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|Title:||Phase-change-material-based low-loss visible-frequency hyperbolic metamaterials for ultrasensitive label-free biosensing||Authors:||Sreekanth, Kandammathe Valiyaveedu
Lim, Chwee Teck
Simpson, Robert E.
|Keywords:||Science::Physics||Issue Date:||2019||Source:||Sreekanth, K. V., Ouyang, Q., Sreejith, S., Zeng, S., Wu, L., Ilker, E., Dong, W., Mohamed ElKabbash, Yu, T., Lim, C. T., Hinczewski, M., Strangi, G., Yong, K., Simpson, R. E. & Singh, R. (2019). Phase-change-material-based low-loss visible-frequency hyperbolic metamaterials for ultrasensitive label-free biosensing. Advanced Optical Materials, 7(12), 1900081-. https://dx.doi.org/10.1002/adom.201900081||Project:||MOE2015-T2-2-103||Journal:||Advanced Optical Materials||Abstract:||Hyperbolic metamaterials (HMMs) have emerged as a burgeoning field of research over the past few years as their dispersion can be easily engineered in different spectral regions using various material combinations. Even though HMMs have comparatively low optical loss due to a single resonance, the noble-metal-based HMMs are limited by their strong energy dissipation in metallic layers at visible frequencies. Here, the fabrication of noble-metal-free reconfigurable HMMs for visible photonic applications is experimentally demonstrated. The low-loss and active HMMs are realized by combining titanium nitride (TiN) and stibnite (Sb₂S₃) as the phase change material. A reconfigurable plasmonic biosensor platform based on active Sb₂S₃–TiN HMMs is proposed, and it is shown that significant improvement in sensitivity is possible for small molecule detection at low concentrations. In addition, a plasmonic apta-biosensor based on a hybrid platform of graphene and Sb₂S₃–TiN HMM is developed and the detection and real-time binding of thrombin concentration as low as 1 × 10⁻¹⁵ m are demonstrated. A biosensor operating in the visible range has several advantages including the availability of sources and detectors in this region, and ease of operation particularly for point-of-care applications.||URI:||https://hdl.handle.net/10356/151670||ISSN:||2195-1071||DOI:||10.1002/adom.201900081||DOI (Related Dataset):||10.21979/N9/JPRKXS||Rights:||This is the peer reviewed version of the following article: Sreekanth, K. V., Ouyang, Q., Sreejith, S., Zeng, S., Wu, L., Ilker, E., Dong, W., Mohamed ElKabbash, Yu, T., Lim, C. T., Hinczewski, M., Strangi, G., Yong, K., Simpson, R. E. & Singh, R. (2019). Phase-change-material-based low-loss visible-frequency hyperbolic metamaterials for ultrasensitive label-free biosensing. Advanced Optical Materials, 7(12), 1900081-, which has been published in final form at https://doi.org/10.1002/adom.201900081. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
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