Abstract
We develop a theory of original quantum mechanism for finding strong optical activity quantum optical system in three-level non-chiral nanostructures, where symmetrical incidence (the propagation of the incident light is vertical to the plane of nanostructures) is considered. The theory is validated via both analytical and numerical analysis of specifically designed non-chiral coupled quantum dots models. In particular, by proper designing of the incidence, tunable terahertz wave polarized even in the opposite direction of the incidence is obtained. The effect could be explored for developing novel highly efficient terahertz polarization rotator and modulators, and may lead to the appearance of a new class of negative index terahertz nanostructures.
Highlights
We develop a theory of original quantum mechanism for finding strong optical activity quantum optical system in three-level non-chiral nanostructures, where symmetrical incidence is considered
Enhanced and broadband optical activity were demonstrated in multiferroic borates,[14] inter-molecular coupling of planar chiral metamaterial,[15] and meshed helical metamaterials.[16]
Pro.Zheludev and his co-worker showed that extrinsic chirality can lead to exceptionally large optical activity in microwave and photonic planar metamaterials,[19,20,21] and terahertz (THz) region.[22,23]. They argued that to manifest optical activity, a planar non-chiral metamaterial may have a line of mirror symmetry, but shall lack an inversion center, and the chirality effects of this system derive from symmetry breaking of optical wave vector under oblique incidence
Summary
We develop a theory of original quantum mechanism for finding strong optical activity quantum optical system in three-level non-chiral nanostructures, where symmetrical incidence (the propagation of the incident light is vertical to the plane of nanostructures) is considered. A theory of original quantum mechanism is developed for composing specific symmetrical three-level non-chiral quantum optical system of strong optical activity. The nonlinear optical behavior of photon emission in this system presents sensitive optical activity Both analytical and numerical calculations of polarization states of high order harmonic (HH) and hyper-Raman (HR) radiations in our system well matches the prediction of the proposed theory. 1, 2, 3..., such that the initial state and Hamiltonian are invariant, and the dipole operator Phas certain phase shift θ, the emission spectrum has determinate optical rotation pattern. Eq (2) is invariant (up to phase shift θ), which means spatial transformation
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