Photonic Wire Bragg Gratings, made by periodic insertion of lateral rectangular recesses into photonic wires in silicon-on-insulator, can provide large reflectivity with short device lengths because of their large index contrast. This type of design shows a counter-intuitive behaviour, as we demonstrate — using experimental and numerical data — that it can have low or null reflectance, even for large indentation values. We provide physical insight into this phenomenon by developing a model based on Bloch mode theory, and are able to find an analytical expression for the frequency at which the grating does not sustain the stop-band. Finally we demonstrate that the stop-band closing effect is a general phenomenon that may occur in various types of periodic device that can be modeled as transmission line structures.

Closure of the stop-band in photonic wire Bragg gratings / M Gnan; W C L Hopman; G Bellanca; R M de Ridder; R M De La Rue; P Bassi. - In: OPTICS EXPRESS. - ISSN 1094-4087. - ELETTRONICO. - 17:(2009), pp. 8830-8842. [10.1364/OE.17.008830]

Closure of the stop-band in photonic wire Bragg gratings

GNAN, MARCO;BASSI, PAOLO
2009

Abstract

Photonic Wire Bragg Gratings, made by periodic insertion of lateral rectangular recesses into photonic wires in silicon-on-insulator, can provide large reflectivity with short device lengths because of their large index contrast. This type of design shows a counter-intuitive behaviour, as we demonstrate — using experimental and numerical data — that it can have low or null reflectance, even for large indentation values. We provide physical insight into this phenomenon by developing a model based on Bloch mode theory, and are able to find an analytical expression for the frequency at which the grating does not sustain the stop-band. Finally we demonstrate that the stop-band closing effect is a general phenomenon that may occur in various types of periodic device that can be modeled as transmission line structures.
2009
Closure of the stop-band in photonic wire Bragg gratings / M Gnan; W C L Hopman; G Bellanca; R M de Ridder; R M De La Rue; P Bassi. - In: OPTICS EXPRESS. - ISSN 1094-4087. - ELETTRONICO. - 17:(2009), pp. 8830-8842. [10.1364/OE.17.008830]
M Gnan; W C L Hopman; G Bellanca; R M de Ridder; R M De La Rue; P Bassi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/77657
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