Terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces
The fingerprint spectral response of several materials with terahertz electromagnetic radiation indicates that terahertz technology is an effective tool for sensing applications. However, sensing few nanometer thin-films of dielectrics with much longer terahertz waves (1 THz = 0.3 mm) is challenging...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Online Access: | https://hdl.handle.net/10356/138451 |
| _version_ | 1826126030618755072 |
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| author | Srivastava, Yogesh Kumar Ako, Rajour Tanyi Gupta, Manoj Bhaskaran, Madhu Sriram, Sharath Singh, Ranjan |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Srivastava, Yogesh Kumar Ako, Rajour Tanyi Gupta, Manoj Bhaskaran, Madhu Sriram, Sharath Singh, Ranjan |
| author_sort | Srivastava, Yogesh Kumar |
| collection | NTU |
| description | The fingerprint spectral response of several materials with terahertz electromagnetic radiation indicates that terahertz technology is an effective tool for sensing applications. However, sensing few nanometer thin-films of dielectrics with much longer terahertz waves (1 THz = 0.3 mm) is challenging. Here, we demonstrate a quasibound state in the continuum (BIC) resonance for sensing of a nanometer scale thin analyte deposited on a flexible metasurface. The large sensitivity originates from the strong local field confinement of the quasi-BIC Fano resonance state and extremely low absorption loss of a low-index cyclic olefin copolymer substrate. A minimum thickness of 7 nm thin-film of germanium is sensed on the metasurface, which corresponds to a deep subwavelength scale of λ/43 000, where λ is the resonance wavelength. The low-loss, flexible, and large mechanical strength of the quasi-BIC microstructured metamaterial sensor could be an ideal platform for developing ultrasensitive wearable terahertz sensors. |
| first_indexed | 2024-10-01T06:46:04Z |
| format | Journal Article |
| id | ntu-10356/138451 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:46:04Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1384512023-02-28T19:53:32Z Terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces Srivastava, Yogesh Kumar Ako, Rajour Tanyi Gupta, Manoj Bhaskaran, Madhu Sriram, Sharath Singh, Ranjan School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies The Photonics Institute Science::Physics Sensing Bound State in the Continumm The fingerprint spectral response of several materials with terahertz electromagnetic radiation indicates that terahertz technology is an effective tool for sensing applications. However, sensing few nanometer thin-films of dielectrics with much longer terahertz waves (1 THz = 0.3 mm) is challenging. Here, we demonstrate a quasibound state in the continuum (BIC) resonance for sensing of a nanometer scale thin analyte deposited on a flexible metasurface. The large sensitivity originates from the strong local field confinement of the quasi-BIC Fano resonance state and extremely low absorption loss of a low-index cyclic olefin copolymer substrate. A minimum thickness of 7 nm thin-film of germanium is sensed on the metasurface, which corresponds to a deep subwavelength scale of λ/43 000, where λ is the resonance wavelength. The low-loss, flexible, and large mechanical strength of the quasi-BIC microstructured metamaterial sensor could be an ideal platform for developing ultrasensitive wearable terahertz sensors. MOE (Min. of Education, S’pore) Accepted version 2020-05-06T06:03:10Z 2020-05-06T06:03:10Z 2019 Journal Article Srivastava, Y. K., Ako, R. T., Gupta, M., Bhaskaran, M., Sriram, S., & Singh, R. (2019). Terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces. Applied Physics Letters, 115(15), 151105-. doi:10.1063/1.5110383 0003-6951 https://hdl.handle.net/10356/138451 10.1063/1.5110383 15 115 en Ministry of Education AcRF Tier 1 grant RG191/17 Ministry of Education Tier 2 Grant No. MOE2017-T2-1-110 Applied Physics Letters https://doi.org/10.21979/N9/45EWUQ © 2019 The Author(s). All rights reserved. This paper was published by AIP in Applied Physics Letters and is made available with permission of The Author(s). application/pdf application/pdf |
| spellingShingle | Science::Physics Sensing Bound State in the Continumm Srivastava, Yogesh Kumar Ako, Rajour Tanyi Gupta, Manoj Bhaskaran, Madhu Sriram, Sharath Singh, Ranjan Terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces |
| title | Terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces |
| title_full | Terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces |
| title_fullStr | Terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces |
| title_full_unstemmed | Terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces |
| title_short | Terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces |
| title_sort | terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces |
| topic | Science::Physics Sensing Bound State in the Continumm |
| url | https://hdl.handle.net/10356/138451 |
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