Terahertz composite plasmonic slabs based on double-layer metallic gratings

Optics Express
Dejun LiuFeng Liu

Abstract

One composite plasmonic slab with a broad bandgap (40%) is experimentally and numerically demonstrated in the terahertz (THz) region. The composite slab consists of double-layer metallic gratings and a dielectric film, which supports two resonant modes. Electric field vectors and charge distributions proved that the low-frequency resonant mode originates from the symmetric plasmonic mode, while the high-frequency resonant mode is induced by the hybrid mode of plasmonic and dielectric modes. Compared with the double-layer metallic grating, the inserted dielectric film significantly enhances the transmission of the transverse magnetic (TM) waves and induces Fano resonances. The near-field coupling between metal gratings and dielectric film can be manipulated by changing the thickness and the refractive index of dielectric films. We further demonstrated that the plasmonic bandgap can be manipulated by tuning the grating width. These results suggest that this composite plasmonic slab is promising in terahertz integrated components development such as a filter, polarizer, or sensor.

References

Aug 15, 2003·Nature·William L BarnesThomas W Ebbesen
Nov 19, 2004·Nature·Kanglin Wang, Daniel M Mittleman
Jun 27, 2008·Nano Letters·André ChristSergei G Tikhodeev
Aug 6, 2009·Optics Express·J W LeeDaniel M Mittleman
Apr 7, 2010·Physical Review Letters·Stéphane CollinJean-Luc Pelouard
Dec 15, 2010·Angewandte Chemie·Na Liu, Harald Giessen
Mar 19, 2013·Optics Letters·Marcin StolarekTomasz Szoplik
Nov 5, 2014·Scientific Reports·Zhonglai Zhang, Jian Wang
May 15, 2015·Optics Express·Guozhen LiChongjun Jin
Feb 24, 2016·Scientific Reports·Lin ChenSongLin Zhuang
Mar 16, 2017·Scientific Reports·Ming Lun TsengDin Ping Tsai

❮ Previous
Next ❯

Related Concepts

Related Feeds

Cell Imaging in CNS

Here is the latest research on cell imaging and imaging modalities, including light-sheet microscopy, in the central nervous system.