Tunneling of single-cycle terahertz pulses through waveguides

K. Wynne, J.J. Carey, J. Zawadzka, D.A. Jaroszynski

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Propagation of single-cycle terahertz pulses through and past wavelength-sized metal structures has been studied experimentally. In waveguides close to cutoff, it is found that the phase velocity can become superluminal and even negative. Multiple reflections of evanescent waves inside the waveguide are found to be the cause of a negative phase velocity below the cutoff frequency. The centroid delay of terahertz pulses propagating past a thin metal wire is found to be advanced or delayed depending on the polarization with respect to the wire. In all cases of superluminal propagation described here, the principle of causality is preserved. In a restricted sense, exchange of information faster than the speed of light is found possible, however, the principle of causality ensures that information cannot advance by more than the inverse bandwidth of the signal. This eliminates causal-loop paradoxes and ensures that faster-than-light communication is not practical.
LanguageEnglish
Pages429-435
Number of pages6
JournalOptics Communications
Volume176
Issue number4-6
DOIs
Publication statusPublished - 1 Apr 2000

Fingerprint

Phase velocity
phase velocity
Waveguides
cut-off
Metals
wire
Wire
waveguides
Light velocity
cycles
propagation
evanescent waves
paradoxes
Cutoff frequency
Optical communication
pulses
metals
centroids
optical communication
Polarization

Keywords

  • single-cycle terahertz pulses

Cite this

Wynne, K. ; Carey, J.J. ; Zawadzka, J. ; Jaroszynski, D.A. / Tunneling of single-cycle terahertz pulses through waveguides. In: Optics Communications. 2000 ; Vol. 176, No. 4-6. pp. 429-435.
@article{a02c2c636690458798661c411a33a4f4,
title = "Tunneling of single-cycle terahertz pulses through waveguides",
abstract = "Propagation of single-cycle terahertz pulses through and past wavelength-sized metal structures has been studied experimentally. In waveguides close to cutoff, it is found that the phase velocity can become superluminal and even negative. Multiple reflections of evanescent waves inside the waveguide are found to be the cause of a negative phase velocity below the cutoff frequency. The centroid delay of terahertz pulses propagating past a thin metal wire is found to be advanced or delayed depending on the polarization with respect to the wire. In all cases of superluminal propagation described here, the principle of causality is preserved. In a restricted sense, exchange of information faster than the speed of light is found possible, however, the principle of causality ensures that information cannot advance by more than the inverse bandwidth of the signal. This eliminates causal-loop paradoxes and ensures that faster-than-light communication is not practical.",
keywords = "single-cycle terahertz pulses",
author = "K. Wynne and J.J. Carey and J. Zawadzka and D.A. Jaroszynski",
year = "2000",
month = "4",
day = "1",
doi = "10.1016/S0030-4018(00)00542-3",
language = "English",
volume = "176",
pages = "429--435",
journal = "Optics Communications",
issn = "0030-4018",
number = "4-6",

}

Tunneling of single-cycle terahertz pulses through waveguides. / Wynne, K.; Carey, J.J.; Zawadzka, J.; Jaroszynski, D.A.

In: Optics Communications, Vol. 176, No. 4-6, 01.04.2000, p. 429-435.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Tunneling of single-cycle terahertz pulses through waveguides

AU - Wynne, K.

AU - Carey, J.J.

AU - Zawadzka, J.

AU - Jaroszynski, D.A.

PY - 2000/4/1

Y1 - 2000/4/1

N2 - Propagation of single-cycle terahertz pulses through and past wavelength-sized metal structures has been studied experimentally. In waveguides close to cutoff, it is found that the phase velocity can become superluminal and even negative. Multiple reflections of evanescent waves inside the waveguide are found to be the cause of a negative phase velocity below the cutoff frequency. The centroid delay of terahertz pulses propagating past a thin metal wire is found to be advanced or delayed depending on the polarization with respect to the wire. In all cases of superluminal propagation described here, the principle of causality is preserved. In a restricted sense, exchange of information faster than the speed of light is found possible, however, the principle of causality ensures that information cannot advance by more than the inverse bandwidth of the signal. This eliminates causal-loop paradoxes and ensures that faster-than-light communication is not practical.

AB - Propagation of single-cycle terahertz pulses through and past wavelength-sized metal structures has been studied experimentally. In waveguides close to cutoff, it is found that the phase velocity can become superluminal and even negative. Multiple reflections of evanescent waves inside the waveguide are found to be the cause of a negative phase velocity below the cutoff frequency. The centroid delay of terahertz pulses propagating past a thin metal wire is found to be advanced or delayed depending on the polarization with respect to the wire. In all cases of superluminal propagation described here, the principle of causality is preserved. In a restricted sense, exchange of information faster than the speed of light is found possible, however, the principle of causality ensures that information cannot advance by more than the inverse bandwidth of the signal. This eliminates causal-loop paradoxes and ensures that faster-than-light communication is not practical.

KW - single-cycle terahertz pulses

UR - http://dx.doi.org.10.1016/S0030-4018(00)00542-3

U2 - 10.1016/S0030-4018(00)00542-3

DO - 10.1016/S0030-4018(00)00542-3

M3 - Article

VL - 176

SP - 429

EP - 435

JO - Optics Communications

T2 - Optics Communications

JF - Optics Communications

SN - 0030-4018

IS - 4-6

ER -