High Performance Plasmonic Nano-Biosensor Based on Tunable Ultra-Narrowband Perfect Absorber Utilizing Liquid Crystal
- PDF / 1,590,086 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 46 Downloads / 316 Views
High Performance Plasmonic Nano-Biosensor Based on Tunable Ultra-Narrowband Perfect Absorber Utilizing Liquid Crystal Fatemeh Baranzadeh 1 & Najmeh Nozhat 1 Received: 3 April 2020 / Accepted: 6 September 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, a refractive index plasmonic nano-sensor based on a tunable perfect absorber has been proposed in the near-infrared region. The proposed sensor consists of a truncated cone resonator with more than 99% absorption and ultra-narrow bandwidth. Liquid crystal has been used in the designed nano-structure to tune the structure by variation of the incident angle and applying the external bias field to obtain the near perfect and ultra-narrow absorption peak. The proposed nano-sensor has a high sensitivity of 1363.63 nm/RIU and a high figure of merit of 1136.36 RIU−1 at the telecommunication wavelength of 1550 nm. Furthermore, after obtaining appropriate conditions for the liquid crystal layer, we have suggested a new resonator to boost the interaction of surface plasmons and the test medium. Therefore, the sensitivity and figure of merit are increased to the values of 1509 nm/RIU and 1257.5 RIU−1, respectively. This excellent performance of the sensor has huge potential for precision applications such as biomedical science and biosensor. Hence, the capability of the proposed nano-sensor in the field of histopathology for cancerous tissue diagnosis and detection of toxic and flammable gases to prevent endangering human health has been studied. In this case, the high sensitivity of 1368.06 nm/RIU and high figure of merit of 1179.36 RIU−1 have been obtained. Keywords Cancer . Hazardous gases . Liquid crystal . Nano-sensor . Perfect absorber . Ultra-narrowband
Introduction Plasmonics is one of the fascinating fields of nano-photonics, and it is based on the interaction of electromagnetic waves and conduction electrons in metal nano-structures [1]. Recently, excitation of surface plasmons in metallic nano-structures has attracted particular attention for sensing applications [2]. Plasmonic nano-sensors based on surface plasmon resonances detect changes in the surrounding environment. The performance of plasmonic sensors is based on localized surface plasmons (LSPs) and propagating surface plasmons (PSPs), which electromagnetic waves are concentrated and enhanced on single or metallic nanoparticles array and planar metallic films, respectively [3]. Plasmonic nano-sensors are capable of real-time detection without labeling process and also they are highly sensitive [1, 4]. Hence, they are promising candidates for important applications such as food industry [5], cancer diagnosis [6], hematology [7], and gas detection [8]. * Najmeh Nozhat [email protected] 1
Department of Electrical Engineering, Shiraz University of Technology, Shiraz, Iran
The performance of LSP-based sensors depends on the shape and size of nano-structure [9]. Therefore, several nano-sensors with different geometries such as nanospheres [10], nanodiscs [11],
Data Loading...
