Hybrid photon–plasmon Mach–Zehnder interferometers for highly sensitive hydrogen sensing
- 28 November 2014
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Nanoscale
- Vol. 7 (3), 924-929
- https://doi.org/10.1039/c4nr06642a
Abstract
By using PdAu nanowires as plasmonic waveguides, hybrid photon–plasmon Mach–Zehnder interferometers by integrating single-crystal PdAu alloy nanowires with silica optical microfibers are demonstrated. Based on an evanescent wave coupling technique using optical fiber tapers, surface plasmon polaritons are efficiently excited and propagated in suspended PdAu nanowires. The interference spectra show attractive properties such as broad and flexible in situ tunability with wavelength spacings ranging from ∼1 to tens of nanometers, and high extinction ratios of over 20 dB. The hybrid Mach–Zehnder interferometers show a higher sensitivity to hydrogen gas than a single-nanowire sensing approach, and the lengths of PdAu nanowires used are less than 20 μm, which are 2 or 3 orders of magnitude shorter than the lengths of Pd coatings in existing fiber-optic hydrogen sensors. Other advantages including good reversibility and low-power operation are also obtained.This publication has 32 references indexed in Scilit:
- Hydrogen sensors – A reviewSensors and Actuators B: Chemical, 2011
- Hydrogen Gas Sensing with Networks of Ultrasmall Palladium Nanowires Formed on Filtration MembranesNano Letters, 2010
- Optical microfibers decorated with PdAu nanoparticles for fast hydrogen sensingSensors and Actuators B: Chemical, 2010
- Au−Cu Alloy Nanoparticles with Tunable Compositions and Plasmonic Properties: Experimental Determination of Composition and Correlation with TheoryThe Journal of Physical Chemistry C, 2010
- Optical properties of Pd thin films exposed to hydrogen studied by transmittance and reflectance spectroscopyJournal of Applied Physics, 2010
- Fast response fiber optic hydrogen sensor based on palladium and gold nano-layersSensors and Actuators B: Chemical, 2009
- Hydrogen Sensing with Subwavelength Optical Waveguides via Porous Silsesquioxane‐Palladium NanocompositesAdvanced Materials, 2008
- Fibre optics in palladium-based hydrogen sensingJournal of Optics A: Pure and Applied Optics, 2007
- All-Optical Hydrogen-Sensing Materials Based on Tailored Palladium Alloy Thin FilmsAnalytical Chemistry, 2004
- Hydrogen Sensors and Switches from Electrodeposited Palladium Mesowire ArraysScience, 2001