The effects of the variation of thickness and the material of the dielectric layer on the DA of the SPR sensor were investigated.
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The result indicated that adding a top dielectric layer with a small refractive index less than the refractive index of the analyte can improve the DA of a traditional SPR sensor. In addition, by comparing the variation law of the DA and the electric field intensity at the analyte—dielectric interface of the SPR sensor, we studied the physical mechanism of DA variation.
This study can be helpful for high-performance SPR sensor development. Modified field confinement and enhanced optical forces in hybrid dielectric wedge tip-loaded plasmonic waveguide. We proposed and theoretically investigated a hybrid plasmonics waveguide consisting of a tiptilted quadrate nanowire, which was embedded in a low-permittivity dielectric and placed on a metal substrate with a small gap distance. Due to the corner effect, the hybrid mode with extremely local field enhancement has the long propagation length and strong coupling strength between the dielectric nanowire and metal.
The use of a naturally dielectric wedge tip of quadrate nanowire that can be chemically synthesized provides an efficient approach to circumvent the fabrication difficulty of shape wedge tips. The present structure provides an excellent platform for nanophotonic waveguides, nanolasers, nanoscale optical tweezers, and biosensing. Determination of optical band gap of powder-form nanomaterials with improved accuracy.
Ragib Ahsan , Md. Absorption coefficients of powder-form nanomaterials calculated from absorbance spectrum do not match those calculated from diffuse reflectance spectrum, implying the inaccuracy of the traditional optical band gap measurement method for such samples. We have modified the Beer—Lambert law and the Kubelka—Munk function with proper approximations for powder-form nanomaterials.
Applying the modified method for powder-form nanomaterial samples, both absorbance and diffuse reflectance spectra yield exactly the same absorption coefficients and therefore accurately determine the optical band gap. Design and analysis of light trapping in thin-film gallium arsenide solar cells using an efficient hybrid nanostructure. Light trapping in thin-film solar cells is important for improving efficiency and reducing cost. We propose a hybrid nanostructure based on the anodic aluminum oxide grating and Si3N4 double-layer antireflection coatings combined with Ag nanoparticles to achieve advanced light trapping property in gallium arsenide GaAs solar cells with nm thickness.
The finite-element method is used to study the relationship between geometrical parameters of hybrid nanostructure and optical characteristics of thin-film GaAs solar cells. The average absorption in nm-thick GaAs layer is The short circuit current density in nm-thick GaAs layer is Research paves the way for designing highly efficient light trapping structures in thin-film GaAs solar cells. Criterion for determining resolving power in the optical near field. Martin Moskovits. The resolution limit, i. Such criteria assume one is making observations at distances greater than the wavelength of the light emitted or scattered by the luminous object, i.
Although near-field microscopy is an established imaging technique, the analogous resolution criterion pertinent to the near field, in which the distance between the observer or the observing instrument and the light emitter is smaller than the wavelength, has not yet been quantitatively enunciated. The first, based on classical physics, concludes that the minimal lateral near-field resolution limit is equal to the perpendicular distance between the near-field probe and the object. Quantification of whispering gallery mode spectrum variability in application to sensing nanobiophotonics.
An approach for the automated whispering gallery mode WGM signal decomposition and its parameter estimation is discussed. The algorithm is based on the peak picking and can be applied for the preprocessing of the raw signal acquired from the multiplied WGM-based biosensing chips.
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Quantitative estimations representing physically meaningful parameters of the external disturbing factors on the WGM spectral shape are the output values. Derived parameters can be directly applied to the further deep qualitative and quantitative interpretations of the sensed disturbing factors. The algorithm is tested on both simulated and experimental data taken from the bovine serum albumin biosensing task. The proposed solution is expected to be a useful contribution to the preprocessing phase of the complete data analysis engine and is expected to push the WGM technology toward the real-live sensing nanobiophotonics.
Enhancement of the solar cell based on nanophotonic crystals. Arafa Aly , Hassan Sayed. Here, we have successfully designed a photonic crystal structure to improve the light absorption by increasing the optical path length of the incident light inside the absorbing material to enhance the efficiency of a thin film silicon solar cell. We have substituted the indium tin oxide as a front contact and antireflection coating in the conventional cell by HTcScD PCs. Also, we have substituted the back contact and the back reflector of the conventional cell construction by HTcScD PCs. The aim of these substitutions is to reduce the power dissipation in a thin film silicon solar cell.
Numerical results of the proposed structure are obtained based on the transfer matrix method, the finite element method, and COMSOL Multiphysics software.
The HTcScD PCs reduced the power dissipation in the thin film silicon solar cell due to the increase of the optical generation term of electron—hole pairs. Finally, using high temperature superconducting photonic crystals in photovoltaic applications is promising and may be of potential use in the future. Electro-optical study of nanoscale Al-Si-truncated conical photodetector with subwavelength aperture. A type of silicon photodiode has been designed and simulated to probe the optical near field and detect evanescent waves.
These waves convey subwavelength resolution. Electrical and electro-optical simulations have been conducted. These results are promising toward the fabrication of a new generation of photodetector devices. Terahertz generation by gigahertz multiplication in superlattices. A discussion of the current limitation of housing designs for the superlattices is given, based on a simple model for the local electric field and in comparison with measured input powers delivered by a backward wave oscillator. Optics of multiple grooves in metal: transition from high scattering to strong absorption.
Enok J. This paper theoretically studies how the optics of multiple grooves in a metal change as the number of grooves gradually increased from a single groove to infinitely many arranged in a periodic array. In the case of a single groove, the out-of-plane scattering OUP cross section at resonance can significantly exceed the groove width. On the other hand, a periodic array of identical grooves behaves radically different and is a near-perfect absorber at the same wavelength. When illuminating multiple grooves with a plane wave, the OUP cross section is found to scale roughly linearly with the number of grooves and is comparable with the physical array width even for widths of many wavelengths.
The normalized OUP cross section per groove even exceeds that of a single groove, which is explained as a consequence of surface plasmon polaritons generated at one groove being scattered out of the plane by other grooves. In the case of illuminating instead with a Gaussian beam and observing the limit as the incident beam narrows and is confined within the multiple-groove array, it is found that the total reflectance becomes very low and that there is practically no OUP.
The well-known result for periodic arrays is thus recovered. Both rectangular and tapered grooves are considered. Design of custom photonic crystal cavities using interference lithography in combination with sidelobe-suppressed Bessel beam and optical phase engineering. Amit Kapoor , Joby Joseph. We present an experimental technique based on modified multiple beam interference approach to generate various types of photonic crystal PhC cavities used in study of nanolasers and cavity quantum electro dynamics.
Here, we propose an improvement to the existing method for better realization of PhC cavities and a method to control the hole radius to realize high Q-factors. We used phase-modified Bessel beam of zero and second order and superposed them to get a sidelobe-suppressed Bessel beam. This beam was further interfered with lattice wave field to get defined PhC cavity. We used spatial light modulator-assisted phase-engineered masks with 4F filtering setup to confirm the simulated patterns experimentally. My Library.
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