Recent research in all-dielectric asymmetric metasurfaces has demonstrated the capability to generate highly sharp Fano resonances, offering bright prospects for applications in optical biosensing. This work proposed a Fano Resonance in Near-Infrared Metasurface based on Asymmetric All-Dielectric Cylindroids. Each unit of the metasurface consists of two all-dielectric Si elliptical cylinders with different short-axis lengths arranged on top of an MgF2 dielectric layer. By employing the Finite-Difference Time-Domain (FDTD) numerical analysis method, we investigate the optical characteristics of the metasurface. We found that when the semi-minor axis of the asymmetric cylindroids are 0.1μm(w1) and 0.094μm(w2), the metasurface exhibits a sharply narrow Fano resonance peak at λ=1.013μm, with a reflection intensity exceeding 92% and a Q-factor as high as 580. Which works at near-infrared region. The physical mechanism of the metasurface is the principle of electromagnetic coupling. The simulation results indicate that the Fano resonance arises from the interference of two distinct electric quadrupole modes. Moreover, the results demonstrate that the sensor exhibits a sensitivity of up to 85 nm/RIU, thereby validating its potential applications in areas such as biosensing and refractive index sensing.
We propose a metal-insulator-metal (MIM) waveguide structure in which the plasma-induced transparency (PIT) effect is based. Using the finite-difference in time domain (FDTD) method, the designed structure was simulated in two dimensions. It obtains both narrowband PIT peaks, both with more than 90% absorption. In addition, we use the Kerr material filled in the cavity for tuning, and we can find that the transmission spectrum shifts with increasing pump light intensity. The proposed structure can be applied to filter. The proposed structure has important prospects for application in integrated optical devices.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.