Electrochemically Prepared Pore Arrays for Photonic-Crystal Applications

MRS Bulletin ◽  
2001 ◽  
Vol 26 (8) ◽  
pp. 623-626 ◽  
Author(s):  
R.B. Wehrspohn ◽  
J. Schilling
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Electromagnetic Waves ◽  
Porous Alumina ◽  
Dielectric Materials ◽  
Dielectric Medium ◽  
Geometrical Parameters ◽  
Quarter Wavelength ◽  
Physically Based ◽  
1D Photonic Crystal

In the last few years, photonic crystals have gained considerable interest due to their ability to “mold the flow of light.” Photonic crystals are physically based on Bragg reflections of electromagnetic waves. In simple terms, a one-dimensional (1D) photonic crystal is a periodic stack of thin dielectric films with two different refractive indices, n1 and n2. The two important geometrical parameters determining the wavelength of the photonic bandgap are the lattice constant, a = d1(n1) + d2(n2), and the ratio of d1 to a (where d1 is the thickness of the layer with refractive index n1, and d2 is the thickness of layer n2). For a simple quarter-wavelength stack, the center wavelength λ of the 1D photonic crystal would be simply λ = 2n1d1 + 2n2d2. In the case of 2D photonic crystals, the concept is extended to either airholes in a dielectric medium or dielectric rods in air. Therefore, ordered porous dielectric materials like porous silicon or porous alumina are intrinsically 2D photonic crystals.

scholarly journals Optical Properties of Nanostructured Silver Embedded by Electro-Thermo-Diffusion in Opal Photonic Crystal

2015 ◽  
Vol 1 ◽  
pp. 230 ◽  
Author(s):  
V.L. Veisman ◽  
S.G. Romanov ◽  
V.G. Solovyev ◽  
M.V. Yanikov
Keyword(s):  
Optical Properties ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Fano Resonance ◽  
Electromagnetic Waves ◽  
Reflectance Spectroscopy ◽  
Nanocomposite Materials ◽  
Bragg Diffraction ◽  
Silver Dendrites ◽  
Opal Template

<p class="R-AbstractKeywords"><span lang="EN-US">Novel nanocomposite materials <em>Ag / opal</em> have been prepared by electro-thermo-diffusion of silver in opal template. Optical properties of these photonic crystals have been studied by angle-resolved reflectance spectroscopy. Interpretation of the observed optical spectra has been made on the basis of the Bragg diffraction and the Fano resonance</span><span lang="EN-US">between diffracted in <em>Ag / opal</em> composite photonic crystal electromagnetic waves and those resonantly scattered by silver dendrites.</span></p>

Optical properties of one-dimensional defective photonic crystal containing nanocomposite material

2017 ◽  
Vol 26 (01) ◽  
pp. 1750007 ◽  
Author(s):  
Arafa H. Aly ◽  
Hussein A. Elsayed ◽  
Christina Malek
Keyword(s):  
Optical Properties ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Volume Fraction ◽  
Dielectric Materials ◽  
Defect Layer ◽  
Nanocomposite Materials ◽  
One Dimensional ◽  
Plasmon Frequency ◽  
Metal Thickness

We have obtained the optical properties of one-dimensional defective photonic crystals containing nanocomposite materials of Ag as a defect layer in UV region; the permittivity of nanocomposite materials depends on plasmon frequency of metal nanoparticles. Our analysis is based on the fundamentals of the transfer matrix method. We have investigated the effect of many parameters such as metal thickness, volume fraction, and defected dielectric materials on the intensity of a defect layer.

Fabrication of Photonic Crystal Based on Polystyrene Particles

2015 ◽  
Vol 827 ◽  
pp. 271-275 ◽  
Author(s):  
Lusi Safriani ◽  
Ian Sopian ◽  
Tuti Susilawati ◽  
Sahrul Hidayat
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Self Assembly ◽  
Flexible Substrate ◽  
Stop Band ◽  
3D Structure ◽  
Dielectric Materials ◽  
Filling Fraction ◽  
Future Technology ◽  
Assembly Method

Photonic crystals are dielectric materials with different refractive index or permittivity periodically. Photonic crystals have widely application for future technology such as waveguide, optical transistor, cavity of laser and biosensor. Photonic crystals can be fabricated in three types i.e 1D, 2D and 3D structure. In this paper, we report the successful fabrication of 3D photonic crystal from polystyrene particles. The fabrication process began with the synthesis of polystyrene particles followed by deposition on glass and flexible substrate using self-assembly method. We obtained polystyrene monodispered particles which have a uniform shaped with diameter 320 nm. Self-assembly method resulted to the arrangement of polystyrene particles on glass and flexible substrate. Stop band which is related to its optical property are at wavelength of 721 nm and 631 nm for photonic crystal on glass and flexible substrate, respectively. We found that filling fraction of photonic crystal on flexible substrate is lower than that of glass substrate due to some defects.

