Exciton-polariton based WS₂ polarization modulator controlled by optical Stark beam

Abstract

The recent era of fast optical manipulation and optical devices owe a lot to exciton-polaritons being lighter in mass, faster in speed and stronger in nonlinearity due to hybrid light-matter characteristics. The room temperature existence of polaritons in two dimensional materials opens up new avenues to the design and analysis of all optical devices and has gained the researchers attention. Here, spin-selective optical Stark effect is introduced to form a waveguide effect in uniform community of polaritons, and is used to realize polarization modulation of polaritons. The proposed device basically takes advantage of the spin-sensitive properties of optical Stark effect of polaritons inside the WS 2 microcavity so as to guide different modes and modulate polarization of polaritons. It is shown that polaritonic wavepacket of different mode profiles can be generated by changing intensity of the optical Stark beam and the polarization of polaritons can be controlled and changed periodically along the formed waveguide by introduction birefringence that is sensitive to polarization degree of the optical Stark beam.

Entanglement generation by strong coupling between surface lattice resonance and exciton in an Al nanoarray-coated WS2 quantum emitter

“…Generally, if the two degenerate energy levels of SLR and exciton overlapping at the frequency spectrum, respectively, then a revisable pathway of energy exchanging between SLR and exciton exists, the states can beat over the two energy levels with an oscillating frequency of , and then, the final states are the oscillating states with oscillating frequencies of , which results in an energy level splitting of . In other words, an energy level splitting of forms [ 27 ].…”

Engineering van der Waals Materials for Advanced Metaphotonics

“…As we discussed in previous sections, a prominent PL effect is the key linear optical property of TMDCs . For semiconductor TMDCs, a feature worth noting would be their indirect band gap in bulk and few-layer structures and their direct band gap in monolayers.…”

“…As we discussed in previous sections, a prominent PL effect is the key linear optical property of TMDCs. 304 For semiconductor TMDCs, a feature worth noting would be their indirect band gap in bulk and few-layer structures and their direct band gap in monolayers. Because of this, PL emission efficiency was found to be significantly more prominent in monolayer TMDCs compared to that in the bulk states, as we mentioned in the layer stacking effects.…”