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Laser Physics

Optical multistability in 1D photonic crystal doped with carbon-nanotube quantum dot nanostructures

Ghahraman Solookinejad, Mohammad Payravi, Masoud Jabbari, Mehdi Nafar, Elnaz Ahmadi Sangachin

Published Nov 22, 2017• 4 citations
Publisher

Abstract

Abstract The optical bistability (OB) and multistability (OM) in one-dimensional photonic crystals doped with carbon-nanotube quantum dots (CNT QDs) is theoretically investigated. Our investigations show that due to spin–orbit coupling in CNT QDs the threshold of optical bistability can be adjusted. Also, the switching from OB to OM, or vice versa, can be achieved by controlling the transverse magnetic field. Our proposed model can be used as a suitable structure based on CNT QDs for realizing all-optical switching devices. Moreover, we realize that the controlling of OB and OM can be done without changing the thickness of the layers.

DOI
10.1088/1555-6611/aa9142

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We theoretically investigate steady-state behaviors of carbon nanotube quantum dots with spin-orbit coupling in a unidirectional ring cavity. Our results show that the spin-orbit coupling can induce optical bistability. In addition to the existence of spin-orbit coupling, switching optical bistability to optical multistability or vice versa is realized by adjusting detuning of the probe field. Our results show that the carbon nanotube quantum dots will possibly be a promising candidate for realizing all-optical switching.
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Abstract In this letter, we proposed a brand-new version for investigating the optical bistability (OB) and optical multistability (OM) through electron tunneling impact in a defect one-dimensional photonic crystal (1DPC). The defect layer of 1DPC is doped with double quantum dot (DQD) nanostructure which interacts with an indirect incoherent pump and a susceptible probe incident light, respectively. By the usage of the quantum mechanical density matrix method, we first examine the refractive index properties of the defect layer through electron tunneling and indirect incoherent pumping effects. Then, through the usage of the transfer matrix methods, we acquire the reflection and transmission coefficients of the defect 1DPC. At the end, we discuss the OB and OM properties of the reflected and transmitted lighting in negative refractive index situation of the DQD. We determine that during a few parametric conditions the switching from OB to OM or vice versa is feasible for reflected and transmitted light beams.
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In this paper, we proposed a new model based on the electron tunneling effect in a four-level quantum dot molecule (QDM) for studying the optical bistability (OB) and optical multistability (OM). The QDM interacts with a probe and two coupling and Laguerre–Gaussian (LG) fields. We found that by adjusting the electron tunneling effect and the parametric controlling of LG light, the transition from OB to OM or vice versa is possible. Moreover, due to the simultaneous interaction between coupling and LG lights with the same optical transition adjusting the threshold of OB and OM by orbital angular momentum (OAM) of the LG light becomes achievable. Our results show that by adjusting the simultaneous effect of electron tunneling and OAM state of the vortex light, the favorable OB and OM patterns with adjustable intensity thresholds are achievable. Our proposed model may have potential application in quantum information science based on quantum dot (QD) devices.