Spectral Behaviour Of Single-Mode Directional Couplers With Strong Coupling

1990 ◽  
Author(s):  
Frank Schmidt
Keyword(s):  
Strong Coupling ◽  
Single Mode ◽  
Directional Couplers ◽  
Spectral Behaviour

scholarly journals Femtosecond Laser Written Depressed-Cladding Waveguide 2 × 2, 1 × 2 and 3 × 3 Directional Couplers in Tm3+:YAG Crystal

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 1 ◽  
Author(s):  
Nikolay Skryabin ◽  
Alexander Kalinkin ◽  
Ivan Dyakonov ◽  
Sergei Kulik
Keyword(s):  
Femtosecond Laser ◽  
Single Mode ◽  
Integrated Photonics ◽  
Beam Splitting ◽  
Directional Couplers ◽  
Laser Writing

Ion-doped crystal-based compact devices capable of beam splitting and coupling are enthralling for a broad range of classical and quantum integrated photonics applications. In this work, we report on the fabrication of depressed-cladding waveguide 2D 2 × 2, 1 × 2 and 3D 3 × 3 directional couplers in Tm 3 + :YAG crystal by femtosecond laser writing. The performances of the couplers are characterized at 810 nm, showing single-mode guidance, polarization independence, finely matched splitting ratios. These results open up new opportunities in the beneficial fabrication of 3D circuits and devices in crystals.

scholarly journals Double Rabi splitting in methylene blue dye-Ag nanocavity

Nanophotonics ◽  
2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Xiaobo Han ◽  
Fang Li ◽  
Zhicong He ◽  
Yahui Liu ◽  
Huatian Hu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Strong Coupling ◽  
Single Mode ◽  
Blue Dye ◽  
Strong Coupling Regime ◽  
Methylene Blue Dye ◽  
Dye Molecules ◽  
Rabi Splitting ◽  
Ag Nanocube ◽  
Multi Mode

Abstract We demonstrate a double Rabi splitting totaling 348 meV in an Ag nanocavity embedding of methylene blue (MB) dye layer, which is ascribed to the equilibrium state of monomer and dimer coexistence in MB dye. At low dye concentration, the single-mode strong coupling between the monomer exciton in MB dye and the Ag nanocavity is observed. As the dye concentration is increased, three hybridized plexciton states are observed, indicating a double Rabi splitting (178 and 170 meV). Furthermore, the double anti-crossing behavior of the three hybrid states is observed by tuning the Ag nanocube size, which validates the multi-mode strong coupling regime. It shows clear evidence on the diverse exciton forms of dye molecules, both of which can interact with plasmonic nanocavity, effectively. Therefore, it provides a good candidate for realizing the multi-mode strong coupling.

The su(1,1)-like intensity-dependent Rabi model: A perturbative analysis of weak and strong-coupling regimes

2014 ◽  
Vol 12 (07n08) ◽  
pp. 1560010 ◽  
Author(s):  
Vittorio Penna ◽  
Francesco A. Raffa
Keyword(s):  
Strong Coupling ◽  
Photon Number ◽  
Single Mode ◽  
Strong Coupling Regime ◽  
Model Parameters ◽  
Energy Eigenvalues ◽  
First Case ◽  
Coupling Case ◽  
Rabi Model ◽  
Almost Continuous

We present a perturbative analysis of a Rabi model where the coupling between the quantized single-mode electromagnetic field and the two-level atom depends on the field intensity. Upon modeling the matter–radiation coupling through the Holstein–Primakoff realization of algebra su(1,1), we evaluate first- and second-order eigenenergies and eigenstates both in the weak-coupling regime (atom transition frequency smaller than the coupling strength) and in the strong-coupling regime. In the first case, among various effects, we observe a quadratic dependence on the photon number of energy eigenvalues and the possible formation of level doublets. In the strong-coupling case, the perturbative analysis becomes considerably complex due to the su(1,1)-valued form of the unperturbed Hamiltonian. The critical condition for the transition to an almost continuous spectrum is found in terms of the model parameters.

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