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Soviet Journal of Quantum Electronics

Switching of radiation in tunnel-coupled optical waveguides by weak radiation frequency

A. A. Maǐer

Published Jul 31, 1986• 8 citations
Publisher

Abstract

It is shown that abrupt and complete transfer of the power of strong (pump) radiation from the exit of one waveguide to the exit of another is possible as a result of a small change in the power of a weak (control) signal of different frequency applied to the entry of one of the waveguides.
DOI
10.1070/qe1986v016n07abeh007191

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It is shown that abrupt transfer of radiation power is possible from one frequency to another at the output of a medium with a quadratic nonlinearity when its input is subjected to a small signal at the doubled frequency and the intensity of the signal is altered slightly under phase-matched interaction conditions and also in the case of deviation from such conditions. It is shown that an optical transistor can be constructed on the basis of this effect and that a giant gain can be achieved for a weak alternating signal.
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The coherent population trapping eect in double tunnel-coupled quantum wells is analyzed.One of two quantum wells interacts with the two-frequency laser radiation and low-frequency eld, thus forming a closed contour of excitation.It is possible to control the excited level population in such a scheme of excitation by changing relative phases of the elds in the coherent population trapping state.The quantum well is bound to the other quantum well by tunnel coupling of the excited levels, therefore the population and optical properties of the other quantum well depend on the coherent population trapping state in the rst quantum well and can be controlled.
The propagation of a strong coherent "pump" wave traveling through a resonant medium is discussed. The medium is assumed to consist of identical stationary atoms, and the pump-wave frequency is assumed to coincide exactly with the resonance frequency for transitions between a particular pair of atomic states. A previously developed theory of the response of a strongly driven atom to a weak nearly resonant "signal" field is used to deduce the existence of a coupling between any two waves travelling parallel to the pump wave whose (nearly equal) frequencies sum to twice the pump-wave frequency. In the limit of very intense (highly saturating) pump fields, the coupling between the two waves of nearby frequencies leads to amplification of both waves if their frequencies lie within an interval about the pump-wave frequency equal to the Rabi frequency of population inversion. The basic process, which is roughly described by travelling-wave parametric-amplifier equations of motion, consists of the absorption of two pump-field photons followed by their emission at different nearby frequencies, and thus implies a frequency instability of the initially coherent pump wave.