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This work addresses analysis of hybrid plasmonic/dielectric metamaterials operated in guided wave configurations in the near-infrared domain (» = 1.5 µm). The objective is to achieve an efficient control over the flow of the light in the waveguide using effective index variation induced by metasurface resonances. Specifically we consider a composite guiding structure made of a 2D plasmonic metasurface...
We investigate the effect of loss and gain on transmission characteristics of Kerr-nonlinear directional couplers. We consider a symmetric coupler made of two hybrid dielectric-plasmonic slot waveguides and introduce asymmetric gain profile. We classify the resulting steady states of the nonlinear system and demonstrate that asymmetric steady states, which can only occur for an asymmetric gain profile,...
Silicon-plasmonic photodetection based on internal photoemission exploits the intrinsic absorption in plasmonic waveguides at metal-dielectric interfaces. For this purpose we designed an asymmetric metal-semiconductor-metal waveguide with a width of 75 nm. Our plasmonic internal photoemission detector (PIPED) shows a rec-ord-high photocurrent sensitivity of up to S = 0.12 A / W for light at a wavelength...
Developing a compact, low power and high speed electro-optic modulator is crucial for overcoming the performance bottleneck of electronics. We review progress in chip based silicon compatible plasmonic modulator design, and discuss recent designs which have switching energy close to 1 fJ/bit.
In this study, light trapping of textured silicon solar cell based on light scattering and angle of incident light of plasmonics indium nanoparticles (In NPs) of various dimensions is demonstrated. The light trapping modes of textured surface with and without In NPs for incident angles of 0°, 35.3°, and 54.7° are proposed and characterized. The optical reflectance, external quantum efficiency and...
Thin-film photovoltaic (PV) cell technology has been of keen interest over the last decade or so due to its lower cost of production, wide applicability and lower diffusion length for minority carriers. However, the conversion efficiencies of thin-film PV cells is much lower than that of conventional crystalline Si PV cells. Nanostructures have therefore been designed and implemented with such cells...
Photovoltaic (PV) cells are important devices that can be used to convert photons into electrical energy. However, the cost of current PV devices needs to be significantly reduced and their efficiencies need to be substantially enhanced to enable large scale implementation of PV cells as sources of clean electrical energy. Surface plasmon polaritrons (SPP) in metallic nanostructures in close proximity...
Absorption enhancement in thin film silicon solar cell is the most challenging issue. Plasmonic light trapping technique based on metal nanoparticle is an efficacious solution in this respect. We have designed an enhance absorbed front surface of a thin film Si solar cell placing silver (Ag) nanoparticle on the top of the surface. Light transmittance and photon absorption enhancement are measured...
We propose novel platform for wide range of applications using doped silicon in the Mid infrared. In this range a highly doped silicon acts like a plasmonic waveguide with various interesting application. These application include biomedical sensing, gas sensing, and thermal energy harvesting.
The surface plasmon polaritons (SPPs) have attracted considerable attention because of their ability to localize, confine, and guide electromagnetic energy at the subwavelength scale beyond the diffraction limit. Innovative waveguide structures, including slab, coaxial, dielectric-loaded and other waveguide components, have followed in the wake of the hybrid plasmonic because it features a simultaneous...
We present optical devices that employ free-carrier effects for routing and modulation applications. By electrically controlling the carrier concentration in indium tin oxide, we realize an electro-optic modulator employing the silicon slot waveguide platform. Moreover, using the free-carrier effects in undoped silicon, we demonstrate an optical clock utilizing self-pulsation in a long-range hybrid...
This paper reviews the emerging field of sub-wavelength scale electro optic modulators for integration into a Silicon platform. On a physical level a key aspect is to enhance the interaction between light and matter.
A type of integrated photovoltaic system that can improve the performance of ultrathin silicon solar cells is demonstrated by synergistically exploiting light trapping nanostructures and plasmonically enhanced spectral upconversion. Ultrathin (∼8 µm) nanostructured silicon solar cells are embedded in a thin polymeric medium containing NaYF4:Yb3+,Er3+ upconversion nanocrystals coated on a nanostructured...
We present a beam focusing flat lens for use in the mid-infrared wavelength range. An aperture and second-order grating structure in thin gold and silicon layers is used to excite and then scatter a propagating surface plasmon polariton (SPP) to constructively interfere in the far-field to produce a narrow beam. The silicon layer acts as a mechanism for enhancing the surface plasmon polariton coupling...
We present a beam focusing flat lens for use in the mid-infrared wavelength range. An aperture and second-order grating structure in thin gold and silicon layers is used to excite and then scatter a propagating surface plasmon polariton (SPP) to constructively interfere in the far-field to produce a narrow beam. The silicon layer acts as a mechanism for enhancing the surface plasmon polariton coupling...
The photovoltaic performance enhancement of silicon solar cells depositing indium nanoparticles (In NPs) on TiO2 layer and capping an Al2O3 layer was demonstrated. The impressive performance enhanced was attributed to the In NPs broadband light scattering based on Al2O3/TiO2 antireflection. The optical reflectance, photovoltaic current-voltage, and external quantum efficiency were measured and compared...
Power consumption and bandwidth of electronics appear as the main set of technology barriers in next-generation Data Center and High-Performance Computing (HPC) environments. The limited capacity and pitch lane of electrically wired interconnects require the development of new disruptive technologies to cope with the massive amount of data moving across all hierarchical communication levels, namely...
We analytically determine the contribution of plasmonic nanospheres embedded in absorbing media to total optical absorption. We estimate gains of ∼30% for a 1 µm µc-Si solar cell using 54 nm silica-coated silver nanoparticles.
Three-dimensional patterning of gold nano-particles on SiO2 and Si substrates is performed by ion-beam lithography with 15–20 nm resolution. Realization of an on-demand achiral and chiral modifications of nano-structures are demonstrated. Simulations of optical properties of the obtained nano-architectures reveal the possibility to tailor the field enhancement both in the spatial and spectral domains,...
Due to their out-standing performance (huge bandwidth and high signal quality), optical communications have become the standardized technologies suited for long reach and high bit-rate communication systems. Nevertheless, the traditional incompatibility of CMOS with the optical technology, and the difficulty for all-optical implementation of some key functions such as buffering and header processing,...
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