Engineered Metasurface of Gold Funnels for Terahertz Wave Filtering
- 101 Downloads
Surface plasmon polariton (SPP) excitation of the coupled light at small contact area of chromium pillars as the interface of metastructured gold funnel layer and silica medium can be enhanced locally in the gold meta-funnel-structured filter. In the present investigation, the filter is comprised of three layers, namely gold meta-funnels, nano-sized chromium pillars, and silica as the substrate. The incoming infrared (IR) waves, coupled with the excited plasmons at the first and second layers, form an excitation, known as deformed plasmon polariton. Asymmetric distribution of localized SPPs takes place owing to the inherent converging plasmonic feature of the gold funnel structure. The formation of reflection peaks with different magnitudes at different incidence angles of the polarized wave in the spectral characteristics makes the structure prominent for filtering the IR waves. Moreover, the gold meta-funnel-structured filter possesses the additional feature of distinguishing the type of polarized incidence wave. It was found that the transmission remains maximum corresponding to the normal incidence of the TE-polarized waves, whereas the TM-polarized waves over the same wavelength range are almost blocked for any value of incidence angle. The existence of transmission peaks corresponding to the TE waves demonstrates another application of this device as metastructured polarizer filter.
KeywordsMetamaterials Metamaterial-based filters Terahertz filters Photonic structures
The authors gratefully acknowledge the financial support received from the Ministry of Higher Education (Malaysia) to conduct the work through the grant AKU95. Also, the authors are thankful to two anonymous reviewers for constructive criticisms on the manuscript.
- 2.Rakheja S, Kumar V (2012) Comparison of electrical, optical and plasmonic on-chip interconnects based on delay and energy considerations. Proc. of the 13th International Symposium on Quality Electronic Design (ISQED) 732−739. https://doi.org/10.1109/ISQED.2012.6187573
- 3.Sun S, Badawy AHA, Narayana V, El-Ghazawi T, Sorger VJ (2015) The case for hybrid photonic plasmonic interconnects (HyPPIs): low-latency energy-and-area-efficient on-chip interconnects. IEEE Photonics J 7:1–15Google Scholar
- 10.Polo J, Mackay TG, Lakhtakia A (2013) Electromagnetic surface waves: a modern perspective. Elsevier, AmsterdamGoogle Scholar
- 19.Li K, Stockman MI, Bergman DJ (2003) Self-similar chain of metal nanospheres as an efficient nanolens. Phys Rev Lett 91:227402–1–227402–4Google Scholar
- 20.Dai J, Čajko F, Tsukerman I, Stockman MI (2008) Electrodynamic effects in plasmonic nanolenses. Phys Rev B 77:115419–1–115419–5Google Scholar
- 28.Gottwald F, Toennesen T, Steinbuch D (2006) Microwave antenna. U.S. Patent 7019707Google Scholar