We obtain explicit analytical expressions for the energy spectra of the resonant single- and two-photon Tavis-Cummings models in the asymptotic limit of a large number of atoms, A≫1, and a large number of total excitations, N≫1. We show that both the spectral singularities in the regime N/A∼1 and the equidistant spectra in the regime N/A≫1 can be accurately described in the semiclassical framework.
{"title":"Semiclassical spectra of the single- and two-photon Tavis-Cummings models","authors":"V. A. Beloiarov, I. F. Valtierra, A. B. Klimov","doi":"10.1364/josab.524023","DOIUrl":"https://doi.org/10.1364/josab.524023","url":null,"abstract":"We obtain explicit analytical expressions for the energy spectra of the resonant single- and two-photon Tavis-Cummings models in the asymptotic limit of a large number of atoms, <jats:italic>A</jats:italic>≫1, and a large number of total excitations, <jats:italic>N</jats:italic>≫1. We show that both the spectral singularities in the regime <jats:italic>N</jats:italic>/<jats:italic>A</jats:italic>∼1 and the equidistant spectra in the regime <jats:italic>N</jats:italic>/<jats:italic>A</jats:italic>≫1 can be accurately described in the semiclassical framework.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":"13 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The total angular momentum of light has received attention for its application in a variety of phenomena such as optical communication, optical forces, and sensing. However, the quantum behavior including the commutation relations has been relatively less explored. Here, we derive the correct commutation relation for the total angular momentum of light using both relativistic and non-relativistic approaches. An important outcome of our work is the proof that the widely assumed quantum commutation relation for the total observable angular momentum of light is fundamentally incorrect. Our work will motivate experiments and lead to new insights on the quantum behavior of the angular momentum of light.
{"title":"What are the quantum commutation relations for the total angular momentum of light? tutorial","authors":"Pronoy Das, Li-Ping Yang, Zubin Jacob","doi":"10.1364/josab.524752","DOIUrl":"https://doi.org/10.1364/josab.524752","url":null,"abstract":"The total angular momentum of light has received attention for its application in a variety of phenomena such as optical communication, optical forces, and sensing. However, the quantum behavior including the commutation relations has been relatively less explored. Here, we derive the correct commutation relation for the total angular momentum of light using both relativistic and non-relativistic approaches. An important outcome of our work is the proof that the widely assumed quantum commutation relation for the total observable angular momentum of light is fundamentally incorrect. Our work will motivate experiments and lead to new insights on the quantum behavior of the angular momentum of light.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Across the spectrum of scientific inquiry and practical applications, the emergence of artificial intelligence (AI) and machine learning (ML) has comprehensively revolutionized problem-solving methodologies. This tutorial explores key aspects of AI/ML and their remarkable role in augmenting the capabilities of optics and photonics technologies. Beginning with fundamental definitions and paradigms, the tutorial progresses to classical machine learning algorithms, with examples employing support vector machines and random forests. Extensive discussion of deep learning encompasses the backpropagation algorithm and artificial neural networks, with examples demonstrating the applications of dense and convolutional neural networks. Data augmentation and transfer learning are examined next as effective strategies for handling scenarios with limited datasets. Finally, the necessity of alleviating the burden of data collection and labeling is discussed, motivating the investigation of unsupervised and semi-supervised learning strategies as well as the utilization of reinforcement learning. By providing a structured exploration of AI/ML techniques, this tutorial equips researchers with the essential tools to begin leveraging AI’s transformative potential within the expansive realm of optics and photonics.
