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1.
Xiantong Yu Yufeng Yuan Jianhua Xu Ken‐Tye Yong Junle Qu Jun Song 《Laser u0026amp; Photonics Reviews》2019,13(1)
When interaction between light and matter is in the strong coupling region, matter has a significant influence on the whole system, with potential to develop low‐power active optical devices. Strong coupling can verify some basic problems of quantum physics, and it is an ideal system to study light–matter interaction, providing an intuitive and accurate demonstration of some pure quantum effects with small mass and easy optical control. Here, the most important advances in strong coupling in recent years are described. Of late, an extensive series of experimental and theoretical findings, and remarkable achievements have been made in this field. Strong coupling between cavities and some new materials such as semiconductors, two‐dimensional (2D) material, and quantum dots (QDs) are the focus of research in this field. Another field that has made outstanding progress is the application of this optical phenomenon, including resonance‐enhanced Raman and infrared spectra, nanolasers, and cavity‐enhanced sensing. Furthermore, the potential in this field arises for future quantum information and quantum optical devices. It is now developing at a very fast rate and can be predicted to have broad prospects for development in the future. Some prospects in terms of design and application are included. 相似文献
2.
Aniket Patra Vincenzo Caligiuri Roman Krahne Antonio De Luca 《Advanced Optical Materials》2021,9(24):2101076
Strong light–matter interaction is usually achieved by embedding a gain medium in a high-quality (Q)-factor cavity made with thick external mirrors. The high reflectivity of the mirrors poses, therefore, a trade-off between pump radiation coupling efficiency and high Q-factor, thus preventing the use of optical cavities in photonic contexts where the photosensitive element necessitates to be readily accessible. Here, this long-standing problem is overcome by engineering “Pseudo-Cavity Modes” (PCM) in a Metal/Dielectric Open Cavity (MDOC) system that has been commonly thought to be incapable to show resonances. The MDOC system lets the embedded fluorophore exposed to radiation, opening to strong light/matter interaction. To prove this: i) exciton/PCM strong coupling regime, with 160 meV Rabi splitting, ii) photoluminescence enhancement by more than 7 times, and iii) polarized and angle-dependent spontaneous emission are experimentally and theoretically demonstrated. The proposed system holds great potential envisioning scenarios like cavity-enhanced photovoltaics, surface-enhanced Raman scattering, open-cavity lasers, photoluminescence steering and polarization. 相似文献
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光参量过程中的逆转换问题 总被引：1，自引：0，他引：1
逆转换是影响光参量变换转换效率、参量光光束质量以及参量光输出稳定性的关键因素,随光斑分布和时间变化,逆转换现象很难消除.文中分析了光参量变换过程中的逆转换问题,研究了影响逆转换的关键因素.分析得出,适当的晶体长度、优化的抽运光斑截面类型、合适的谐振腔参数(对于振荡器)有利于降低逆转换,提高参量转换效率,改善参量光光束质量.根据理论分析结果,设计了脉冲砷酸钛氧钾(KTA)光参量振荡器,实验获得了270 mJ信号光和150 mJ闲频光输出,有效地抑制了逆转换的影响,参量转化效率达到了43%.关键词：逆转换光参量放大光参量振荡 相似文献
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Summary A new high-powered ultraviolet laser system is proposed. The system doubles the infrared light from a Nd-Yag laser mode-locked
at 100 MHz, injects this light into a storage-ring cavity to accumulate a high power in the visible and then doubles this
into the ultraviolet at 2600 ?. The power levels anticipated at this wavelength are much larger than those of commercially
available c.w. lasers. The new system can have a far-reaching impact in basic research and, even more so, in a great many
industrial applications. 相似文献
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Songyan Hou Landobasa Y. M. Tobing Xingli Wang Zhenwei Xie Junhong Yu Jin Zhou Daohua Zhang Cuong Dang Philippe Coquet Beng Kang Tay Muhammad Danang Birowosuto Edwin Hang Tong Teo Hong Wang 《Advanced Optical Materials》2019,7(22)
Strong interactions between surface plasmons in ultracompact nanocavities and excitons in 2D materials have attracted wide interests for its prospective realization of polariton devices at room temperature. Here, a continuous transition from weak coupling to strong coupling between excitons in molybdenum disulfide (MoS2) monolayer and highly localized plasmons in ultracompact nanoantenna is proposed. The nanoantenna is assembled by a silver nanocube positioned over a gold film and separated by a dielectric spacer layer. A 1570‐fold enhancement in the photoluminescence is observed at weak coupling regime in hybrid nanocavities with thick spacer layers. The interaction between excitons and plasmons is then directly prompted to strong coupling regime by shrinking down the thickness of spacer layer. Room temperature formation of polaritons with Rabi splitting up to 190 meV is observed with a fair polariton loss around 165 meV. Numerical calculations quantify the relation between coupling strength, local density of states, and spacer thickness, and reveal the transition between weak coupling and strong coupling in nanocavities. The findings in this work offer a guideline for feasible designs of plasmon–exciton interaction systems with gap plasmonic cavities. 相似文献
