Research Project No AR-30/12: “All optical amplifying and coding devices with combined waveguides” has been selected in 2012 applied research grant competition. Project manager – Associate Professor from Ivane Javakhishvili Tbilisi State University – Ramaz Khomeriki

The ultimate goal of the project was an investigatin of amplification possibility of optical signals in combined metal-dielectric subwavelength waveguides in case of side illumination of the waveguide. Under such condition it is possible to introduce a nontrivial boundary condition inducing signal amplification in the carrying waveguide. Thus by implementation of this project it has been made possible to suggest all optical transistor and diode devices based solely on linear effects. Schematic presentation of such a setup is presented in the figure below.

According to project manager information, it is shown that negative refraction effect could be realized for solitonic waves in nonlinear periodic dielectrics. By this it is possible to achieve aberration free focusing under realistic experimental conditions.

Project Results: The main achievement of the project is a suggestion of all optical linear amplification mechanism. Besides that the results could be generalized for completely different physical contexts, particularly, photonic amplification scheme is similar to “atomic chip” development studies, since light propagation in photonic crystals has a same mechanism as a dynamics of cold atoms in optical lattices. In the figures below we present the simulations of analogous amplification of optical signals in photonic crystals. The results obtained under the funding has been reported at international conferences and published in high impact factor journals:

 

 

1. All-optical amplification in metallic subwavelength linear waveguides 2013, Phys. Rev. A, 87, 053806 APS Ramaz Khomeriki, Jérôme Leon
2. Dynamics of Localized Modes in a Composite Multiferroic Chain 2013, Phys. Rev. Lett. 111, 117202 APS L. Chotorlishvili, R. Khomeriki, A. Sukhov, S. Ruffo, J. Berakdar
3. Dipolar needles in the microcanonical ensemble: Evidence of spontaneous magnetization and ergodicity breaking 2013, Europhys. Lett., 104, 17011 EPS G. Miloshevich, Th. Dauxois, R. Khomeriki, S. Ruffo
4. Creation and amplification of electromagnon solitons by electric field in nanostructured multiferroics 2015, Phys. Rev. B. 91, 041408(R) APS R. Khomeriki, L. Chotorlishvili, B. Malomed, J. Berakdar
5. Landau–Zener tunneling in multiferroic composites 2015, New Journal of Physics, 17, 013030 APS R. Khomeriki, L. Chotorlishvili, J. Berakdar
6. Linear Amplification of Optical Signal in Coupled Photonic Crystal Waveguides 2015, Photonics Technology Letters, IEEE, 27, 639 IEEE V. Jandieri, R. Khomeriki
7. Instabilities and relaxation to equilibrium in long-range oscillator chains 2015, Phys. Rev. E 91, 032927 APS G. Miloshevich, J.P. Nguenang, Th. Dauxois, R. Khomeriki, S. Ruffo