Yoshikatsu Miura

Refractive index sensor based on hybrid coupler with short-range surface plasmon polariton and dielectric waveguide

An integrated sensor based on a vertical hybrid coupler composed of a short-range surface plasmon polariton (SRSPP) waveguide and a SiNx dielectric waveguide has been realized. The output power of the sensor is observed to change drastically with the refractive index of the detection liquid, and the sensing region can be adjusted by varying the width of the SiNx waveguide. The resolution is estimated to be as high as 7.3 × 10−6 refractive index units. This sensor is expected to have significantly high effective sensitivity for detecting a hundred-nanometer-thick layer owing to the highly bounded field of the SRSPP mode.

Extremely high efficient coupling between long range surface plasmon polariton and dielectric waveguide mode

To connect the surface plasmon polariton (SPP) based devices with the conventional dielectric devices is a significant issue for the further development of SPP and related applications. In this paper, extremely high efficient coupling (>99%) between long range SPP (LRSPP) waveguide mode and TM mode of dielectric waveguide has been demonstrated from a hybrid coupler, which composed of an Au (LRSPP) waveguide and a SiN (dielectric) waveguide. Based on this hybrid coupler, a polarization splitter with pure TM mode output from one arm and TE mode output from the other arm with high TE/TM extinction ratio has been realized.

Excitation of short range surface plasmon polariton mode based on integrated hybrid coupler

The excitation method of short range surface plasmon polariton mode with hybrid coupler structure is analyzed numerically.

Hybrid coupler with short range surface plasmon polariton and dielectric waveguide

A vertical coupler composed of short range surface plasmon polariton waveguide and dielectric waveguide is studied theoretically and experimentally. The short range surface plasmon polariton mode is excited efficiently by the dielectric waveguide mode within tens of microns. Meanwhile, based on the hybrid coupler, a highly compact polarizer and a high performance sensor for ultra-thin layer sensing could be achieved.

Long Range surface plasmon polariton based polarization splitter with pure TM-mode output

High performance polarization splitter, which is based on the hybrid coupler with long range surface plasmon polariton and dielectric waveguide, has been realized. Pure TM mode and high extinction ratio TE mode is obtained.