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 journalArticlepeer-review

21 Scopus citations


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
Issue number13
StatePublished - 2019

Bibliographical note

Funding Information:
National Research Foundation of Korea (NRF) (Global Frontier Program CAMM-2014M3A6B3063700, 2019M3A6B3030638, and 2017R1E1A1A01075394); KIST intramural grants (2E29490 and 2V06780).

Publisher Copyright:
© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.


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