Title :
Frequency-domain detection of superluminal group velocity in a distributed Bragg reflector
Author :
Mojahedi, Mohammad ; Schamiloglu, Edl ; Agi, Kamil ; Malloy, Kevin J.
Author_Institution :
Center for High Technol. Mater., New Mexico Univ., Albuquerque, NM, USA
fDate :
4/1/2000 12:00:00 AM
Abstract :
Using a free-space configuration and a frequency-domain detection setup, group velocities of electromagnetic waves in a distributed Bragg reflector are investigated. Experimental data indicate that, near the regions of minimal transmission in our configuration, the group velocity is 2.1 times faster than the speed of light in vacuum. A transmission model based on diagonalization of the transfer matrix is used to compare the experimental data and the theoretical calculations, and good agreement is obtained. An overview of the experimental uncertainties and their effects on the measured quantities is provided.
Keywords :
dispersive media; electromagnetic wave propagation; frequency-domain analysis; light velocity measurement; measurement uncertainty; mirrors; transmission line matrix methods; tunnelling; K-band standard horn antennas; dispersive medium; distributed Bragg reflector; electromagnetic wave group velocity; experimental uncertainties; free-space configuration; frequency-domain detection; minimal transmission regions; photonic tunneling time; sensitivity analysis; speed of light; superluminal group velocity; transfer matrix diagonalization; transmission model; Distributed Bragg reflectors; Electromagnetic measurements; Electromagnetic propagation; Electromagnetic scattering; Electrons; Optical surface waves; Photonic crystals; Surface emitting lasers; Tunneling; Vertical cavity surface emitting lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
