Plasmonics of topological insulators

We discuss the plasmonic properties of chalcogenide topological insulators arising from interband transitions and Drude-like response of metallic surface states in the UV to mid-IR, which provide a new platform for electronics and photonics integration

International Journal of Emerging Technologies in Computational and Applied Sciences (IJETCAS) www.iasir.net Mathematical Analysis of Asymmetrical Spectral Lines

I. Introduction The form of the spectral components (lines and bands) and their parameters, such as location, intensity, width and statistical moments, constitute the main source of spectrochemical informatio

Graphene-based tunable plasmonic Bragg reflector with a broad bandwidth.

We propose and numerically analyze a plasmonic Bragg reflector formed in a graphene waveguide. The results show that the graphene plasmonic Bragg reflector can produce a broadband stopband that can be tuned over a wide wavelength range by a small change in the Fermi energy level of graphene. By introducing a defect into the Bragg reflector, we can achieve a Fabry-Perot-like microcavity with a quality factor of 50 for the defect resonance mode formed in the stopband. The proposed Bragg reflector could be used as a broadband ultrafast tunable integrated filter and a broadband modulator. In addition, the defect microcavity may find applications in graphene-based resonators

The reduction of surface plasmon losses in quasi-suspended graphene.

Highly confined surface plasmons on graphene attract substantial interest as potential information carriers for highly integrated photonic data processing circuits. However, plasmon losses remain the main obstacle for implementation of such devices. In near-field microscopic experiments performed at the wavelength of 10 μm we show that a substantial reduction of plasmon damping can be achieved by placing a nanometric polymer nano-dots spacer between the graphene layer and the supporting silicon oxide slab making graphene quasi-suspended. We argue that reduction of plasmon losses is attributed to weaker coupling with substrate phonons in the quasi-suspended graphene

Visible range plasmonic modes on topological insulator nanostructures

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