Giant localized electromagnetic field of highly doped silicon plasmonic nanoantennas

Abstract

In this work, we present the analysis and design of an efficient nanoantenna sensor based on localized surface plasmon resonance (LSPR). A high refractive index dielectric nanostructure can exhibit strong radiation resonances with high electric field enhancement inside the gap. The use of silicon instead of metals as the material of choice in the design of such nanoantennas is advantageous since it allows the integration of nanoantenna-based structures into integrated-optoelectronics circuits manufactured using common fabrication methods in the electronic industry. It also allows the suggested devices to be mass-produced at a low cost. The proposed nanoantenna consists of a highly doped silicon nanorod and is placed on a dielectric substrate. Different shapes and different concentrations of doping for the nanoantenna structures that are resonant in the mid-infrared region are investigated and numerically analyzed. The wavelength of the enhancement peak as well as the enhancement level itself vary as the surrounding material changes. As a result, sensors may be designed to detect molecules via their characteristic vibrational transitions. The 3D FDTD approach via Lumerical software is used to obtain the numerical results. The suggested nanoantennas exhibit ultra-high local field enhancement inside the gap of the dipole structure.

Far-Field Petahertz Sampling of Plasmonic Fields

“…The experimental observations were compared to FDTD calculations implemented using Lumerical 2022 R1 software (ANSYS, Inc.). 25 As input parameters we used the particle dimensions, the dielectric constants of the materials, and the sampled incident E-field. To account for the inhomogeneous broadening of the plasmon resonance, we calculated the interaction between the experimental few-cycle field with five particles of different sizes, considering the determined size distribution from TEM analysis as a weighting factor.…”

“…The experimental observations were compared to FDTD calculations implemented using Lumerical 2022 R1 software (ANSYS, Inc.) . As input parameters we used the particle dimensions, the dielectric constants of the materials, and the sampled incident E-field.…”

Surface-enhanced photoluminescence and Raman spectroscopy of single molecule confined in coupled Au bowtie nanoantenna

“…Localized surface plasmon resonance (LSPR) phenomenon will occur when the frequency of the incident light is consistent with the natural frequency oscillation of the electrons on the metallic nanoantenna surface, resulting in the enormous electric field [3][4][5]. Nanoantenna structures supporting LSPR offer a way to break the optical diffraction limit by concentrating light into subwavelengths [6][7][8][9]. The distribution of the electric field depends on the configuration of plasmonic nanoantenna, which typically exhibits strong enhancement and localization on the surface of the antenna, especially at the smaller tips and gaps of dimers or polymers [10][11][12][13][14][15].…”

Mid-infrared localized surface plasmon resonances in silicon-dioxide nanoantennas for ozone detection

“…Researchers have focused on how metallic nanoparticles affect light and can now create tiny objects and structures smaller than the wavelength of light. Plasmonic devices control light through metal/dielectric interfaces and can be used for many things including solar cells, power splitters, and 3D chips [6]. Nanoantennas are an excellent choice to control LSPR intensity due to their light-directing and harvesting properties.…”