Grating-Assisted Excitation of Short-Range Surface Plasmon Polariton Mode
- Resource Type
- Periodical
- Authors
- Liu, Q.; Kee, J. S.; Park, M. K.
- Source
- IEEE Photonics Technology Letters IEEE Photon. Technol. Lett. Photonics Technology Letters, IEEE. 25(15):1420-1423 Aug, 2013
- Subject
- Engineered Materials, Dielectrics and Plasmas
Photonics and Electrooptics
Gratings
Gold
Propagation losses
Dielectrics
Indexes
Couplings
Bragg gratings
long-range surface plasmon
short-range surface plasmon
optical filters
optical sensors
- Language
- ISSN
- 1041-1135
1941-0174
We propose an anti-symmetric grating structure for effective excitation of the short-range surface plasmon polariton (SR-SPP) mode of a metal stripe waveguide. The structure consists of two corrugated Bragg gratings offset by half of a period formed on the two sides of the metal stripe, respectively. The SR-SPP mode is excited in the backward direction by the long-range surface plasmon polariton mode launched into the waveguide. We investigate the effects of the metal stripe thickness, the grating corrugation depth, and the number of grating periods on the transmission and reflection characteristics of the grating with the finite-difference time-domain method in detail. Our numerical results show that a peak reflection of ${\sim}{57\%}$ in the SR-SPP mode can be achieved with a 50-$\mu{\rm m}$ long grating on a 40-nm thick gold stripe.