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The entanglement of two qubits is investigated in the range of their ultra-strongly coupling with a quantum oscillator. The two qubits are initially in four Bell states and they are under the control mechanism of the coherent state of the quantum oscillator. There are four parameters: the average number of the coherent state, the ultra-strong coupling strength, the ratio of two frequencies of qubit and oscillator, and the inter-interaction coupling of the two qubits in the mechanism, and they all are influential parameters on the entanglement of the two qubits. One Bell state |0>is easyily kept and is trivial case. The novel results show that there is one state |I0> among the other three Bell states which the entanglement of the two qubits could be almost completely preserved. The possibility is made into reality by the appropriate choice of the four influential parameters. We give two different schemes to choose the respective parameters to maintain the entanglment of |I0> almost undiminished. The results will be useful for the quantum information process. 相似文献
7.
用场方法研究了相对论速调管振荡器中两个调制腔的耦合,解析地得到了两腔耦合系数与腔和波导的尺寸、间隙及两腔之间的距离等参数之间的关系。耦合系数的数值与由耦合与否腔的频率测量确定的实验结果在数量级上符合得较好。 相似文献
8.
Kishan S. Menghrajani Henry A. Fernandez Geoffrey R. Nash William L. Barnes 《Advanced Optical Materials》2019,7(18)
Strong coupling of molecules placed in an optical microcavity may lead to the formation of hybrid states called polaritons, states that inherit characteristics of both the optical cavity modes and the molecular resonance. This is possible for both excitonic and vibrational molecular resonances. Previous work has shown that strong coupling may be used to hybridize two different excitonic resonances; this can be achieved when more than one molecular species is included in the cavity. Here it is shown that under suitable conditions three different molecular vibrational resonances of the same molecular unit may also be coupled together, the resulting polariton having characteristics of all three vibrational resonances. These results suggest that strong coupling might be used to manipulate vibrational resonances in a richer and subtler way than previously considered, opening a path to greater control of molecular systems and molecular processes via vibrational strong coupling. 相似文献
9.
We investigate continuous variable entanglement produced in two distant coupled cavities, in which two four-level atoms are driven by classical fields respectively. Under the large detuning condition, an effective Hamiltonian containing the square of the creation (annihilation) operator of the cavity field is derived. Due to the nonlinearity, entanglement formally created by the beam splitter type interaction is transformed into the nondegenerate parametric down conversion type. Employing the operator algebraic method, we study the time evolution of the entanglement condition, and show that the system provides us an advantage in achieving a larger photon number with better entanglement. We also discuss the dissipation of the cavities affecting the entanglement. 相似文献
10.
J.M. Villas-Bas Sergio E. Ulloa Alexander O. Govorov 《Physica E: Low-dimensional Systems and Nanostructures》2005,26(1-4):337
In this letter, we develop a model to describe the Rabi oscillations observed in a quantum-dot photodiode. Using a multi-level density matrix formulation, which includes multi-exciton and single particle states, we show that the damping observed in recent experiments is the result of a non-resonant excitation from or to the continuum of the wetting layer states. 相似文献
11.
《Advanced Optical Materials》2017,5(8)
A multimode coherent hybrid system formed by strongly coupled surface plasmons in gold nanohole arrays and excitons in sulforhodamine 101 dyes is investigated by using both a steady‐state spectroscopic method and a femtosecond transient absorption spectra approach. A double Rabi splitting up to 255 meV and 188 meV is observed in steady‐state transmission measurements. Furthermore, the dynamics of the multimode coherent hybrid system are studied under upper band resonant excitation. It is found that the bleaching signal associated with uncoupled sulforhodamine 101 molecules completely disappears. Instead, two distinctive bleaching signals corresponding to the middle and lower bands are formed, thus highlighting the presence of coherent hybrid states. Finally, a remarkebly long lifetime for the lower band is observed, even longer than the bleaching recovery of the uncoupled dyes, in perfect agreement with the non‐Markovian regime. These peculiar features can provide new perspectives for coherent energy transfer and mode‐selective chemistry, thus enriching the tools available in the chemical reaction landscape. 相似文献
12.
