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Plasmonics

Observation of Optical Bistability in a Polaritonic Material Doped with Nanoparticles

Ghahraman Solookinejad, M. Panahi, Elnaz Ahmadi Sangachin, Seyyed Hossein Asadpour

Published Dec 15, 2016• 16 citations
Publisher
DOI
10.1007/s11468-016-0458-0

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We investigate the optical bistability and multistability in polaritonic materials doped with nanoparticles inside an optical ring cavity. It is found that the optical bistability and multistability can be easily controlled by adjusting the corresponding parameters of the system properly. The effect of the dipole–dipole interaction has also been included in the formulation, which leads to interesting phenomena. Our scheme opens up the possibility of controling the optical bistability and multistability in polaritonic materials doped with nanoparticles.
A theory of nonlinear two-photon absorption has been developed for a polaritonic band-gap material doped with an ensemble of three-level nanoparticles. We have considered that the nanoparticles are interacting with the polaritonic material. An expression of two-photon absorption has been obtained by using the density-matrix method. The effect of the dipole-dipole interaction (DDI) has also been included in the formulation, which leads to interesting phenomena. For example, it has been found that the two-photon absorption can be turned on and off when the decay resonance energy of the three-level nanoparticles is moved within the lower-energy band. It has also been found that the inhibition effect can also be achieved by controlling the strength of the DDI.
Abstract In this paper, the group velocity of transmitted and reflected pulses through a defect dielectric medium doped with polaritonic materials and nanoparticles is explored by using the density matrix equations and transform matrix method. It is demonstrated that the group velocity of transmitted and reflected lights can be manipulated by adjusting the system’s parameters. The effect of the dipole–dipole interaction is also discussed on behaviors of transmitted and reflected pulses through the slab. Our proposed model may be opened up the possibility of new storage and switching devices based on polaritonic material nanoparticles in future commercial systems.