Hollow hybrid plasmonic Mach-Zehnder sensor.

A Mach-Zehnder interferometer (MZI)-based liquid refractive index sensor, utilizing a hollow hybrid plasmonic (HP) waveguide as the sensing element, has been investigated, showing large sensitivity to the refractive index changes of the tested liquids, as well as lower propagation loss in comparison to typical plasmonic waveguide-based ones. The sensor is fabricated using conventional silicon-on-insulator (SOI) technology; therefore, it is compatible to other standard SOI devices. The waveguide sensitivity, Sw, is experimentally demonstrated to be 0.64, with a propagation loss less than 0.25 dB/μm. Using a 20  μm long hollow HP waveguide in the sensing arm, the sensitivity of the MZI sensor (device sensitivity, Sd) is about 160 nm/RIU, with an extinction ratio larger than 40 dB.

[1]  P. Bienstman,et al.  Label-Free Biosensing With a Slot-Waveguide-Based Ring Resonator in Silicon on Insulator , 2009, IEEE Photonics Journal.

[2]  J. Aitchison,et al.  Analysis and Optimization of Hybrid Plasmonic Waveguide as a Platform for Biosensing , 2014, IEEE Photonics Journal.

[3]  Xudong Fan,et al.  Characterization of sensing capability of optofluidic ring resonator biosensors , 2010 .

[4]  Pavel Cheben,et al.  Evanescent field waveguide sensing with subwavelength grating structures in silicon-on-insulator. , 2014, Optics letters.

[5]  Francesco Dell'Olio,et al.  Optical sensing by optimized silicon slot waveguides. , 2007, Optics express.

[6]  X. Chen,et al.  All-Optical Switching Using a Hybrid Plasmonic Donut Resonator With Photothermal Absorber , 2016, IEEE Photonics Technology Letters.

[7]  L. Lechuga,et al.  An integrated optical interferometric nanodevice based on silicon technology for biosensor applications , 2003 .

[8]  Sailing He,et al.  A silicon-based hybrid plasmonic waveguide with a metal cap for a nano-scale light confinement. , 2009, Optics express.

[9]  B. Lamontagne,et al.  A Silicon-on-Insulator Photonic Wire Based Evanescent Field Sensor , 2006, IEEE Photonics Technology Letters.

[10]  A. M. Jorgensen,et al.  Lab-on-a-chip with integrated optical transducers. , 2006, Lab on a chip.

[11]  Qianfan Xu,et al.  Experimental demonstration of guiding and confining light in nanometer-size low-refractive-index material. , 2004, Optics letters.

[12]  Ke Ma,et al.  Sensitivity Enhancement in Si Nanophotonic Waveguides Used for Refractive Index Sensing , 2016, Sensors.

[13]  Lech Wosinski,et al.  High-sensitivity liquid refractive-index sensor based on a Mach-Zehnder interferometer with a double-slot hybrid plasmonic waveguide. , 2015, Optics express.

[14]  Raluca Dinu,et al.  High-speed plasmonic phase modulators , 2014, Nature Photonics.

[15]  D. Dai,et al.  Highly sensitive Si nanowire-based optical sensor using a Mach-Zehnder interferometer coupled microring. , 2010, Optics letters.

[16]  Lech Wosinski,et al.  Highly efficient nonuniform grating coupler for silicon-on-insulator nanophotonic circuits. , 2010, Optics letters.

[17]  X. Zhang,et al.  A hybrid plasmonic waveguide for subwavelength confinement and long-range propagation , 2008 .