Optical refractive nanosensor with planar resonators metamaterial

Anapole Manipulation in Tailored Si Nanocubes for Near-Field Enhancement and High Q-Factor Resonance

“…Equation 7 shows that far-field radiation becomes zero when the contributions of the electric dipole and the toroidal dipole moments are out of phase during scattering = P ikT (8) This condition is necessary for the excitation of the nonradiative anapole. Figure 1c shows that P (blue) and T (red) intersect at 952 nm.…”

“…Metamaterials are materials that are typically engineered with artificial structures to produce electromagnetic properties that are unusual or difficult to obtain in nature . Metallic metamaterials that feature a multitude of localized and propagating surface plasmon modes have received considerable attention over the past few decades due to their unprecedented ability to concentrate light into subwavelength volumes. , The hot spots of the electromagnetic field generated by metal metamaterials are localized at structure tips, troughs, gaps, and other positions, which have strong electromagnetic field enhancement and nonlinear enhancement ability. , The design of various plasmonic metamaterials has led to a series of revolutionary breakthroughs in different fields, such as label-free biosensing, refractive index sensing, − surface-enhanced Raman scattering (SERS), , perfect light absorption, , cloaks, radiative cooling, pinning effects, photocatalysis, , and nanolasers. , However, the high intrinsic absorption, radiation losses, and associated local heating of plasmonic nanostructures severely limit their practical applications in many scenarios. Compared to plasmonic metamaterials, the optical response of high-index dielectric materials exhibits negligible dissipative losses, high heat resistance, and strong electromagnetic multipolar resonances in the operating wavelength. − Electromagnetic fields can be localized inside the dielectric, which strongly enhances the interaction between light and matter .…”

Electromagnetic field manipulation in planar nanorod antennas metamaterial for slow light application

“…Plasmonic nanostructures, supported collective electron excitions known as surface plasmon, have an ability to manipulate and concentrate light into deep-subwavelength scales. Although resistive heating losses in plasmonic metals severely limit the performance of optical devices, many successful applications have been achieved such as plasmonic lenses [1], sensors [2], perfect-absorbers [3], nanoantennas [4], switches [5], slow-light devices [6], surface-enhanced chips [7], and polarization controllers [8].…”

Self-reference plasmonic sensor with ultranarrow linewidths based on SPP and cavity resonances

“…2) Many efforts in recent years also have been devoted for reducing the losses and narrowing the FWHM of SPP modes. [20][21][22][23][24][25][26][27][28] For example, Liu et al proposed a periodic silver hexagonal array with an ultra-narrow reflection dip originated from SPP modes. 1) In the work, the decreasing depths of nanohole and nanoslit are designed for minimizing the feature sizes of metal nanostructures to reduce the radiative losses.…”