In this presentation, we propose a method to engineer the resonant wavelengths of electric (ED) and magnetic dipoles (MD) with new structure parameters, gap size and position. A low index gap is introduced inside a high index dielectric rectangular block. As the gap size increases and the geometric volume is maintained, the resonant wavelength of MD blue-shifts significantly with keeping the scattering intensity. On the other hand, the resonant wavelength of ED is relatively insensitive to the gap size and position. Our method to introduce low index gap in high index meta-atom can provide new degrees of freedom to engineer the wavelengths of the multipole modes independently and can be utilized to design a metasurface as desired.
We propose a method to manipulate multipole interference by combining different dielectric nanoparticles to build a meta-molecule in which each dielectric nanoparticle exhibits the required resonant wavelength and scattering intensity of Mie resonances. In this method, each atom can be designed a geometrical shape to satisfy the required multipole's optical properties independently. So, we design dielectric cylinders to have strong electric, magnetic dipole intensity in each cylinder at the same wavelength, which satisfies the Kerker effect and shows unidirectional scattering. We expect it can be used as a sensor by analyzing the Far-field pattern transformed through various defects and deployments.
We propose a Fabry-Pérot type optical cavity based on an array of double dielectric nano-cylinder arrays. Fabry-Pérot cavity at double cylinder array are formed by two dielectric cylinder arrays. Double dielectric nano-cylinder arrays with a period of 660 nm shows high quality factor than 10^6. Also, the Fabry-Pérot resonant wavelengths and quality factors can be tuned by controlling the gap between double dielectric cylinders. Specifically, the quality factor and Fabry-Pérot resonant wavelengths, which are not much affected by the horizontal alignment of double cylinders. Our structure has simplicity and high efficiency. Which can be used in combination with laser and filter.
We proposed a spectrally tunable photonic crystal (PC) cavity that is also relocatable spatially. The PC cavity is formed by setting a microsized dielectric sphere on a defect-free PC slab at a desired point. The resonant wavelength of the PC cavity can be tuned from 1343 to 1725 nm by changing the parameters of the sphere, e.g., the radius or the refractive index. In addition, the wavelength is also adjusted finely (∼5 nm) by moving the sphere upward.
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