Performance analysis of Bloch surface wave-based sensor using transition metal dichalcogenides
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ORIGINAL ARTICLE
Performance analysis of Bloch surface wave‑based sensor using transition metal dichalcogenides Amit Kumar Goyal1 · Jasmine Saini1 Received: 4 July 2020 / Accepted: 12 August 2020 © King Abdulaziz City for Science and Technology 2020
Abstract In this manuscript, a highly sensitive Bloch surface wave (BSW)-based sensor is proposed for refractive index sensing analysis. The structure is designed using an one-dimensional photonic crystal (1D-PhC) structure. A top defective layer of transition metal dichalcogenides (TMDC) material with atomic layer thickness is introduced to confine a Bloch mode analogues to surface plasmon-like mode at the top interface. The detailed analysis is carried out to investigate the impact of number of TMDC monolayers on sensing performance. The wavelength (angular) interrogation provides the significant higher sensitivity of around 9650 nm/RIU (or 231°/RIU). Besides the sensitivity, the rigorous analysis of full-width-halfmaximum (FWHM) and figure-of-merit (FOM) is also carried out and a FOM of around 48,250/RIU (38,500/RIU) has been reported. The proposed design possesses the advantage in terms of easy fabrication and integration capability to develop handheld senor systems, especially for biological and chemical sensing. Keywords One-dimensional photonic crystal · Bloch surface wave · Biochemical sensor · Transition metal dichalcogenides
Introduction Since the last few decades, surface wave-based sensing techniques like surface plasmon (SPR) and Bloch surface wave (BSW) have been deployed in a variety of sensing applications ranging from chemical, gaseous and biological sensors (Khan and Corbett 2016; Meade et al. 1991; Robertson et al. 1993). The most intriguing features of these sensors are the label free detection, fast real-time response and better sensitivity (Singh 2016; Nguyen et al. 2015; Scognamiglio et al. 2014). Surface plasmon resonance (SPRs) modes are usually excited at metal-dielectric or metal-analyte interface. These mods are known to be highly sensitive to the small perturbation to the surrounding environment. However, their performance improvement is limited because of larger absorption losses hence low FOM, short term stability, complex and costly fabrication processes (Gan et al. 2019; Sinibaldi et al. 2012; Khurgin and Boltasseva 2012). The same can be resolved by replacing the metal with dielectric and exciting plasmonic-like mode called Bloch surface waves (BSW) at * Amit Kumar Goyal [email protected] 1
ECE Department, Jaypee Institute of Information Technology, Noida‑62, Uttar Pradesh 201309, India
the surface of one-dimensional photonic crystals (1D-PhC) (Sinibaldi et al. 2012). BSWs are extremely sensitive to surface perturbations and exhibit comparably better sensing capability along with low absorption, long propagation length and spectral tunability (Yeh et al. 1977; Fenzl et al. 2014). This makes BSW devices desirable to be used for chemical sensing, bio sensing and gas sensing applications compared to other surface wave and
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