Fiber-optic nanorefractometer based on one-dimensional photonic-bandgap structures with two defects

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2004Version
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10.1109/TNANO.2004.828549
Abstract
A theoretical analysis of a fiber-optic photonic-
bandgap (PBG)-based nanorefractometer is presented.
Changes up to 11.2 dB in the optical output power in an index
of refraction range of 1.7 with a sensitivity of 1.5 10 4 have
been demonstrated. The design is based on a one-dimensional
PBG structure with two defects, which originates two defect states
inside the bandgap. These states corres ...
[++]
A theoretical analysis of a fiber-optic photonic-
bandgap (PBG)-based nanorefractometer is presented.
Changes up to 11.2 dB in the optical output power in an index
of refraction range of 1.7 with a sensitivity of 1.5 10 4 have
been demonstrated. The design is based on a one-dimensional
PBG structure with two defects, which originates two defect states
inside the bandgap. These states correspond to two localized
modes in the defects. By selecting adequate parameters, the
frequency of one of the localized modes can be fixed at the same
time that its peak amplitude varies with the refractive index of the
defect associated to the other localized mode. The refractive index
of the defect associated to the localized mode that has been fixed
in frequency remains constant. This enables a detection scheme
based on a simple photodetector instead of an optical spectrum
analyzer, as usual. The thickness of the defect whose refractive
index varies determines the variation range of the transmitted
power amplitude peak of the localized mode fixed at a concrete
frequency. In addition, an analysis of the nonlinear dependence on
the refractive index of the peak-transmitted power of the localized
mode fixed at a concrete frequency is presented. [--]
Subject
Publisher
IEEE
Published in
IEEE Transactions on Nanotechnology, Vol. 3, 2, June 2004, pp. 293 - 299
Departament
Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónica /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektriko eta Elektronikoa Saila
Publisher version
Sponsorship
This work was supported by Spanish
Ministerio de Ciencia y Tecnologia and FEDER Research Grants CICYT-TIC
2003-00909 and CICYT-TIC 2001-0877-C02-02; Gobierno de Navarra and FPU MECD Grant.