Electric field enhancement between two Si microdisks

Abstract

The field enhancement in the gap between two Si microdisks is theoretically investigated using the finite difference time domain method. We show that the electric field within this gap increases as the distance between the two disks decreases, and it can be enhanced by as much as two orders of magnitude. By perturbing the Si microdisks to force the field leakage into an ever smaller volume, the field enhancement can reach a value as high as 238 with a deep sub-wavelength mode volume. This behavior is comparable to what can be observed in gap plasmons between metal nanoparticles, but is produced here in purely dielectric structures.

Unidirectional light scattering with high efficiency at optical frequencies based on low-loss dielectric nanoantennas

“…This drawback has hampered the realization of the aforementioned applications using metallic plasmonic nanoparticles 7 and stimulated the study of high-refractive-index dielectric nanoparticles as an alternative. For instance, dimers or oligomers of silicon nanostructures have been revealed to enhance and confine the electromagnetic field into the gap region, and increase the scattering efficiency, without appreciable heat generation [8][9][10][11][12][13][14][15][16] . These dielectric nanoantennas can be exploited, for example, by spectroscopic techniques such as fluorescence microscopy or surface enhance Raman scattering, where undesired heat could disturb the response of the sample 17 .…”

Purcell factor of spherical Mie resonators

“…These modes can be easily and efficiently excited either from near or far field illumination [1][2][3]. This novel class of photonic resonators is very promising to design directive antennas [4][5][6], to enhance the electric or magnetic near field intensities [7][8][9][10], to design subwavelength sized light cavities [8,11,12], to host frequency mixing processes such as third harmonic generation [13], and even to create isotropically polarized speckle patterns [14].…”

Chemical Alkaline Etching of Silicon Mie Particles

“…[1][2][3][4][5] These particles are very promising to design subwavelength sized photo nic resonators because they exhibit weak losses and can be used to enhance either the electric or magnetic fi eld intensities. [6][7][8][9] The interplay between the electric and magnetic resonances provides to Mie resonators unique light scattering properties. [10][11][12][13][14][15][16][17][18][19] Different techniques have been developed to fabricate single or coupled Si-based Mie resonators.…”