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IEEE International Conference on Photonics

Proposal for all-optical controllable double state switch using dipole induced transparency (DIT)

Karim Abbasian, K. Eftekhari, Ali Rostami, Saeed Golmohammadi

Published Jul 1, 2010• 0 citations
Publisher

Abstract

In this work, we propose an all-optical controllable double state switch using the dipole induced transparency effect applied on multilevel nanocrystal doped to photonic crystal (PC) cavity. Using the proposed structure, with applying one control field the absorbing medium converted to transparent one and switching operation is obtained and then applying the second control field changes the transparent PC cavity to opaque one again. Analytical relation for the proposed switch is presented and studied by investigation of effects of parameters on switching characteristics.

DOI
10.1109/icp.2010.5604401

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In this work, we propose an all-optical controllable double state switch using the dipole induced transparency effect applied on multilevel nanocrystal doped to photonic crystal (PC) cavity. Using the proposed structure, with applying one control field the absorbing medium converted to transparent one and switching operation is obtained and then applying the second control field changes the transparent PC cavity to opaque one again. Analytical relation for the proposed switch is presented and studied by investigation of effects of parameters on switching characteristics.
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We propose a new control structure for all-optical switching in multimode inference (MMI)-based Mach–Zehnder interferometer (MZI) devices. This structure is composed of an MZI doped by three-level nanocrystals for the realization of electromagnetically induced transparency (EIT) in the lower arm. We use two different intensities of control field for two states of the proposed switch. Using a control field in both of the two switching states is necessary, where the EIT region is transparent. By changing the intensity of the control field, the refractive index of the doped region changes, which makes the phase difference between the two arms of the MZI. Hence, the switching operation takes place. Simulation results show that the extinction ratio of the device is −32dB in the worst case.
Quantum optics of metallic photonic crystals is studied in this paper. Crystals are made from metallic spheres and a background dielectric material. The refractive index of the metallic spheres depends on the frequencies of the incident light and plasmons whereas the refractive index of the background material is a constant. Crystals are lightly doped with four-level nanoparticles. It is considered that nanoparticles are interacting with the metallic crystals via electron-photon interaction in the dipole approximation. The probe and pump laser fields are applied to monitor the absorption spectrum in the system. Two transparent states are predicted. One is due to the electromagnetically induced transparency and the other is due to the electron-photon interaction. For certain experimental conditions these transparent states merge into one transparent state. The effect of plasmon frequencies has also been studied. It is found that the system can be switched from a transparent state to an absorbing state just by changing the frequency of plasmons. This study can be used to makes new types of optical devices such as switches and optical transistors.
Abstract We provide an approach to realize an optical switch using an induced transparency phenomenon in double-cavity structures. Our system consists of two directly coupled cavities, each coupled to a different waveguide. The system is pumped by a control field and a signal field propagating in the waveguides. We analyze the excitation spectra of the cavities, as well as corresponding transmission and reflection coefficients for the signal field. We find that induced transparency or an absorption phenomenon for the signal field can be established in this system, depending on the parameters of the control field. Thus, the transport properties for the signal field are highly controllable. Under appropriate parameters the system can behave as a nearly perfect optical switch for the signal field. The influence of dissipations on the efficiency of the switch is also discussed. The device studied here is suitable for on-chip integrations, and may have broad applications in future quantum networks.
We analyze the behaviour of a quantum dot embedded in a photonic crystal add-drop filter and in a direct coupled photonic crystal microcavity for optical signal processing applications. The joint effect of dipole induced transparency and electromagnetic induced transparency, considering a cascade configuration of the quantum dot, are used to modify the behaviour of the whole system. The mathematical model and a number of different conditions for tuning the frequency response of the filters are derived for application in all-optical switching and wavelength tunable devices.