Please use this identifier to cite or link to this item: 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
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