{"title":"Artificial intelligence and machine learning in optics: tutorial","authors":"Ksenia Yadav, Serge Bidnyk, Ashok Balakrishnan","doi":"10.1364/josab.525182","DOIUrl":"https://doi.org/10.1364/josab.525182","url":null,"abstract":"Across the spectrum of scientific inquiry and practical applications, the emergence of artificial intelligence (AI) and machine learning (ML) has comprehensively revolutionized problem-solving methodologies. This tutorial explores key aspects of AI/ML and their remarkable role in augmenting the capabilities of optics and photonics technologies. Beginning with fundamental definitions and paradigms, the tutorial progresses to classical machine learning algorithms, with examples employing support vector machines and random forests. Extensive discussion of deep learning encompasses the backpropagation algorithm and artificial neural networks, with examples demonstrating the applications of dense and convolutional neural networks. Data augmentation and transfer learning are examined next as effective strategies for handling scenarios with limited datasets. Finally, the necessity of alleviating the burden of data collection and labeling is discussed, motivating the investigation of unsupervised and semi-supervised learning strategies as well as the utilization of reinforcement learning. By providing a structured exploration of AI/ML techniques, this tutorial equips researchers with the essential tools to begin leveraging AI’s transformative potential within the expansive realm of optics and photonics.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Brian de Keijzer, Pieter J. van Essen, Peter M. Kraus
Solid-state high-harmonic generation is intrinsically sensitive to band structure, carrier population, and carrier scattering. As such, solid-state high-harmonic generation is increasingly used as a probe for femtosecond time-resolved pump-probe experiments. So far, most experimental pump-probe studies have reported photoexcitation-induced amplitude suppression of high-harmonic generation in solid-state media, yet the origins of this phenomenon remain elusive. Through simulations based on the semiconductor Bloch equations, we identify the dephasing of the coherent carrier population as the primary mechanism driving this suppression. Furthermore, we find band gap renormalization to be a source for phase shifts of high harmonics. We introduce an analytical model, based on a semi-classical action, that supports our numerical outcomes.
{"title":"Effect of photoexcitation on high-harmonic generation in semiconductors","authors":"Brian de Keijzer, Pieter J. van Essen, Peter M. Kraus","doi":"10.1364/josab.520973","DOIUrl":"https://doi.org/10.1364/josab.520973","url":null,"abstract":"Solid-state high-harmonic generation is intrinsically sensitive to band structure, carrier population, and carrier scattering. As such, solid-state high-harmonic generation is increasingly used as a probe for femtosecond time-resolved pump-probe experiments. So far, most experimental pump-probe studies have reported photoexcitation-induced amplitude suppression of high-harmonic generation in solid-state media, yet the origins of this phenomenon remain elusive. Through simulations based on the semiconductor Bloch equations, we identify the dephasing of the coherent carrier population as the primary mechanism driving this suppression. Furthermore, we find band gap renormalization to be a source for phase shifts of high harmonics. We introduce an analytical model, based on a semi-classical action, that supports our numerical outcomes.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jinzhong Zhu, Yongbao Xiao, Yao Ji, Jialong Li, Changsheng Yang, Qilai Zhao, Weichao Wang, Qinyuan Zhang
The utilization of single-frequency fiber lasers spans critical domains including gravitational wave detection, coherent optical communication, and atomic physics. Glass fibers doped with rare earth ions serve as pivotal gain media for them, and the quest for advanced fiber matrices is paramount. Herein, a newly developed Nd3+-doped AlF3-Na2SO4-KPO3-Zn(PO3)2 glass is reported. The glass showcases exceptional attributes including high anti-crystallization stability (>150∘C), elastic modulus (75 GPa), chemical durability (8.1×10−7g⋅cm−2⋅min−1), Nd3+ concentration (>1020ions/cm3), broad effective linewidth (45 nm), and extended lifetime (465 µs), surpassing those of conventional silica and phosphate glasses. Moreover, a custom-designed double-clad Nd3+-doped fiber with a net gain coefficient of 3.2 dB/cm at 1064 nm is fabricated, and single-frequency laser output with a narrow linewidth of 11 kHz has been obtained utilizing a 1.4-cm-long fiber, indicating the potential of this fiber as a promising gain medium for ultra-narrow-linewidth single-frequency fiber lasers.
