# Graduate School in Nonlinear Science

**
MIDIT OFD CATS
Modelling, Nonlinear Dynamics Optics and Fluid Dynamics Chaos and Turbulence Studies
and Irreversible Thermodynamics Risø National Laboratory Niels Bohr Institute and
Technical University of Denmark Building 128 Department of Chemistry
Building 321 P.O. Box 49 University of Copenhagen
DK-2800 Lyngby DK-4000 Roskilde DK-2100 Copenhagen Ø
Denmark Denmark Denmark
**

**PHOTONIC CRYSTALS: A REVIEW **

**by Steffen Kjær Johansen**

Informatics and Mathematical
Modelling (IMM)

Technical University of Denmark

Building 321

2800 Kgs. Lyngby, Denmark

MIDIT-seminar 509

**Friday, June 07, 2002, 11.00 h**

at IMM, Bldg. 305, Room 053, DTU

**Abstract:**
Photonic crystals are the optical analogues of semiconductors in the
electronics industry. Rather than a microscopic periodic lattice of
atoms which modifies the behaviour of electrons, photonic crystals
possess a macroscopic periodic dielectric constant which modifies the
properties of light. Just as electrons having energies in the
forbidden semiconductor band gap cannot propagate, photonic crystals
exhibit a frequency regime, the photonic band gap, over which the
propagation of light is strictly forbidden.
In the talk I shall introduce the basic concepts and the (linear)
theory describing electromagnetic wave propagation in photonic
crystals.
J.D. Joannopoulos, R.D. Meade, J.N. Winn, Photonic Crystals.
(Princeton University Press, Princeton, New Jersey, 1995)