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Optical Fiber Communication Conference

A optical switch with quantum interference in intersubband transitions

Xuemei Su, Zhongchang Zhuo, Jin-Yue Gao, Yumei Liu

Published Jun 13, 2001• 0 citations
OpenAlex

Abstract

We propose a scheme for a weak optical switch in Semiconductor double quantum well structure by quantum interference in intersubband transitions. It is much more practical than the atomic system for its flexible design and the contollable interference strength.

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We propose a new scheme for lasing without population inversion that utilizes interferences in double-quantum-well intersubband transitions. In contrast to the previous inversionless laser schemes based on atomic systems, the new proposal permits us to use band-gap engineering to choose the subband energies, coupling strengths, and decay rates, as desired, and permits us to create a laser system that does not require population inversion. We present detailed calculations on a specific scheme and discuss possible extensions.
In multiple quantum wells system, a large dipole strength and a narrow band width were observed. This suggests that the intersubband optical transitions in a quantum well may have very large optical nonlinearities. The intersubband transition have potential for device applications in far-infrared laser amplifiers, photodetectors and high-speed electrooptical modulators. In device design, the region of input optical density for linear response is a very important parameter. And the optical saturation is related with tunnelling effects and the intersubband relaxations. So the intersubband nonlinear absorption is very valuble for a fundamental and a practical point of views. Recently, there are some works on this region [1], [2].
We investigate optical bistability in intersubband transitions of an asymmetric semiconductor quantum well structure that has equidistant transitions between three subbands of the system and is placed in a unidirectional cavity. The system is simultaneously coupled by a fundamental field and its second harmonic. The second harmonic field acts as a control field and significantly influences the optical bistability. In addition, the two-color coherent control of optical bistability by the relative phase of the fundamental and the second harmonic fields is shown. The influence of the electronic cooperation parameter on the OB behavior is also discussed. This investigation may be used for optimizing and controlling the optical switching process in the SQW solid-state system, which is much more practical than that in the atomic system because of its flexible design and the controllable interference strength.
Summary form only given. Several characteristic features have attracted the current interest in nonlinear optical phenomena of quantum well-intersubband transitions (QWISBTs): the ability to design the quantum well structure and hence control the transition energies and optical dipole matrix elements; the almost equal effective masses of the subbands leading to virtually discrete optical transitions; and the weak localization of electrons in the conduction band leading to large optical dipole matrix elements and hence strong optical interactions.
An experimentally feasible scheme of a four-level atomic system driven by two microwaves and one optical field is suggested in order to realize destructive and constructive quantum interference between the two microwave-driven transition pathways and hence to coherently manipulate the applied optical field. The destructive quantum interference can be switched to the constructive interference and vice versa if one tunes the intensity ratio of the two microwaves. Such an effect of tunable optical response based on microwave quantum interference may have some potential applications to the technique for designing new photonic and quantum optical devices, e.g., photonic logic gates, optical switches, and photonic transistors.