{"title":"Nd3+-doped double-clad fluoro-sulfo-phosphate fiber for a compact kilohertz-linewidth single-frequency laser","authors":"Jinzhong Zhu, Yongbao Xiao, Yao Ji, Jialong Li, Changsheng Yang, Qilai Zhao, Weichao Wang, Qinyuan Zhang","doi":"10.1364/josab.529722","DOIUrl":"https://doi.org/10.1364/josab.529722","url":null,"abstract":"The utilization of single-frequency fiber lasers spans critical domains including gravitational wave detection, coherent optical communication, and atomic physics. Glass fibers doped with rare earth ions serve as pivotal gain media for them, and the quest for advanced fiber matrices is paramount. Herein, a newly developed Nd<jats:sup>3+</jats:sup>-doped AlF<jats:sub>3</jats:sub>-Na<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub>-KPO<jats:sub>3</jats:sub>-Zn(PO<jats:sub>3</jats:sub>)<jats:sub>2</jats:sub> glass is reported. The glass showcases exceptional attributes including high anti-crystallization stability (>150<jats:sup>∘</jats:sup>C), elastic modulus (75 GPa), chemical durability (8.1×10<jats:sup>−7</jats:sup>g⋅cm<jats:sup>−2</jats:sup>⋅min<jats:sup>−1</jats:sup>), Nd<jats:sup>3+</jats:sup> concentration (>10<jats:sup>20</jats:sup>ions/cm<jats:sup>3</jats:sup>), broad effective linewidth (45 nm), and extended lifetime (465 µs), surpassing those of conventional silica and phosphate glasses. Moreover, a custom-designed double-clad Nd<jats:sup>3+</jats:sup>-doped fiber with a net gain coefficient of 3.2 dB/cm at 1064 nm is fabricated, and single-frequency laser output with a narrow linewidth of 11 kHz has been obtained utilizing a 1.4-cm-long fiber, indicating the potential of this fiber as a promising gain medium for ultra-narrow-linewidth single-frequency fiber lasers.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Saeedeh Ahadi, Mohammad Neshat, Mohammad Kazem Moravvej-Farshi
We propose a versatile platform to design tunable metasurface devices based on Au/n-Si Schottky diodes embedded in a split-ring resonator (SRR) devised on a Si-on-insulator (SOI) wafer. The horizontally formed diodes are connected in the SRR radial direction, reducing the overall junction capacitance of the metasurface array compared to its counterparts with vertically formed Schottky junctions. This reduction in the junction capacitance has an essential role in the switching speed of the metasurface between the On and Off states. By carefully varying the externally applied bias voltage to the Schottky diodes, one can manipulate the incident THz signal at the metasurface resonance frequencies by converting its resonance mode by switching states. We use the forenamed platform to design three fundamental THz devices: a modulator, a polarization switch, and a polarizing beam splitter. A reverse bias of VR=5V excites two LC resonances at 0.3 THz and 0.89 THz in the modulator, which fade away by switching the gate voltage to VF=0.49V, exciting a dipole resonance in the metasurface at 0.75 THz. The numerical results show that this THz modulator enjoys modulation depths of ≥92% at the LC resonances and a phase modulation of ∼1.16rad at 0.86 THz. An identical electric bias change of the Schottky diodes in the polarization switch alters the resonators from anisotropic to isotropic, changing the output wave polarization from circular with nearly 99% of the circular polarization percentage to linear or quasi-linear at four frequencies simultaneously. Additionally, the proposed THz polarization splitter can deflect the cross-polarized transmitted component from the normally outgoing co-polarized one with an angle of 70° at 0.56 THz. The splitting ratio is switched from 1:1 in reverse bias to 14:1 in forward bias by changing the bias to forward bias. We expect that the proposed designs in the THz frequency domain, benefiting from the several hundred GHz switching speed of the Schottky diodes array, will be beneficial in applications such as analysis of the complex organic structures or polarization modulation and polarization-dependent multiplexing/demultiplexing in wireless communication systems.
{"title":"Versatile platform for electrically reconfigurable THz devices based on silicon Schottky-metasurfaces","authors":"Saeedeh Ahadi, Mohammad Neshat, Mohammad Kazem Moravvej-Farshi","doi":"10.1364/josab.523446","DOIUrl":"https://doi.org/10.1364/josab.523446","url":null,"abstract":"We propose a versatile platform to design tunable metasurface devices based on Au/n-Si Schottky diodes embedded in a split-ring resonator (SRR) devised on a Si-on-insulator (SOI) wafer. The horizontally formed diodes are connected in the SRR radial direction, reducing the overall junction capacitance of the metasurface array compared to its counterparts with vertically formed Schottky junctions. This reduction in the junction capacitance has an essential role in the switching speed of the metasurface between the On and Off states. By carefully varying the externally applied bias voltage to the Schottky diodes, one can manipulate the incident THz signal at the metasurface resonance frequencies by converting