A metallic nanostructured array that scatters radiation toward a thin layer generates surface plasmon resonances for normally incident light. The location of the minimum spectral reflectivity serves to detect changes in index refraction medium under analysis. normal incidence operation eases its integration with optical fibers. geometry arrangement and material selection are changed optimize some performance parameters as sensitivity, figure merit, field enhancement, width. This optimization...

In this paper, we present a plasmonic refractometric sensor that works under normal incidence; allowing its integration on fiber tip. The sensor's material and geometry exploit the large scattering cross section given by high contrast of index refraction subwavelength dielectric gratings. Our design generates hybrid plasmonic-Fano resonance due to interference between surface plasmon grating response. We optimize with merit function combines quality parameter field enhancement at interaction...

Hydrogenated amorphous silicon (a-Si:H) solar cells have some performance limitations related to the mobility and lifetime of their carriers. For this reason, it is interesting explore thin-film solutions, achieving a tradeoff between photons optical absorption electrical path carriers get optimum thickness. In work, we propose insertion metasurface based on cross-patterned ITO contact film, where crosses are filled with nanospheres. We numerically demonstrate that configuration improves...

Abstract The use of several layers different materials, taking advantage their complementary bandgap energies, improves the absorption in multi-junction solar cells. Unfortunately, inherent efficiency increment this strategy has a limitation: each interface introduces optical losses. In paper, we study effects materials and geometry performance nanostructured hybrid perovskite – silicon tandem cell. Our proposed design increases both subcells by managing light towards active layer, as well...

The real-time characterization of the polarization state a light beam is importance for variety applications in Optics and Photonics. We have designed device that includes Vector Diffractive Optical Element (VDOE) to determine an incident beam. able simultaneously evaluate four Stokes parameters under analysis. VDOE sectorized into several Fresnel zone plates, enabling compact arrangement facilitating optoelectronical integration. also developed procedure remove diffractive effects...

Nanostructured anti-reflection coatings (ARC) are used to reduce the reflectivity of front surface solar cells. Computational electromagnetism helps evaluate spectral this type ARC using several approaches. They typically require large computational resources both in time and hardware elements (memory allocation, speed processors, etc.). Long times may jeopardize optimization processes based on iterative evaluation a given merit function that depends parameters. Then, simplified analytic...

Solar energy is now dealing with the challenge of overcoming Shockley-Queisser limit single bandgap solar cells. Multilayer cells are a promising solution as so-called third generation The combination materials different energies in multijunction enables power conversion efficiencies up to 30% at reasonable costs. However, interfaces between layers critical due optical losses. In this work, we propose hybrid metasurface monolithic perovskite-silicon cell. design takes advantage light...

Stainless steel is a basic raw material used in many industries. It can be customized by generating laser-induced periodic surface structure (LIPSS) as subwavelength gratings. Here, we present the capabilities of an LIPSS on stainless to modify polarization state reflected radiation at IR band. These structures have been modeled using finite element method and fabricated femtosecond laser processing. The Stokes parameters obtained experimentally model for shape has fit simulated values...

Abstract Low-cost hydrogenated amorphous silicon solar cells (a-Si:H) can perform better and be more competitive by including nanostructures. An optimized nano-dimer structure embedded in close contact with the back electrode of an aSi:H ultra-thin enhance deliverable short-circuit current up to 27.5 %. This enhancement is result increase absorption at active layer, that product efficient scattering from nanostructure. From our calculations, must made out a high-index refraction material,...

Customized metasurfaces allow for controlling optical responses in photonic and optoelectronic devices over a broad band. For sensing applications, the spectral response of an device can be narrowed to few nanometers, which enhances its capabilities detect environmental changes that shift transmission or reflection. These nanophotonic elements are key new generation plasmonic sensors with custom modes operation. In our design, metallic top electrode hydrogenated amorphous silicon thin-film...

A periodic array of extruded nanoprisms is proposed to generate surface plasmon resonances for sensing applications. Nanoprisms guide and funnel light towards the metal-dielectric interface where dielectric acts as medium under test. The system works normal incidence conditions spectrally interrogated. performance better than classical Kretschmann configurations, values sensitivity figure merit are competitive with other plasmonic sensor technologies. geometry choice materials have been made...

In this work, we propose a technique to simultaneously measure the absolute retardance and fast axis azimuth of retarder using Michelson interferometer with polarization control. One mirrors is slightly tilted obtain interference fringes collimated beams. The sample rotated parameters are obtained from displacement. does not require use additional previously characterized retarders in measurement process, but only linear polarizers. experimental results present errors order 2∘ for 1∘ axis.

Abstract The practical development of compact modern nanophotonic devices relies on the availability fast and low-cost fabrication techniques applicable to a wide variety materials designs. We have engraved split grating geometry stainless steel using femtosecond laser processing. This structure serves as template fabricate efficient plasmonic sensors, where thick gold layer is grown conformally it. scanning electron microscope (SEM) images confirm generation laser-induced periodic spatial...

This work reports on a computational analysis of how modified perovskite cell can as refractometric sensor by generating surface plasmon resonances at its front surface. Metal-dielectric interfaces are necessary to excite plasmonic resonances. However, if the transparent conductor (ITO) is replaced uniform metal layer, optical absorption active layer decreases significantly. enhances again when metallic nanostructured, adding periodic extruded array high aspect-ratio dielectric pyramids....

Ultrathin amorphous silicon hydrogenated (aSi-H) solar cells grown on a one-dimensional (1-D) dielectric subwavelength gratings improve the short circuit current by factor of more than 51% when compared with conventional, flat ultrathin aSi-H devices. This improvement is possible due to several mechanisms. In addition increase in exposed area caused nanostructured surface, reliable computational electromagnetic evaluation interaction spectrum cell structure demonstrates that absorption at...

The dark conductivity (dc and ac) dielectric properties of chromotrope 2R (CHR) in pellet as well thin film forms have been investigated function frequency (100 Hz to 5 MHz) within the temperature range (293–423 K). ac CHR sandwich structure employing two symmetrical gold ohmic contacts shows both dependence with relatively stronger higher lower ranges respectively. It is found that σac(ω) obey Jonscher’s universal power law, = Aωs s < 1 results has analyzed reference various theoretical...

We configure and analyze a nanostructured device that hybridizes grating modes surface plasmon resonances. The model uses an effective index of refraction considers the volume fraction involved materials, propagation depth through structure. Our geometry is extruded low-order diffraction made dielectric nano-triangles. Surface resonances are excited at metal/dielectric interface, which separated from analyte by high-index layer. optical performance refractometric sensor highly competitive in...

The bolometric effect allows us to electrically monitor spectral characteristics of plasmonic sensors; it provides a lower cost and simpler sample characterization compared with angular signal retrieval techniques. In our device, monochromatic light source illuminates spectrally selective nanostructure. This arrangement is formed by dielectric low-order diffraction grating that combines two materials high-contrast in the index refraction. Light interacts this structure reaches thin metallic...

The generation of surface plasmon resonances (SPR) in laser-induced periodic structures (LIPSS) allows their application the field optical sensing, such as detection refractive index variations gases and liquids. We have fabricated gold-coated LIPSS nanostructures on stainless steel substrates by using femtosecond laser nano-ablation. This technique is a low-cost high-throughput fabrication method applicable to fast large-scale manufacturing. depth profile shows central dip at top each...