Mach-Zehnder refractometric sensor using long-range surface plasmon waveguides

Abstract

Articles you may be interested inEfficient end-fire coupling of surface plasmons on flat metal surfaces for improved plasmonic Mach-Zehnder interferometer J. Appl. Phys. 113, 053101 (2013); 10.1063/1.4789809 Refractive index sensor based on hybrid coupler with short-range surface plasmon polariton and dielectric waveguide Appl. Phys. Lett. 100, 111108 (2012); 10.1063/1.3693408Demonstration of long-range surface plasmon-polariton waveguide sensors with asymmetric double-electrode structures Appl.A high sensitivity refractometer based upon a long period grating Mach-Zehnder interferometer Rev.We demonstrate refractometric sensing using long-range surface plasmons on a compact integrated Mach-Zehnder interferometer (MZI) formed from thin Au stripes in Cytop with an etched microfluidic channel defining the sensing arm. The transfer characteristics of MZIs were obtained by sequentially injecting solutions of increasing refractive index in the sensing arm. A detection limit of 9 Â 10 À7 RIU was achieved at k 0 ¼ 1310 nm, limited by unbalanced losses in the sensing and reference arms. A model is proposed for the MZIs, taking into account all loss mechanisms, and may be applied to MZI sensors in other technologies. V C 2013 AIP Publishing LLC.

Theoretical biosensing performance of surface plasmon polariton Bragg gratings

“…Even though this configuration is widely commercialized, it suffers from limitations. It is an approach that is bulky and difficult to miniaturise [17].…”

“…LRSPP waveguides were integrated with Mach-Zehnder refractometric sensor [17] and the bulk sensing was investigated by injecting several sensing solutions with different refractive indices. The waveguides had a thickness of 34 nm and a width of 5 µm, the wavelength used was of 1310 nm.…”

Plasmonic Waveguide Coupled Ring Cavity for a Non-Resonant Type Refractive Index Sensor

“…In particular, any plasmonic cavities must have intrinsic metallic absorption losses, which result in linewidth broadening [ 20 ]. In order to overcome the linewidth limitation in plasmonic resonant index sensors, Mach-Zehnder interferometer (MZI) plasmonic sensors have been reported, which use the plasmonic waveguide mode of a metal-insulator-metal structure [ 21 , 22 , 23 ] or the long-range surface plasmon polariton mode of a metal stripe structure [ 24 ]. Such interferometer-type sensors use the change in output power resulting from the interference between two propagating waves.…”

Long-range surface plasmon Y-junctions for referenced biosensing

“…The Y-junction biosensor should have better bulk and surface sensing detection limits than straight waveguides [13,19] because the common noise and drift in the system are eliminated. In principle, phase-dependent MZI biosensors [4,23] are better than attenuationbased biosensors, such as straight and Y-junction waveguides. However, attenuation-based biosensors are easier to use, especially the Y-junction biosensor for which a stable baseline is easier to achieve.…”