its resonance mode by switching states. We use the forenamed platform to design three fundamental THz devices: a modulator, a polarization switch, and a polarizing beam splitter. A reverse bias of <jats:italic>V</jats:italic><jats:sub> <jats:italic>R</jats:italic> </jats:sub>=5V excites two LC resonances at 0.3 THz and 0.89 THz in the modulator, which fade away by switching the gate voltage to <jats:italic>V</jats:italic><jats:sub> <jats:italic>F</jats:italic> </jats:sub>=0.49V, exciting a dipole resonance in the metasurface at 0.75 THz. The numerical results show that this THz modulator enjoys modulation depths of ≥92% at the LC resonances and a phase modulation of ∼1.16rad at 0.86 THz. An identical electric bias change of the Schottky diodes in the polarization switch alters the resonators from anisotropic to isotropic, changing the output wave polarization from circular with nearly 99% of the circular polarization percentage to linear or quasi-linear at four frequencies simultaneously. Additionally, the proposed THz polarization splitter can deflect the cross-polarized transmitted component from the normally outgoing co-polarized one with an angle of 70° at 0.56 THz. The splitting ratio is switched from 1:1 in reverse bias to 14:1 in forward bias by changing the bias to forward bias. We expect that the proposed designs in the THz frequency domain, benefiting from the several hundred GHz switching speed of the Schottky diodes array, will be beneficial in applications such as analysis of the complex organic structures or polarization modulation and polarization-dependent multiplexing/demultiplexing in wireless communication systems.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, we analyze the harmonically driven Jaynes–Cummings and Lipkin–Meshkov–Glick models using both numerical integration of time-dependent Hamiltonians and Floquet theory. For a separation of time scales between the drive and intrinsic Rabi oscillations in the former model, the driving results in an effective periodic reversal of time. The corresponding Floquet Hamiltonian is a Wannier–Stark model, which can be analytically solved. Despite the chaotic nature of the driven Lipkin–Meshkov–Glick model, moderate system sizes can display qualitatively different behaviors under varying system parameters. Ergodicity arises in systems that are neither adiabatic nor diabatic, owing to repeated multi-level Landau–Zener transitions. Chaotic behavior, observed in slow driving, manifests as random jumps in the magnetization, suggesting potential utility as a random number generator. Furthermore, we discuss both models in terms of a Floquet Fock state lattice.
{"title":"Floquet analysis perspective of driven light–matter interaction models","authors":"Jonas Larson","doi":"10.1364/josab.524005","DOIUrl":"https://doi.org/10.1364/josab.524005","url":null,"abstract":"In this paper, we analyze the harmonically driven Jaynes–Cummings and Lipkin–Meshkov–Glick models using both numerical integration of time-dependent Hamiltonians and Floquet theory. For a separation of time scales between the drive and intrinsic Rabi oscillations in the former model, the driving results in an effective periodic reversal of time. The corresponding Floquet Hamiltonian is a Wannier–Stark model, which can be analytically solved. Despite the chaotic nature of the driven Lipkin–Meshkov–Glick model, moderate system sizes can display qualitatively different behaviors under varying system parameters. Ergodicity arises in systems that are neither adiabatic nor diabatic, owing to repeated multi-level Landau–Zener transitions. Chaotic behavior, observed in slow driving, manifests as random jumps in the magnetization, suggesting potential utility as a random number generator. Furthermore, we discuss both models in terms of a Floquet Fock state lattice.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":"102 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Recent years have witnessed great interest in the optical chirality of vortex beams carrying orbital angular momentum (OAM). An interesting area of research is the control of such an optical chirality. In this work, we report a study of the controllable optical chirality of vortex beams via photonic jets. Within the framework of the generalized Lorenz–Mie theory (GLMT), we present the analytical expressions for describing the electromagnetic fields of the photonic jets formed on the shadow side of the micro-sized dielectric spheres illuminated by Laguerre–Gaussian (LG) vortex beams. The optical chirality of the vortex beams focused in the near-field area of the photonic jets is numerically simulated. It is revealed that the optical chirality of the vortex beams is drastically enhanced via photonic jets. Moreover, the optical chirality of the vortex beams focused in the near-field area of the photonic jets can be controlled by choosing the radius and refractive index of the dielectric sphere. Such controllable optical chirality is expected to be applicable in chiral manipulation, detection, and recognition.
