I.V. Iorsh, I.V. Shadrivov, P.A. Belov, and Yu.S. Kivshar Benasque, 03.03-08.0.3, 2013.

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Presentation transcript:

I.V. Iorsh, I.V. Shadrivov, P.A. Belov, and Yu.S. Kivshar Benasque, , 2013

Isotropic media: Disp. equation: Isofrequency surface: Hyperbolic medium: Disp. equation : Isofrequency surface : Anisotropic media: Disp. equation : Isofrequency surface:

 Transition rate (Fermi Golden Rule):  For atom in vacuum: LDOS Note: Fermi Golden Rule is not an exact result, but rather a first approximation solution of the integro-differential equation obtained from time-dependant perturbation theory

E.M. Purcell ( ) Purcell worked with RF range and small metallic Cavities: enhancement of the order of

Narimanov et al, Appl. Phys. B: 100, 215–218 (2010)

Wire medium J. Sun et al. Appl. Phys. Lett. 98, (2011) Graphite (for UV) Magnetized plasma (for RF)

 Within the effective media approximation the layered metal dielectric nanostructure can be described as a hyperbolic media

Extremum is observed at the bulk plasmon frequency.

T. Tumkur, G. Zhu, P. Black, Yu. A. Barnakov, C. E. Bonner, and M. A. Noginov, APL 99, , (2011) O. Kidway, S.V. Zhukovsky, J.E. Sipe, OL, 36,13,(2011)

But what if to utilize Purcell effect? Efficiency is very low From the other hand, THz frequency range lies well below the characteristic bulk plasmon frequencies in the conventional metal-dielectric multilayers, which significantly limits the achievable values of the Purcell factors.

1.Hyperbolic isofrequency contours in metal-dielectric nanostructures arise due to near field Bloch waves 2.Near field Bloch waves – essentially are The coupled surface plasmon polaritons 3. Graphene sheet supports surface plasmon modes which can be coupled if we organise an array of graphene sheets. Multilayer graphene structure should behave As a hyperbolic metamaterial

Phys. Rev. B 87, (2013)

Largest Purcell factors correspond to:

Vogel, Welsch, “Quantum optics”: To separate the far field and near field:

Perpendicular magnetic field couples the TE and TM polarized Bloch waves: Coupling term

 Multilayered graphene structures could be used as a new realization of hyperbolic metamaterials for THz range to boost the terahertz transitions in semiconductor devices.