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https://doi.org/10.1021/acsami.9b18002
Title: | Ultrasensitive Transmissive Infrared Spectroscopy via Loss Engineering of Metallic Nanoantennas for Compact Devices | Authors: | WEI JINGXUAN Li, Ying CHANG YUHUA Hasan, Dihan Md Nuruddin DONG BOWEI MA YIMING QIU CHENGWEI LEE CHENGKUO |
Keywords: | Science & Technology Technology Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science nanoantennas infrared spectroscopy metamaterials mid-infrared coupled-mode theory PLASMONIC ENHANCEMENT ABSORPTION ANTENNAS METAMATERIAL NANOSLITS PLATFORM MODES |
Issue Date: | 18-Dec-2019 | Publisher: | AMER CHEMICAL SOC | Citation: | WEI JINGXUAN, Li, Ying, CHANG YUHUA, Hasan, Dihan Md Nuruddin, DONG BOWEI, MA YIMING, QIU CHENGWEI, LEE CHENGKUO (2019-12-18). Ultrasensitive Transmissive Infrared Spectroscopy via Loss Engineering of Metallic Nanoantennas for Compact Devices. ACS APPLIED MATERIALS & INTERFACES 11 (50) : 47270-47278. ScholarBank@NUS Repository. https://doi.org/10.1021/acsami.9b18002 | Abstract: | Copyright © 2019 American Chemical Society. Miniaturized infrared spectroscopy is highly desired for widespread applications, including environment monitoring, chemical analysis, and biosensing. Nanoantennas, as a promising approach, feature strong field enhancement and provide opportunities for ultrasensitive molecule detection even in the nanoscale range. However, current efforts for higher sensitivities by nanogaps usually suffer a trade-off between the performance and fabrication cost. Here, novel crooked nanoantennas are designed with a different paradigm based on loss engineering to overcome the above bottleneck. Compared to the commonly used straight nanoantennas, the crooked nanoantennas feature higher sensitivity and a better fabrication tolerance. Molecule signals are increased by 25 times, reaching an experimental enhancement factor of 2.8 × 104. The optimized structure enables a transmissive CO2 sensor with sensitivities up to 0.067% ppm-1. More importantly, such a performance is achieved without sub-100 nm structures, which are common in previous works, enabling compatibility with commercial optical lithography. The mechanism of our design can be explained by the interplay of radiative and absorptive losses of nanoantennas that obeys the coupled-mode theory. Leveraging the advantage of the transmission mode in an optical system, our work paves the way toward cheap, compact, and ultrasensitive infrared spectroscopy. | Source Title: | ACS APPLIED MATERIALS & INTERFACES | URI: | https://scholarbank.nus.edu.sg/handle/10635/169539 | ISSN: | 1944-8244 1944-8252 |
DOI: | 10.1021/acsami.9b18002 |
Appears in Collections: | Elements Staff Publications |
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Loss_engineering_for_Plasmonic_sensors_Paper.pdf | Submitted version | 2.26 MB | Adobe PDF | OPEN | Post-print | View/Download |
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