Orthogonal Standing-wave Lasers Research Articles

Localizing an atom using electromagnetically induced transparency in three dimensions

A new scheme for three-dimensional (3D) atom localization is proposed, in which the atomic system is driven by three orthogonal standing-wave lasers. Because of the space-dependent atom–field interaction, the position probability distribution of the atom can be directly determined by measuring the probe absorption. It is found that, by properly varying the parameters of the system, the probability of finding the atom in 3D space can be almost 100%. Our scheme opens a promising way to achieve high-precision and high-efficiency 3D atom localization, which provides some potential applications in laser cooling or atom nano-lithography via atom localization.

Coherent Control of Two-Dimensional Optical Absorption in a Quantum Dot Nanostructure

We investigate the two-dimensional (2D) optical absorption spectrum in a semiconductor quantum dot nanostructure driven by two orthogonal standing-wave lasers. It is found that, due to the position-dependent quantum interference effect, the 2D optical absorption spectrum can be easily controlled via adjusting the system parameters. Thus, our scheme may provide some technological applications in solid-state optoelectronics.

Two-dimensional probe absorption spectrum in a semiconductor quantum well

We investigate the two-dimensional (2D) probe absorption spectrum in a semiconductor quantum well driven by two orthogonal standing-wave lasers. It is found that, due to the position-dependent quantum interference, the 2D spatial distribution of probe absorption spectrum can be easily controlled via adjusting the system parameters. Thus, our scheme shows the underlying probability for the applications in solid-state optic communication and transmission.

Phase control of two-dimensional probe gain-absorption spectra in semiconductor quantum wells

We investigate the two-dimensional gain and absorption of a weak probe field via two orthogonal standing-wave lasers in a four-level inverted-Y asymmetric quantum well system. We find that, due to the spatial-dependent quantum interference effect, the spatial distribution of the 2D gain and absorption spectra can be easily controlled by adjusting the system parameters. More importantly, the probe gain-absorption spectrum can be controlled at a particular position and the 2D localization effect is indeed achieved efficiently. Thus, our scheme shows the underlying probability for the formation of the 2D localization effect by using a QW structure.

Two-dimensional localization effect via spatial-dependent quantum interference in an asymmetric double quantum dot nanostructure

We investigate the two-dimensional (2D) population distribution in a semiconductor quantum dot nanostructure driven by two orthogonal standing-wave lasers. It is found that, due to the position-dependent quantum interference effect, the 2D spatial population distribution of two upper states can be easily controlled via adjusting the system parameters. Thus, our scheme shows the underlying probability for the formation of the 2D localization effect in a solid.

Electron localization in an asymmetric double quantum well nanostructure

The localization behavior of an asymmetric coupled quantum well (CQW) driven by two orthogonal standing-wave lasers based on intersubband transitions is investigated. We have shown that the precision of localization of the electron depends on different controlling parameters in the medium. We find that the high-spatial- resolution and high-precision-localization of the electron can be achieved through proper adjustment of the standing-wave fields. This scheme manifests a high controllability for the formation of the electron localization through different parameters such as frequency detuning and intensity of fields and level splitting energy between the bonding and anti-bonding states.

2D probe absorption via spatial-dependent quantum interference in a triple semiconductor quantum well

We investigate the two-dimensional (2D) probe absorption spectrum in a triple semiconductor quantum well system driven by two orthogonal standing-wave lasers. It is found that, due to the quantum interference effect of interacting dark resonances, the 2D spatial distribution of probe absorption spectrum can be easily controlled via adjusting the system parameters. Thus, our scheme shows the underlying probability for the formation of the 2D localization effect in a solid.

Probe absorption via two orthogonal standing-wave lasers in a semiconductor quantum well

We investigate the two-dimensional (2D) probe absorption spectrum in a four-subband semiconductor quantum-well system driven by two orthogonal standing-wave lasers. It is found that the spatial distribution of 2D probe absorption spectrum can be significantly improved via adjusting the system parameters. The scheme shows the underlying probability for the formation of the 2D electron localization in a solid.

Coherent control of two-dimensional probe absorption in semiconductor quantum wells

We investigate the two-dimensional (2D) probe absorption spectrum in a four-subband three-coupled semiconductor quantum-well system driven by two orthogonal standing-wave lasers. It is found that, due to the quantum interference effect, the 2D spatial distribution of probe absorption spectrum can be easily controlled via adjusting the system parameters. Thus, our scheme shows the underlying probability for the formation of the 2D electron localization in a solid.

Coherent control of position-dependent probe absorption spectrum in a solid

We investigate the two-dimensional (2D) probe absorption spectrum in a four-subband coupled double quantum-well system driven by two orthogonal standing-wave lasers. It is found that, due to the quantum interference effect of interacting dark resonances, the 2D spatial distribution of probe absorption spectrum can be easily controlled via adjusting the system parameters. Thus, our scheme shows the underlying probability for the formation of the 2D electron localization in a solid.

Two-dimensional atom localization via controlled spontaneous emission from a driven tripod system

A scheme for two-dimensional (2D) subwavelength atom localization is proposed, in which the atom is in a four-level tripod configuration and driven by two orthogonal standing-wave lasers. Because of the spatial dependence of atom-field interaction, the spontaneously emitted photon carries information about the position of the atom in standing-wave fields. We exploit this fact to 2D atom localization conditioned on the measurement of spontaneously emitted photon at a particular frequency, and obtain a high precision and resolution in the position probability distribution. Moreover, an improvement by a factor of 2 in the detecting probability of an atom can be achieved by initially preparing the atom in the coherent population trapping state. Qualitatively, the high-precision, high-resolution atom localization can be attributed to the quantum interference effect between competitive multiple spontaneous decay channels.

Two-dimensional atom localization via quantum interference in a coherently driven inverted-Y system

A scheme for two-dimensional (2D) subwavelength atom localization is proposed, in which the atom is in an inverted-Y configuration and driven by two orthogonal standing-wave lasers. Due to the spatial dependence of atom–field interaction, the quantities of system, including the frequency of spontaneously emitted photon, the population in the excited state, and the probe absorption, carry information about the position of atom in standing-wave fields. We exploit this fact to 2D atom localization, and obtain a high precision and resolution in the position probability distribution.