of incident THz beam. For comparison of THz optical characteristics, two NSRs were made as showing the same resonant frequencies as DSRR’s multimode. The monosaccharide molecules of glucose and galactose were detected by these two types of metamaterials matching the resonant frequencies in various concentration. NSR shows higher sensitivity in very low concentration range rather than DSRR, although the behavior was easily saturated in terms of concentration. In contrast, DSRR can cover more broad concentration range with clear linearity especially under high quality factor mode in polarization of 67.5 degree due to the Fano resonance. THz field enhancement distributions were calculated to investigate sensing performance of both sensing chips in qualitative and quantitative manner.

Original languageEnglish
Pages (from-to)19042-19049
Number of pages8
JournalOptics Express
Volume27
Issue number13
DOIs
Publication statusPublished - 2019 Jan 1

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resonators
resonant frequencies
molecules
rings
slots
low concentrations
monosaccharides
galactose
polarization
spectral sensitivity
glucose
linearity
Q factors
chips
augmentation
sensitivity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Terahertz optical characteristics of two types of metamaterials for molecule sensing. / Roh, Yeeun; Lee, Sang Hun; Kang, Boyoung; Wu, Jeong Weon; Ju, Byeong Kwon; Seo, Minah.

In: Optics Express, Vol. 27, No. 13, 01.01.2019, p. 19042-19049.

Research output: Contribution to journalArticle

Roh, Yeeun ; Lee, Sang Hun ; Kang, Boyoung ; Wu, Jeong Weon ; Ju, Byeong Kwon ; Seo, Minah. / Terahertz optical characteristics of two types of metamaterials for molecule sensing. In: Optics Express. 2019 ; Vol. 27, No. 13. pp. 19042-19049.
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