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Journal of the Optical Society of America B

Observation of triple-dressing on photonic band gap of optically driven hot atoms

Dan Zhang, Zhiguo Wang, Mengqin Gao, Zakir Ullah, Yiqi Zhang, Haixia Chen, Yanpeng Zhang

Published Aug 20, 2015• 3 citations
Publisher

Abstract

We experimentally investigate transmission of the probe field, the reflected four-wave mixing photonic band gap signal, and fluorescence signal in a five-level atomic system. In addition, we compared the single-dressing, double-dressing, and triple-dressing on the three types of signals. These three types of signals can be controlled by frequency detunings, powers, and relative phases of the dressing beams. Such a scheme could have potential applications in amplification processing of triode and quantum information processing.

DOI
10.1364/josab.32.001961

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We experimentally investigate transmission of the probe field, the reflected four-wave mixing photonic band gap signal, and fluorescence signal in a five-level atomic system. In addition, we compared the single-dressing, double-dressing, and triple-dressing on the three types of signals. These three types of signals can be controlled by frequency detunings, powers, and relative phases of the dressing beams. Such a scheme could have potential applications in amplification processing of triode and quantum information processing.
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For the first time, we experimentally and theoretically research about the probe transmission signal (PTS), the reflected four wave mixing band gap signal(FWM BGS) and fluorescence signal (FLS) under the double dressing effect in an inverted Y-type four level system. FWM BGS results from photonic band gap structure. We demonstrate that the characteristics of PTS, FWM BGS and FLS can be controlled by power, phase and the frequency detuning of the dressing beams. It is observed in our experiment that FWM BGS switches from suppression to enhancement, corresponding to the switch from transmission enhancement to absorption enhancement in the PTS with changing the relative phase. We also observe the relation among the three signals, which satisfy the law of conservation of energy. Such scheme could have potential applications in optical diodes, amplifiers and quantum information processing.
Abstract For the first time, we have experimentally and theoretically researched the double dressing effect on the six wave mixing photonic band gap signal (SWM BGS), probe transmission signal (PTS) and fluorescence signal (FLS) in an inverted Y-type four level atomic system. We investigate the characteristics of the SMW BGS, PTS and FLS, which can be controlled by beam, power and detuning. At the same time, the relative phase which is caused by the incident angle of dressing beams plays a vital role in modulating the intensity of the SWM BGS, PTS and FLS. Such a scheme has potential applications in optical diodes, amplifiers and quantum information processing.
We investigate the spatial images of the probe, generated four wave mixing (FWM) signal and the accompanying fluorescence spectrum signal simultaneously in FWM process in a cascade three-level atomic system for the first time. We experimentally observe and theoretically investigate the three spectrum signals versus the probe field as well as the dressing field frequency detunings. Utilizing the experimental results of spectrum signals, the cross phase modulation and the relative position between the weak and strong beams, we analyze the characteristics indicated in the spatial images of probe transmission and FWM, such as focusing or defocusing, shift and splitting in detail. Such studies can be used in all-optical controlled spatial signal transmission.
We experimentally demonstrate dressed multi-wave mixing (MWM) and the reflection of the probe beam due to electromagnetically induced absorption (EIA) grating can coexist in a five-level atomic ensemble. The reflection is derived from the photonic band gap (PBG) of EIA grating, which is much broader than the PBG of EIT grating. Therefore, EIA-type PBG can reflect more energy from probe than EIT-type PBG does, which can effectively affect the MWM signal. The EIA-type as well as EIT-type PBG can be controlled by multiple parameters including the frequency detunings, propagation angles and powers of the involved light fields. Also, the EIA-type PBG by considering both the linear and third-order nonlinear refractive indices is also investigated. The theoretical analysis agrees well with the experimental results. This investigation has potential applications in all-optical communication and information processing.
Three and four electromagnetically induced transparency windows generate the multi-channel four-wave mixing (FWM) process are observed in a four-level atomic system. The transmission of the probe field and the reflection of the FWM are investigated in the modulated moving photonic band gap structures which are caused by the coupling fields with a relative small detuning offset when scanning detuning frequency of the probe field and the dressing field, respectively. The experimental results show that the more channels spectrum signal of the FWM process can be modulated and the generated multi-channel can be further modulated by adding a dressing field. We have also explained theoretically these experimental results which may have applications in the design of photonic crystal and optical signal amplifiers.