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25 April 2012 Group velocity control of reflected pulses in asymmetric Fabry-Perot filters
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Abstract
In this work, we show group delay tuning from superluminal/tunneling to subluminal pulse reflection on asymmetric Fabry-Perot filters with quarter-wavelength Bragg reflectors. As opposed to other photonic band-gap systems, reflected pulse delay control occurs in an entirely linear and passive asymmetric structure where the tuning mechanism consists in adjusting the mirrors spacing or the attenuation. Our results are obtained in the radiofrequency (RF) range through frequency- and time-domain characterization of Fabry-Perot filters based on high and low impedance coaxial cables. Group delay predictions within the phase-time approach were supported by pulse delay measurements of a modulated RF wave-packet tuned at the mirrors Bragg frequency. Superluminal, subluminal and tunnelling pulse reflection was detected, respectively, for mirror spacing adjusted to λ/4, λ/2 and 3λ/2 (where λ is the mirrors design wavelength). Fractional delays similar to those predicted in active asymmetric fiber Bragg gratings were obtained. These RF operating devices could be scaled to their analogous structures in the optical range and are proposed as an alternative to active or non-linear media for group velocity control.
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A. Sánchez-Meroño, M. M. Sánchez-López, J. Arias, and I. Moreno "Group velocity control of reflected pulses in asymmetric Fabry-Perot filters", Proc. SPIE 8425, Photonic Crystal Materials and Devices X, 84251S (25 April 2012); https://doi.org/10.1117/12.922304
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