以共振腔調制之表面電漿子引發金屬薄膜共振穿隧效應

Resonant Tunneling Effects on Cavity-embedded Metal Film Caused by Surface Plasmon Excitation

藍永強(Yung-Chiang Lan)

《光學工程》 107期 (2009/06) Pp. 42-50

https://doi.org/10.30011/OE.200906.0011

摘要

本文探討以共振腔調制之具有週期性溝槽結構金屬薄膜的共振穿隧效應，金屬薄膜崁入長條形共振腔對共振穿隧頻率有兩種影響，即耦合模態與波導模態。對耦合模態而言，溝槽結構與共振腔間的共振穿隧與共振腔本身共同形成一個耦合共振系統；而在波導模態中，共振腔只扮演電漿子波導的角色，因此共振穿隧頻率接近溝槽結構的共振吸收頻率而與共振腔的性質無關。

關鍵字

表面電漿子 ； 共振穿隧效應 ； 電漿子波導 ； 電漿子共振腔

並列摘要

This work investigates cavity-modulated resonant tunneling through a silver film with periodic grooves on both surfaces. A strip cavity embedded in the film affects tunneling frequencies via a coupling mode and waveguide mode. In coupling mode, both the resonant tunneling through the gap between the groove and cavity and the cavity itself form an entire resonant structure. In the waveguide mode, however, the cavity functions as a surface plasmon waveguide. Hence, tunneling frequencies are close to resonant absorption frequencies of the groove structure and irrelevant to cavity properties.

並列關鍵字

Surface plasmon SP ； resonant tunneling ； SP waveguide ； SP cavity