Toroidal dipole resonances enhanced second harmonic generation with shallow etching of lithium niobate metasurface DOI
Wenyao Chang, Jianmei Li, Cai Luo

и другие.

Optics Letters, Год журнала: 2024, Номер 50(2), С. 630 - 630

Опубликована: Дек. 17, 2024

Lithium niobate (LiNbO 3 ) has shown great potential for applications in nonlinear metasurfaces, thanks to its large second-order coefficients and high integration capabilities. Optical resonances play a crucial role further enhancing the optical responses of LiNbO metasurfaces (LNMS). In this study, both numerically experimentally, we designed fabricated metasurface structure that supports toroidal dipole (TD) resonance enhance second-harmonic generation (SHG). This structure, which consists an array shallow-etched square columns on continuous thin film, intensifies SHG signal at 400 nm within film by means strong local field confinement. Experimental results indicate is ten times stronger compared lithium insulator (LNOI). These findings emphasize TD performance integrated nanophotonic applications.

Язык: Английский

Novel Octa‐Structure Metamaterial Architecture for High Q‐Factor and High Sensitivity in THz Impedance Spectroscopy DOI Creative Commons
Heena Khand, Rudrarup Sengupta, Gabby Sarusi

и другие.

Advanced Science, Год журнала: 2024, Номер unknown

Опубликована: Окт. 30, 2024

Abstract Terahertz (THz) electric inductive‐capacitive (ELC) resonant metamaterials (MMs) are well established tools that can be used to detect the presence of dielectric material (e.g., nanoparticles, bioparticles, etc.) spread on their surfaces within gap capacitive plates a nanoantenna array. In THz spectroscopy, amount red shift in resonance frequency (Δ F ) plays an important role detection nanoparticles and concentration. We introduce new LC MM architecture ELC category maximizes sensitivity. The newly proposed has octahedral structure with uniform gaps at each forty‐five‐degree interval, making super‐symmetric polarization independent. inductor core is condensed into central solid circle connecting all eight lobes octahedron, thereby completing circuit. This resonator very large active areas (capacitor‐gaps), hotspots periphery unit cell. repeated clustered fashion, so peripheral also utilized sensing. results enhancing quality factor resonance, as increasing Δ . research comprises combination rigorous system‐level simulations along impedance spectroscopy laboratory experiments. achieved highly sensitive sensor sensitivity reaching 1600 GHz/RIU. fully CMOS compatible promising potential applications high‐sensitivity bio‐sensing, characterization ultra‐low‐concentration dielectrics detection, sensing differential changes composition substances deposited metasurface.

Язык: Английский

Процитировано

1
Toroidal dipole resonances enhanced second harmonic generation with shallow etching of lithium niobate metasurface DOI
Wenyao Chang, Jianmei Li, Cai Luo

и другие.

Optics Letters, Год журнала: 2024, Номер 50(2), С. 630 - 630

Опубликована: Дек. 17, 2024

Lithium niobate (LiNbO 3 ) has shown great potential for applications in nonlinear metasurfaces, thanks to its large second-order coefficients and high integration capabilities. Optical resonances play a crucial role further enhancing the optical responses of LiNbO metasurfaces (LNMS). In this study, both numerically experimentally, we designed fabricated metasurface structure that supports toroidal dipole (TD) resonance enhance second-harmonic generation (SHG). This structure, which consists an array shallow-etched square columns on continuous thin film, intensifies SHG signal at 400 nm within film by means strong local field confinement. Experimental results indicate is ten times stronger compared lithium insulator (LNOI). These findings emphasize TD performance integrated nanophotonic applications.

Язык: Английский

Процитировано

0