Abstract

Threshold conditions to realize electric field enhancement and energy confinement in the low-refractive-index core of nanoscale waveguides are studied by solving the field function. When the incident lightwave meets the relation of special thresholds, we observe the enhanced electric field and a concentrated light energy in the core. The electric field enhancement and the confined light power are highly dependent on the light wavelength. When the core width is 30 nm, for a wavelength of 1.55 µm, we achieve a power confinement factor above 40%. As the basis for a growing number of potential applications, the threshold conditions discovered in this work will find significant applications in many fields, such as optical sensors and optical communication components.

© 2020 Optical Society of America

Hybrid plasmonic grating slot waveguide with high field enhancement for an on-chip surface-enhanced Raman scattering sensor

Shiyu Li, Li Xia, Zhao Yang, Minghui Zhou, Benyang Zhao, and Wei Li
Appl. Opt. 59(3) 748-755 (2020)

Ultrashort inverted tapered silicon ridge-to-slot waveguide coupler at 1.55 µm and 3.392 µm wavelength

M. A. Butt, S. N. Khonina, and N. L. Kazanskiy
Appl. Opt. 59(26) 7821-7828 (2020)

Hollow hybrid plasmonic waveguide for nanoscale optical confinement with long-range propagation

Tarun Sharma and Mukesh Kumar
Appl. Opt. 53(9) 1954-1957 (2014)

In-plane electric field confinement engineering in graphene-based hybrid plasmonic waveguides

Binbin Wang, Sylvain Blaize, Sera Kim, Heejun Yang, and Rafael Salas-Montiel
Appl. Opt. 58(27) 7503-7509 (2019)

Tunable broadband optical field enhancement in graphene-based slot waveguide at infrared frequencies

Wanli Lu
Appl. Opt. 55(19) 5095-5101 (2016)