Design and simulation of a photonic crystal resonator as a biosensor for point-of-care applications

2020 ◽  
Vol 87 (7-8) ◽  
pp. 470-476
Author(s):  
Yixiong Zhao ◽  
Kunj Himanshu Vora ◽  
Gerd vom Bögel ◽  
Karsten Seidl ◽  
Jens Weidenmüller
Keyword(s):  
Photonic Crystal ◽  
Resonant Frequency ◽  
Electromagnetic Waves ◽  
Point Of Care ◽  
Dielectric Materials ◽  
Operating Personnel ◽  
High Q ◽  
Sensing Applications ◽  
Crystal Resonator ◽  
Very High

AbstractPoint-of-care (POC) devices are essential for rapid testing of samples for early diagnosis of diseases. The accuracy and the sensitivity of the POC device depend mainly on the biosensors. The currently used POC devices require specialized operating personnel, long sample preparation time and high equipment costs. We aim to explain a bio-sensing concept using a photonic crystal (PC) resonator that would mitigate the drawbacks of the present sensing techniques. Photonic crystals consist of spatially arranged dielectric materials presenting a band gap that prevents electromagnetic waves of certain frequency range to propagate through it. PC resonators have shown to have very high sensitivities for bio-sensing applications at THz frequencies. A PC resonator with a high Q-factor is designed and simulated to detect the changes in the surrounding dielectric permittivity. As an application for detecting specific biomolecules, a protocol for surface functionalization has been explained. This will enable the selective binding of biomolecules from the sample. Shift in resonant frequency and attenuation in magnitude at the peak resonant frequency can be observed from the simulation results. These changes in the resonator properties can be indicative of the presence of a particular biomolecule or pathogen and its concentration within the sample.

Select Axial-Symmetry Cylinder-Segments as Basic Scattering Units in 2D Photonic Crystals

2013 ◽  
Vol 441 ◽  
pp. 80-83
Author(s):  
Yong Wan ◽  
He Zhang ◽  
Wan Qin Yang ◽  
Chao Li ◽  
Ming Hui Jia
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Axial Symmetry ◽  
Electromagnetic Waves ◽  
Building Blocks ◽  
Two Dimensional ◽  
Photonic Bandgaps ◽  
Crystal Lattices ◽  
Triangular Lattices

Scattering units or building blocks are the basic elements for photonic crystal lattices. Photonic bandgaps can be tuned and improved in two-dimensional (2D) triangular lattices, as well as in square lattices by introducing axial-symmetry cylinder-segments instead of cylinders as basic scattering units. Owing to the changes of bulks, reflectance effect of electromagnetic waves will be different both in TE modes and in TM modes. The widths of bandgaps for the two polarization modes can be adjusted and matched to overlap in some range.

scholarly journals Integration of bio-responsive silver in 1D photonic crystals: towards the colorimetric detection of bacteria

2020 ◽  
Vol 223 ◽  
pp. 125-135 ◽  
Author(s):  
Giuseppe M. Paternò ◽  
Liliana Moscardi ◽  
Stefano Donini ◽  
Aaron M. Ross ◽  
Silvia M. Pietralunga ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Colorimetric Detection ◽  
E Coli ◽  
1D Photonic Crystal

Colorimetric read-out of a silver/1D photonic crystal upon exposure to E. coli.

Evaluation of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings by the multi-frequency radio wave method of a slow surface electromagnetic waves

2020 ◽  
pp. 51-58
Author(s):  
Aleksandr I. Kazmin ◽  
Pavel A. Fedjunin
Keyword(s):  
Radio Wave ◽  
Noise Level ◽  
Electromagnetic Waves ◽  
Dielectric Materials ◽  
Geometric Parameters ◽  
Experimental Investigations ◽  
Wave Method ◽  
Dielectric Coatings ◽  
Surface Electromagnetic Waves ◽  
Multilayer Dielectric

One of the most important diagnostic problems multilayer dielectric materials and coatings is the development of methods for quantitative interpretation of the checkout results their electrophysical and geometric parameters. The results of a study of the potential informativeness of the multi-frequency radio wave method of surface electromagnetic waves during reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings are presented. The simulation model is presented that makes it possible to evaluate of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings. The model takes into account the values of the electrophysical and geometric parameters of the coating, the noise level in the measurement data and the measurement bandwidth. The results of simulation and experimental investigations of reconstruction of the structure of relative permittivitties and thicknesses of single-layer and double-layer dielectric coatings with different thicknesses, with different values of the standard deviation (RMS) of the noise level in the measured attenuation coefficients of the surface slow electromagnetic wave are presented. Coatings based on the following materials were investigated: polymethyl methacrylate, F-4D PTFE, RO3010. The accuracy of reconstruction of the electrophysical parameters of the layers decreases with an increase in the number of evaluated parameters and an increase in the noise level. The accuracy of the estimates of the electrophysical parameters of the layers also decreases with a decrease in their relative permittivity and thickness. The results of experimental studies confirm the adequacy of the developed simulation model. The presented model allows for a specific measuring complex that implements the multi-frequency radio wave method of surface electromagnetic waves, to quantify the potential possibilities for the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric materials and coatings. Experimental investigations and simulation results of a multilayer dielectric coating demonstrated the theoretical capabilities gained relative error permittivity and thickness of the individual layers with relative error not greater than 10 %, with a measurement bandwidth of 1 GHz and RMS of noise level 0,003–0,004.

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