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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

All-optical tunable mirror of VCSEL using electromagnetically induced transparency

Ali Rostami, Karim Abbasian, Pouria Sayyad Khodashenas, Farrokh Janabi‐Sharifi

Published Oct 6, 2008• 4 citations
Publisher

Abstract

A new and efficient proposal for all-optical tunable mirror of VCSEL using electromagnetically induced transparency (EIT) is proposed. For this purpose a slab doped with quantum dots for realization of 3-level atomic system is considered. Density matrix formulation for time evaluation of the proposed structure is used. The reflection and transmission coefficients of the considered slab are calculated and time development of the related amplitude and output power and threshold current density of VCSEL laser studied. We show that some nanometer tuning can be obtained. So, the proposed idea can open a new realization method of all-optical tunable VCSEL lasers.

DOI
10.1117/12.804473

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Acta Physica Sinica•Jan 1, 2004•2 citations
A new and efficient proposal for all-optical tunable mirror of VCSEL using electromagnetically induced transparency (EIT) is proposed. For this purpose a slab doped with quantum dots for realization of 3-level atomic system is considered. Density matrix formulation for time evaluation of the proposed structure is used. The reflection and transmission coefficients of the considered slab are calculated and time development of the related amplitude and output power and threshold current density of VCSEL laser studied. We show that some nanometer tuning can be obtained. So, the proposed idea can open a new realization method of all-optical tunable VCSEL lasers.
A new and efficient proposal for all-optical tunable devices and systems using electromagnetically induced transparency (EIT) is proposed. For this purpose a slab doped with quantum dots for realization of three-level atomic system is considered. Density matrix formulation for evaluation of the proposed structure is used. The reflection and transmission coefficients of the considered slab are calculated and the related amplitude and phase quantities studied versus parameters of the structure. We show that some nanometer tuning with application of the control field is obtained. So, the proposed idea can open a new realization method of all-optical tunable devices and systems towards all-optical systems.
In this paper, we have designed an all-optical controllable gas detector by doping 3-level Λ type nanocrystals in the moving arms' mirror of Michelson interferometer and used electromagnetically induced transparency (EIT) phenomenon to change its refractive index. By this means, we have created a controllable phase difference between light beams in two arms of the Michelson interferometer, where reflection phase of the EIT-based mirror changes about π radiant. Also, the signal reflection from EIT-based mirror changes between 0% and 100% approximately, while the second arm's signal is reflected completely. This EIT-based mirror's refractive index change can be a good alternative for conventional Michelson interferometer-based gas detector with one mechanical moving arm mirror (Undergraduate Instrumental Analysis, 6th edn. Marcel Dekker, New York, 2005), where long response time and unfix moving speed were its main drawbacks. While, in this scheme, not only these disadvantages are removed but also the response time can reach the electron transient time between the atomic energy levels. Then, by this all-optical tunable gas detector, we have achieved many modifications such as response time in sub-nanoseconds, high resolution, and high accuracy, or less cross sensitivity to other gas species.
For the cavity-based electromagnetically induced transparent (EIT), as the coherent driving field is enhanced by the optical cavity, the weak probe field can propagate through the atomic ensemble without absorption even if the driving field is weak. The extreme case of vacuum in the cavity is called "vacuum-induced transparency" (VIT) to distinguish it from the cavity EIT. Here we construct a new kind of cavity made of Metamaterials, i.e. ε-negative (EN) and μ-negative (MN) slabs, and study the VIT phenomena of the atomic ensemble doped within it. When the impedances of the MN and EN slabs are matched to each other and the dissipation of the material is small, it behaves as a surface plasmon cavity with a huge Q factor. And the VIT phenomenon in this cavity appears. By adjusting the position of atoms, the coupling strength between the atom and the structure could be changed. Two kinds of extremes of VIT, the coherent population trapping (CPT) and the Autler-Townes splitting (ATS), can be achieved in this system easily. Our proposal could be used in the realization of ultra-strong coupling and integrated devices on quantum memory or optical switch.
We suggest and analyze a new type of microscopic laser, which uses a highly dispersive mirror to achieve stable dual-mode lasing. The mirror-dispersion is implemented using electromagnetically induced transparency (EIT) between two coupled nanocavities and allows a beat note frequency that is dynamically tunable. In contrast, a conventional laser resonator of the same length cannot address this frequency range. Thus, the proposed laser has potential applications in photonic microwave generation, terahertz sensing, and all-optical clock recovery [1].
We propose a scheme for controlling coherent photon absorption by electromagnetically induced transparency (EIT) in a three-level atom-cavity system. Coherent perfect absorption (CPA) occurs when time-reversed symmetry of lasing process is obtained with the destructive interference at the cavity interfaces. The frequency range of CPA is generally dependent on the decay rates of the cavity mirrors. The smaller decay rate of the cavity mirror causes the wider frequency range of CPA, and the needed intensity of the probe fields is larger to satisfy CPA condition for a given frequency. Although Rabi frequency of the control laser has little effect on the frequency range of CPA, with EIT-type quantum interference, the CPA mode is tunable by the control laser. In addition, with the relative phase, the probe fields can be perfectly transmitted and/or reflected. Therefore, the system can be used as a controllable coherent perfect absorber or transmitter (reflector), and our work may have practical applications in optical logic devices.