{"title":"Controllable optical chirality of vortex beams via photonic jets","authors":"Yiyu Shi, Zhiwei Cui, Xinyi Cao, Zhanfei Liu, Wenjuan Zhao","doi":"10.1364/josab.528188","DOIUrl":"https://doi.org/10.1364/josab.528188","url":null,"abstract":"Recent years have witnessed great interest in the optical chirality of vortex beams carrying orbital angular momentum (OAM). An interesting area of research is the control of such an optical chirality. In this work, we report a study of the controllable optical chirality of vortex beams via photonic jets. Within the framework of the generalized Lorenz–Mie theory (GLMT), we present the analytical expressions for describing the electromagnetic fields of the photonic jets formed on the shadow side of the micro-sized dielectric spheres illuminated by Laguerre–Gaussian (LG) vortex beams. The optical chirality of the vortex beams focused in the near-field area of the photonic jets is numerically simulated. It is revealed that the optical chirality of the vortex beams is drastically enhanced via photonic jets. Moreover, the optical chirality of the vortex beams focused in the near-field area of the photonic jets can be controlled by choosing the radius and refractive index of the dielectric sphere. Such controllable optical chirality is expected to be applicable in chiral manipulation, detection, and recognition.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rong Lin, Jin Yao, Jingcheng Zhang, Xiaoyu Che, Borui Leng, Zhihui Wang, Muku Chen, Din Ping Tsai
Abrupt autofocusing (AAF) beams, known for their non-diffractive properties, extended focal depth, and self-healing capabilities, are advantageous over conventional Gaussian beams in the biomedical field. Compared to the previous method that can only generate a passive AAF beam, we introduce metasurfaces to achieve a dynamically steered AAF beam at the incident wavelength of 532 nm. By rotating the two metasurfaces in opposite directions of an angle θ, both the generated position of the AAF beam and the autofocusing direction can be altered. Our theoretical analysis and full-wave simulation results confirmed that the deflection angle of the AAF beam can be finely adjusted from to 11° without significantly affecting the focal length or focusing efficiency. This capability allows for precision operation in biomedical applications, including enhanced laser surgery, optical tweezing, and optimized photodynamic therapy.
{"title":"Steering abrupt autofocusing beams with metasurfaces [Invited]","authors":"Rong Lin, Jin Yao, Jingcheng Zhang, Xiaoyu Che, Borui Leng, Zhihui Wang, Muku Chen, Din Ping Tsai","doi":"10.1364/josab.529064","DOIUrl":"https://doi.org/10.1364/josab.529064","url":null,"abstract":"Abrupt autofocusing (AAF) beams, known for their non-diffractive properties, extended focal depth, and self-healing capabilities, are advantageous over conventional Gaussian beams in the biomedical field. Compared to the previous method that can only generate a passive AAF beam, we introduce metasurfaces to achieve a dynamically steered AAF beam at the incident wavelength of 532 nm. By rotating the two metasurfaces in opposite directions of an angle <jats:italic>θ</jats:italic>, both the generated position of the AAF beam and the autofocusing direction can be altered. Our theoretical analysis and full-wave simulation results confirmed that the deflection angle of the AAF beam can be finely adjusted from to 11° without significantly affecting the focal length or focusing efficiency. This capability allows for precision operation in biomedical applications, including enhanced laser surgery, optical tweezing, and optimized photodynamic therapy.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Strong coupling between a single resonator mode and a single quantum emitter is key to a plethora of experiments and applications in quantum science and technology and is commonly described by means of the Jaynes–Cummings model. Here, we show that the Jaynes–Cummings model only applies when the cavity does not significantly change the emitter’s decay rate into free-space. Most notably, the predictions made by the Jaynes–Cummings model become increasingly wrong when approaching the ideal emitter-resonator systems with no free-space decay channels. We present a Hamiltonian that provides, within the validity range of the rotating wave approximation, a correct theoretical description that applies to all regimes. As minimizing the coupling to free-space modes is paramount for many cavity-based applications, a correct description of strong light-matter interaction is therefore crucial for developing and optimizing quantum protocols.
{"title":"Jaynes–Cummings model breaks down when the cavity geometry significantly reduces free-space emission","authors":"Martin Blaha, Arno Rauschenbeutel, Jürgen Volz","doi":"10.1364/josab.522498","DOIUrl":"https://doi.org/10.1364/josab.522498","url":null,"abstract":"Strong coupling between a single resonator mode and a single quantum emitter is key to a plethora of experiments and applications in quantum science and technology and is commonly described by means of the Jaynes–Cummings model. Here, we show that the Jaynes–Cummings model only applies when the cavity does not significantly change the emitter’s decay rate into free-space. Most notably, the predictions made by the Jaynes–Cummings model become increasingly wrong when approaching the ideal emitter-resonator systems with no free-space decay channels. We present a Hamiltonian that provides, within the validity range of the rotating wave approximation, a correct theoretical description that applies to all regimes. As minimizing the coupling to free-space modes is paramount for many cavity-based applications, a correct description of strong light-matter interaction is therefore crucial for developing and optimizing quantum protocols.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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