photonic crystals – TechConnect Briefs

Light Trapping in Solar Cells Using Nanostructured Reflectors: A Responsivity-Based Model Applied to Waveguide Mode Matching

Shahriad T., Shepard S.R., Louisiana Tech University, US

Although theoretically predicted that periodic photonic nanostructures can outperform the pseudo random structures in light trapping in solar cells, still the disputation regarding this topic is at the top. To enlighten the world about the [...]

Synthesis of Poly(ST-co-COPSI)particles by soap-free emulsion copolymerization and its optical properties as photonic crystals

Choo H.S., Ha J.M., Lee K-C, Gyeongsang national University, KR

Highly charged, submicron-sized polymeric colloidal particles can self assemble into 3-dimentional(3D) opal structure which is useful template for photonic crystal. In this report, optical properties of poly[Styrene(ST)-co-Allyloxy-2-hydroxypropane sulfonic acid sodium salt(COPSI)] polymeric microspheres with number [...]

Effect of Thickness based on self-assembly of block copolymer

Lee S-W., Park N.R., Kim S.Y., Shin D.M., HongKong University, KR

Block copolymers have been investigated for fabricating functional nanomaterials due to their properties of self-assembly. We prepared polystyrene-b-poly(2-vinyl pyridine) (PS-b-P2VP) lamellar films which is hydrophobic block-hydrophilic polyelectrolyte block polymer have 57 kg/mol-b-57 kg/mol. The lamellar [...]

Broadband infrared reflecting thin films inspired by quasi-ordered photonic structures in squid tissue

Rotstein R., Sweeney A.M., Holt A., Stucky G.D., Morse D.E., UCSB, US

We present a novel synthetic approach to replicating the optical properties of quasi-ordered photonic structures in the silver-colored tissue in Loliginid squid. The squid system exhibits broadband reflectance in the visible spectrum. Rod-like polystyrene particles, [...]

Design and implementation of silicon-based optical nanostructures for integrated photonic circuit applications using Deep Reactive Ion Etching (DRIE) technique

Selvarasah S., Banyal R., Casse B.D.F., Lu W.T., Sridhar S., Dokmeci M.R., Northeastern University, US

Photonic crystals (PhC) are artificially engineered periodic structures capable of manipulating and shaping optical signals. Nanoscale photonic crystals is expected to add new functionalities to the next generation of optical integrated circuits by providing novel [...]

Laser diffraction study of inverse opals

Sinitskii A., Abramova V., Laptinskaya T., Tretyakov Yu., Moscow State University, RU

We discuss the experimental data on laser diffraction in tungsten oxide photonic crystal films with an inverse opal structure. The samples were prepared using deposition of monodisperse polystyrene microspheres onto a vertical glass substrate, infiltration [...]

Real-Time Drift Correction of a Focused Ion Beam Milling System

Freeman D., Luther-Davies B., Madden S., Australian National University, AU

We are working towards the fabrication of large periodic optical structures known as photonic crystals. A focused ion beam (FIB) is used to mill holes, which must be smooth and repeatable, with nm positional accuracy. [...]

Surface Enhanced Raman Scattering by 2D Photonic Crystals: Enhancement and Reproducibility

Netti M.C., Mahnkopf S., Lincoln J.R., Charlton M.D.B., Cox S.J., Ayliffe P., Zoorob M.E., Wilkinson J.S., Baumberg J.J., Perney N.M.B., Jaiswal S.L., Mesophotonics Ltd., UK

Surface Enhanced Raman Scattering (SERS) is a widely utilised technique to enhance the weak Raman spectrum of molecules, enabling detection and identification of ultralow concentrations of particular species. We show both experimentally and theoretically how [...]

Fabrication and Characterization of 3D Square Spiral Photonic Crystals

Jensen M.O., Summers M.A., Brett M.J., University of Alberta, CA

Three-dimensional photonic crystals can be fabricated using the glancing angle thin film deposition technique (GLAD). These nanostructured thin films consist of a periodic array of micrometer-sized silicon square spirals, as proposed by O. Toader and [...]