Abstract
Resonances in micrometer metallic cavities are very important for the interactions between materials and light. Triangular, trapezoidal and W-shaped cavities are investigated through the finite difference time domain (FDTD) method. Surface plasmon polariton resonant (SPPR) dark and bright modes are excited on the sides of triangular and trapezoidal cavities. When the trapezoidal cavity is shaped to W-shaped cavity, localized surface plasmon resonance (LSPR) is excited at the tip of wedge. The LSPR with narrow bandwidth interferes destructively with SPPR dark and bright modes with wide bandwidth on the sides of cavity, forming localized surface plasmon induced transparency (LSPIT) and Fano resonance (LSPFR), respectively. Comparative to general cavity-resonance (CR) modes with at least one dimension larger than half of wavelength in 2D structures, the LSPR can be confined to an ultra-small scale with both two dimensions less than half of wavelength. The LSPIT and LSPFR can be applied to enhance the spatial resolution of sensor and design sensors to sense particle’s size, position and refractive index in several-nm scale.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
