Volume 13, Issue 2 (International Journal of Optics and Photonics (IJOP) Vol 13, No 2, Summer-Fall 2019)                   IJOP 2019, 13(2): 97-102 | Back to browse issues page

‎ 10.29252/ijop.13.2.97
‎ 20.1001.1.17358590.2019.13.2.8.0

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Adjustable Plasmonic Bandgap in One-Dimensional Nanograting Based on Localized and Propagating Surface Plasmons
Foozieh Sohrabi1 , Seyedeh Mehri Hamidi * 1
1- Magneto-plasmonic Lab, Laser and Plasma Research Institute, Shahid Beheshti University
Abstract:   (3597 Views)

Compared to the long history of plasmonic gratings, there are only a few studies regarding the bandgap in the propagation of plasmonic surface waves. Considering the previous studies on interpretation of plasmonic bandgap formation, we discuss this phenomenon using the effect of both surface plasmon polariton (SPP) and localized surface plasmon (LSP) for our fabricated one-dimensional metallic-polymeric grating. This structure is composed of metallic grating on the surface of PDMS with different concentration of embedded gold nanoparticles. By sweeping the incident angles, we have seen that the SPP, LSP and their coupling cause two gaps in reflection regime which are originated from SPP supported by thin film gold film and LSP supported by gold nanoparticles. The first gap is attributed to the patterned metallic film because it vanishes by increasing the nanoparticles which may destroy the pattern while the second gap can be formed by embedded nanoparticles because it becomes more considerable by raising the incubation time. Therefore, the drowning time of patterned samples (e.g. 24h, 48h, and 72h) in HAuCl4 plays the key role in adjustability of plasmonic bandgap. Notably, the interaction between SPP and LSP can be the origin of the shift in gap center from 300 to 550. To best of over knowledge, this study is the first study on the plasmonic band gap as a function of both SPP and LSP.

Keywords: One-dimensional grating, localized surface plasmon, propagative surface palsmon, gold nanoparticles.
Full-Text [PDF 470 kb]   (1887 Downloads)    
Type of Study: Applicable | Subject: General
Received: 2018/04/30 | Revised: 2019/04/13 | Accepted: 2019/06/29 | Published: 2019/12/27
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