Cavity optomechanics represents a flexible platform for the implementation of quantum technologies, useful in particular for the realization of quantum interfaces, quantum sensors and quantum information processing. However, the dispersive, radiation–pressure interaction between the mechanical and the electromagnetic modes is typically very weak, harnessing up to now the demonstration of interesting nonlinear dynamics and quantum control at the single photon level. It has already been shown both theoretically and experimentally that if the interaction is mediated by a Josephson circuit, one can have an effective dynamics corresponding to a huge enhancement of the single-photon optomechanical coupling. Here we analyze in detail this phenomenon in the general case when the cavity mode and the mechanical mode interact via an off-resonant qubit. Using a Schrieffer–Wolff approximation treatment, we determine the regime where this tripartite hybrid system behaves as an effective cavity optomechanical system in the strong coupling regime. 相似文献
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我们对超导量子比特领域的科学背景、历史起源和早期发展做简要评述.莱格特(Anthony J. Leggett)为这个领域打下了理论基础.克拉克(John Clarke)和他的两个学生马丁尼(John Martinis)和德沃雷(Michel H. Devoret)最早通过偏电流约瑟夫森结,首次观察到约瑟夫森结的量子行为.后来德沃雷实现了电荷量子比特叠加态、电荷-磁通混合量子比特的拉比共振和其他演化及投影测量.中村泰信(Yasunobu Nakamura)首先实现电荷量子比特的量子叠加和拉比振荡,还参与莫伊(J. E. Mooij)组实现了磁通量子比特的拉比振荡和读出. 相似文献
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We investigate the tunneling dynamics of a few bosons with both two-and three-body interactions in a doublewell potential. Uncorrelated tunneling of Rabi oscillation with the minimum period can happen only when the two-and three-body interactions satisfy a critical condition, i.e., the effective interaction energy is minimized. When the atomic interactions are slightly away from the critical condition in the weak interaction regime, the uncorrelated tunneling exhibits collapse-revival character. When the atomic interactions are strong and far away from the critical condition, the correlated tunneling with Rabi oscillation occurs. The tunneling period(the period of collapse-revival) increases(decreases) when the rate between the two-body and three-body interactions is away from the corresponding critical condition or when the number of bosons increases. Further, the tunneling properties are understood with the help of the energy spectrum of the system. Eventually, the effect of the initial configuration on the tunneling dynamics of a few bosons for both odd and even numbers of bosons is studied, which results in intriguing consequences. 相似文献
18.
Tunable mid-infrared lasers based on nonlinear optical frequency conversion play a vital role in application fields including environment monitoring, remote sensing and biomedical diagnosis. The long-term development of near-infrared laser technology has led to a high degree of commercialization of near-infrared pumped lasers. The utilized of the commercial near-infrared laser as the pump source is easy to realize miniaturization, high power and high stability operation of the tunable mid-infrared laser. Nonlinear optical crystal, which is the core component of the tunable mid-infrared laser, determines the output characteristics of the mid-infrared laser source. Suffering from multi-phonon absorption, the tunable output band of traditional oxide crystals is limited to below 4 μm. On the other hand, the most commonly used ZnGeP2 has strong two-photon absorption at 1.06 μm. High-quality mid-infrared crystal pumped by near-infrared laser have remained of great interest in recent years. In this paper, we reviewed the application of the newly developed non-oxide crystals in mid-infrared laser generating. BaGa4Se7 and BaGa4S7 have wide transparency range, high laser damage threshold and nonlinear coefficient. Using a low repetition frequency pump source, the tunable output range covers the entire mid-infrared band, and the output energy achieves mJ-level even in the long wave infrared band. Under a pump repetition rate of hundreds of Hz, the average output power in the mid-wave infrared band reaches 1 W. However, due to the low thermal conductivity of these two crystals and the near-infrared absorption, there is no report on the near-infrared laser pumped source with repetition rate of kHz-level and average output power of W-level. Subsequent research mainly focused on the improvement of pump and crystal cooling conditions. LiGaSe2 and LiGaS2 crystals are suitable for near-infrared ultrashort pulse pumping to produce mid-infrared lasers due to their large band gap. In particular, LiGaS2 crystal has high laser damage threshold and thermal conductivity. At present, there have been many reports about the generation of mid-infrared