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Sub-diffraction thin-film sensing with planar terahertz metamaterials

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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Sub-diffraction thin-film sensing with planar terahertz metamaterials. / Withayachumnankul, W.; Lin, Hungyen; Serita, Kazunori et al.
In: Optics Express, Vol. 20, No. 3, 2012, p. 3345-3352.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Withayachumnankul, W, Lin, H, Serita, K, Shah, CM, Sriram, S, Bhaskaran, M, Tonouchi, M, Fumeaux, C & Abbott, D 2012, 'Sub-diffraction thin-film sensing with planar terahertz metamaterials', Optics Express, vol. 20, no. 3, pp. 3345-3352. https://doi.org/10.1364/OE.20.003345

APA

Withayachumnankul, W., Lin, H., Serita, K., Shah, C. M., Sriram, S., Bhaskaran, M., Tonouchi, M., Fumeaux, C., & Abbott, D. (2012). Sub-diffraction thin-film sensing with planar terahertz metamaterials. Optics Express, 20(3), 3345-3352. https://doi.org/10.1364/OE.20.003345

Vancouver

Withayachumnankul W, Lin H, Serita K, Shah CM, Sriram S, Bhaskaran M et al. Sub-diffraction thin-film sensing with planar terahertz metamaterials. Optics Express. 2012;20(3):3345-3352. doi: 10.1364/OE.20.003345

Author

Withayachumnankul, W. ; Lin, Hungyen ; Serita, Kazunori et al. / Sub-diffraction thin-film sensing with planar terahertz metamaterials. In: Optics Express. 2012 ; Vol. 20, No. 3. pp. 3345-3352.

Bibtex

@article{dc691a2bf8954d669336670ed73aee99,
title = "Sub-diffraction thin-film sensing with planar terahertz metamaterials",
abstract = "Planar metamaterials consisting of subwavelength resonators have been recently proposed for thin dielectric film sensing in the terahertz frequency range. Although the thickness of the dielectric film can be very small compared with the wavelength, the required area of sensed material is still determined by the diffraction-limited spot size of the terahertz beam excitation. In this article, terahertz near-field sensing is utilized to reduce the spot size. By positioning the metamaterial sensing platform close to the sub-diffraction terahertz source, the number of excited resonators, and hence minimal film area, are significantly reduced. As an additional advantage, a reduction in the number of excited resonators decreases the inter-cell coupling strength, and consequently the resonance Q factor is remarkably increased. The experimental results show that the resonance Q factor is improved by more than a factor of two compared to the far-field measurement. Moreover, for a film with a thickness of λ/375 the minimal area can be as small as 0.2λ × 0.2λ. The success of this work provides a platform for future metamaterial-based sensors for biomolecular detection.",
author = "W. Withayachumnankul and Hungyen Lin and Kazunori Serita and Shah, {Charan M.} and Sharath Sriram and Madhu Bhaskaran and Masayoshi Tonouchi and Christophe Fumeaux and Derek Abbott",
year = "2012",
doi = "10.1364/OE.20.003345",
language = "English",
volume = "20",
pages = "3345--3352",
journal = "Optics Express",
issn = "1094-4087",
publisher = "Optical Society of American (OSA)",
number = "3",

}

RIS

TY - JOUR

T1 - Sub-diffraction thin-film sensing with planar terahertz metamaterials

AU - Withayachumnankul, W.

AU - Lin, Hungyen

AU - Serita, Kazunori

AU - Shah, Charan M.

AU - Sriram, Sharath

AU - Bhaskaran, Madhu

AU - Tonouchi, Masayoshi

AU - Fumeaux, Christophe

AU - Abbott, Derek

PY - 2012

Y1 - 2012

N2 - Planar metamaterials consisting of subwavelength resonators have been recently proposed for thin dielectric film sensing in the terahertz frequency range. Although the thickness of the dielectric film can be very small compared with the wavelength, the required area of sensed material is still determined by the diffraction-limited spot size of the terahertz beam excitation. In this article, terahertz near-field sensing is utilized to reduce the spot size. By positioning the metamaterial sensing platform close to the sub-diffraction terahertz source, the number of excited resonators, and hence minimal film area, are significantly reduced. As an additional advantage, a reduction in the number of excited resonators decreases the inter-cell coupling strength, and consequently the resonance Q factor is remarkably increased. The experimental results show that the resonance Q factor is improved by more than a factor of two compared to the far-field measurement. Moreover, for a film with a thickness of λ/375 the minimal area can be as small as 0.2λ × 0.2λ. The success of this work provides a platform for future metamaterial-based sensors for biomolecular detection.

AB - Planar metamaterials consisting of subwavelength resonators have been recently proposed for thin dielectric film sensing in the terahertz frequency range. Although the thickness of the dielectric film can be very small compared with the wavelength, the required area of sensed material is still determined by the diffraction-limited spot size of the terahertz beam excitation. In this article, terahertz near-field sensing is utilized to reduce the spot size. By positioning the metamaterial sensing platform close to the sub-diffraction terahertz source, the number of excited resonators, and hence minimal film area, are significantly reduced. As an additional advantage, a reduction in the number of excited resonators decreases the inter-cell coupling strength, and consequently the resonance Q factor is remarkably increased. The experimental results show that the resonance Q factor is improved by more than a factor of two compared to the far-field measurement. Moreover, for a film with a thickness of λ/375 the minimal area can be as small as 0.2λ × 0.2λ. The success of this work provides a platform for future metamaterial-based sensors for biomolecular detection.

U2 - 10.1364/OE.20.003345

DO - 10.1364/OE.20.003345

M3 - Journal article

VL - 20

SP - 3345

EP - 3352

JO - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 3

ER -