skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Formation of collimated beams behind the woodpile photonic crystal

Abstract

We experimentally observe formation of narrow laser beams behind the woodpile photonic crystal, when the beam remains well collimated in free propagation behind the crystal. We show that the collimation depends on the input laser beam's focusing conditions, and we interpret theoretically the observed effect by calculating the spatial dispersion of propagation eigenmodes and by numerical simulation of paraxial propagation model.

Authors:
; ;  [1];  [2]; ; ; ;  [3];  [4];  [1];  [5]
  1. Departament de Fisica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, Colom 11, E-08222 Terrassa, Barcelona (Spain)
  2. Division of Global Research Leaders (Research Institute of Electronics), Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561 (Japan)
  3. Laser Research Center, Department of Quantum Electronics, Vilnius University, Sauletekio al 10, LT-10222 Vilnius (Lithuania)
  4. Swinburne University of Technology, Centre for Micro-Photonics, John Street, Hawthorn, VIC 3122 (Australia)
  5. (ICREA), Passeig Lluis Companys, 23, E-08010, Barcelona (Spain)
Publication Date:
OSTI Identifier:
22072178
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 84; Journal Issue: 3; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPUTERIZED SIMULATION; DISPERSIONS; FOCUSING; INTERFERENCE; LASERS; PHOTON BEAMS

Citation Formats

Trull, J., Maigyte, L., Cojocaru, C., Mizeikis, V., Malinauskas, M., Rutkauskas, M., Peckus, M., Sirutkaitis, V., Juodkazis, S., Staliunas, K., and Institucio Catalana de Recerca i Estudis Avancats. Formation of collimated beams behind the woodpile photonic crystal. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.033812.
Trull, J., Maigyte, L., Cojocaru, C., Mizeikis, V., Malinauskas, M., Rutkauskas, M., Peckus, M., Sirutkaitis, V., Juodkazis, S., Staliunas, K., & Institucio Catalana de Recerca i Estudis Avancats. Formation of collimated beams behind the woodpile photonic crystal. United States. doi:10.1103/PHYSREVA.84.033812.
Trull, J., Maigyte, L., Cojocaru, C., Mizeikis, V., Malinauskas, M., Rutkauskas, M., Peckus, M., Sirutkaitis, V., Juodkazis, S., Staliunas, K., and Institucio Catalana de Recerca i Estudis Avancats. Thu . "Formation of collimated beams behind the woodpile photonic crystal". United States. doi:10.1103/PHYSREVA.84.033812.
@article{osti_22072178,
title = {Formation of collimated beams behind the woodpile photonic crystal},
author = {Trull, J. and Maigyte, L. and Cojocaru, C. and Mizeikis, V. and Malinauskas, M. and Rutkauskas, M. and Peckus, M. and Sirutkaitis, V. and Juodkazis, S. and Staliunas, K. and Institucio Catalana de Recerca i Estudis Avancats},
abstractNote = {We experimentally observe formation of narrow laser beams behind the woodpile photonic crystal, when the beam remains well collimated in free propagation behind the crystal. We show that the collimation depends on the input laser beam's focusing conditions, and we interpret theoretically the observed effect by calculating the spatial dispersion of propagation eigenmodes and by numerical simulation of paraxial propagation model.},
doi = {10.1103/PHYSREVA.84.033812},
journal = {Physical Review. A},
number = 3,
volume = 84,
place = {United States},
year = {Thu Sep 15 00:00:00 EDT 2011},
month = {Thu Sep 15 00:00:00 EDT 2011}
}
  • A compact planar channel four-port drop filter is developed experimentally and theoretically in the three-dimensional woodpile photonic crystal having a complete band gap. This consists of two waveguides separated by a defect in a single layer of the photonic crystal. Frequencies for channel dropping can be tuned throughout the band gap, by changing the size of the defect. Quality factors of {approx}1000 were measured. Simulations demonstrate directional energy transfer between the input and out put waveguides, through excitation of fields in the defect region. The planar nature of the filter is much more amenable to fabrication at optical length wavelengths.
  • We describe initial steps at fabricating a dielectric photonic bandgap accelerator structure designed to operate at near IR frequencies. Such a structure operating at these frequencies requires extremely small, sub-micron sized features, forcing one to use lithographic means for fabrication. A process based upon lithographic equipment at the Stanford Nanofabrication Facility has been developed and a four layer test structure has been fabricated. Unexpected problems with the final etch step, and corresponding modifications to the process flow addressing these problems, are described. Spectroscopic measurements of the structure have been taken and are compared to simulations.
  • An approach to switching between different patterns of light beams transmitted through the woodpile photonic crystals filled with liquid crystals is proposed. The phase transition between the nematic and isotropic liquid crystal states leads to an observable variation of the spatial pattern transmitted through the photonic structure. The transmission profiles in the nematic phase also show polarization sensibility due to refractive index dependence on the field polarization. The experimental results are consistent with a numerical calculation by Finite Difference Time Domain method.
  • We report the fabrication and characterization of woodpile photonic crystals with up to 12 layers through titania nanoparticle infiltration of a polymer template made by soft lithography. Because the complicated alignment in the conventional layer-by-layer fabrication associated with diamondlike symmetry is replaced by a simple 90{sup o} alignment, the fabricated photonic crystal has semicrystalline phase. However, the crystal performs similarly to a perfectly aligned crystal for the light propagation integrated from the surface normal to 30{sup o} at the main photonic band gap.
  • The authors describe the fabrication and characterization of three dimensional silicon inverse woodpile photonic crystals. A dual exposure, two-photon, conformal phasemask technique is used to create high quality polymer woodpile structures over large areas with geometries that quantitatively match expectations based on optical simulations. Depositing silicon into these templates followed by the removal of the polymer results in silicon inverse woodpile photonic crystals for which calculations indicate a wide, complete photonic bandgap over a range of structural fill fractions. Spectroscopic measurements of normal incidence reflection from both the polymer and siliconphotonic crystals reveal good optical properties.