laser with repetition frequency of kHz or even MHz. The femtosecond laser source based on LiGaS2 crystal has been applied to the research of vibration sum-frequency spectrum detection, biomolecular fingerprint spectrum recognition, etc. However, due to the small geometric size of LiGaSe2 and LiGaS2 crystals in the existing reports, their output powers under nanosecond laser pumping are relatively low. In addition, LiGaSe2 and LiGaS2 crystals have an obvious absorption peak near 8 μm. The transmittance above 8 μm decreases rapidly, so it is not suitable for the generation of long-wave infrared lasers. The improvement of crystal synthesis and growth process will help to play the potential of LiGaS2 crystal in broadband tuning and high-power laser generation. LiInS2 and LiInSe2 are newly developed crystal with high band gap. The laser damage threshold of LiInS2 crystal and LiInSe2 crystal is relatively low, so the existing reports mostly based on picosecond/femtosecond laser system. Under nanosecond laser pumping, it is difficult to achieve mJ-level, high energy mid-infrared laser generation. The current research is mainly focused on broadband tunable mid-infrared laser generation. Although the current output average power is low, LiInS2 and LiInSe2 crystals have high thermal conductivity and low thermo-optical coefficient, so these crystals have the potential to be used in the generation of high repetition rate and high average power mid-infrared lasers. At present, the main bottleneck lies in the synthesis and growth process of large size and high-quality crystals. CdSiP2 crystals have high thermal conductivity, nonlinear coefficient and band gap, and the cutoff wavelength in the short-wave direction is relatively short. Using a near-infrared laser pump source, the output energy reaches mJ-level under low repetition rate operation. The output average power exceed 100 mW with repetition frequency of several MHzs. High efficiency 6~7 μm generation with 1 064 nm laser pumping can be achieved under non-critical phase matching condition. The output band can be expanded to 2~8 μm by combining pump wavelength tuning and angle tuning. CdSiP2 also has great potential in the on-chip application. However, the laser induced damage threshold of CdSiP2 crystal is low, and the transmittance above at 8 μm decreases rapidly, which limits its application in high power and long-wave infrared laser generation. Quasi-phase-matched crystals represent a new research direction of mid-infrared nonlinear optical crystal materials. Quasi-phase matching technology can utilize the maximum nonlinear coefficient and avoid walk-off effect, so tunable mid-infrared source based on quasi-phase-matched crystals have the advantages of high conversion efficiency and can realize mid-infrared output in the whole transparency band. Orientation-patterned gallium phosphide （OP-GaP） has high nonlinear efficient and thermal conductivity. It has great application potential in high power and high efficiency middle infrared laser generation. However, the synthesis of high-quality single crystals with large aperture and high uniformity are difficult. The improvement of material growth technology will significantly improve the output power of existing mid-infrared lasers based on quasi-phase-matched crystal materials. The further research will focus on： 1） improvement of the crystal quality, especially the size and the uniformity of the crystal; 2） improvement of the output characteristics of the near-infrared pump laser; 3） development of the new nonlinear optical crystals. 相似文献
19.
Multiple ionization of atoms and molecules impacted by very high-q fast projectiles in the strong coupling regime （q/v 〉 1） 
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下载免费PDF全文 In this paper, we present a simple theoretical approach to calculate the multiple ionization of big atoms and molecules induced by very high-q fast projectiles in a strong coupling regime （q/v 〉 1）. The results obtained from this approach are in excellent agreement with the available experimental data. A probable scenario of molecular multiple ionization by fast and very high-q projectiles is discussed. The very small computational time required here and the good agreement with the existing experimental data make it a good candidate for studying the multiple ionization of complex molecules under high linear energy transfers. 相似文献
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用全量子理论研究二能级原子单模腔耦合系统,通过理论推导和数值计算得出系统的自发辐射光谱和平均粒子数密度.共振时腔与原子的发射光谱在强耦合与弱耦合区域有所不同,腔发射光谱分裂只出现于强耦合区域,而原子发射光谱由于腔感应透明效应在弱耦合区域出现了缺口.本文系统地研究了原子与腔在失谐时的发射光谱,在好腔机理(腔线宽小于原子线宽g)原子与腔即使在大失谐时腔发射出腔频率的光子,这给当前实验上困惑的特性提供了一个理论依据.为了给腔感应透明效应一个新的深入了解,还研究了原子与腔平均粒子数密度随时间的演化,以及平均粒子数密度与光强度之间的关系.关键词：自发辐射强耦合腔感应透明好腔机理 相似文献