Experimental observation of superluminal pulse reflection in a double-Lorentzian photonic band gap

被引：38

作者：

Longhi, S. ^{[1
]}

Marano, M. ^{[1
]}

Laporta, P. ^{[1
]}

Belmonte, M. ^{[2
]}

Crespi, P. ^{[2
]}

机构：

[1] Ist. Naz. per la Fis. della Materia, Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, 1-20133 Milano, Italy

[2] Corning-Optical T.Italia S.p.A., Viale Sarca 222, 1-20126 Milano, Italy

来源：

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | 2002年 / 65卷 / 04期

关键词：

Band structure - Cesium - Fiber Bragg gratings - Light absorption - Light propagation - Light reflection - Light transmission - Optical waveguides - Oscillations - Photons;

D O I：

10.1103/PhysRevE.65.045602

中图分类号：

学科分类号：

摘要：

We report on the experimental observation of superluminal reflection of picosecond optical pulses at 1.5 μm using a specially designed 30-cm-long fiber Bragg grating (FBG) that realizes a spectral reflectivity profile given by the superposition of two closely spaced Lorentzian lines. Probing pulses of 380 ps duration tuned midway between the two Lorentzian lines are reflected without appreciable distortion with a measured peak pulse advancement of 60 ps. The achievement of the negative group delay is due to the interference of the two resonance modes of the FBG structure and has a close connection to the phenomenon of negative group velocity for pulse propagation in an inverted medium possessing a doublet line. © 2002 The American Physical Society.

引用

页码：1 / 045602