{"title":"Effective photon mass in the presence of gravity gradient emulated by an electromagnetic medium","authors":"Igor Smolyaninov","doi":"10.1364/josab.525365","DOIUrl":"https://doi.org/10.1364/josab.525365","url":null,"abstract":"","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141676005","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}
{"title":"Ultra-broadband invisibility cloaking design of concentric multilayered cylindrical metamaterial","authors":"Tomoya Momose, M. Toma, Kotaro Kajikawa","doi":"10.1364/josab.526175","DOIUrl":"https://doi.org/10.1364/josab.526175","url":null,"abstract":"","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141676690","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}
{"title":"Experimental demonstration of silicon four-mode (de)multiplexer based on cascaded triple-waveguide couplers","authors":"Xiaojun Yu, Wei Jiang","doi":"10.1364/josab.527911","DOIUrl":"https://doi.org/10.1364/josab.527911","url":null,"abstract":"","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141683224","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}
Anton S. Belashov, Evgeny S. Andrianov, Alexander A. Zyablovsky
Strong and ultra-strong coupling in a “cavity–single atom” system is of great interest for both fundamental and applied physics. It is considered that the increase in the coupling strength between a cavity mode and an atom leads, first, to transition from weak to strong coupling and, second, to the ultra-strong coupling regime. In this paper, we refute this common opinion and demonstrate that the transitions between the coupling regimes occur in different sequences for the correlation functions of different orders. We show that for n-th order correlation functions, the transition to the strong coupling regime requires a coupling strength approximately n2/3 times greater than the one for first order correlation functions. In contrast, the transition to the ultra-strong coupling regime manifests in the dynamics of n-th order correlation functions at less coupling strength than in the dynamics of first order correlation functions. As a result, the measurement of high-order correlation functions makes it easier to observe the ultra-strong coupling in “cavity mode–single atom.”
空穴-单原子 "系统中的强耦合和超强耦合对基础物理学和应用物理学都具有重大意义。人们认为，空穴模式与原子之间耦合强度的增加首先会导致从弱耦合到强耦合的过渡，其次会导致超强耦合。在本文中，我们驳斥了这一普遍观点，并证明了不同阶相关函数的耦合机制之间的转变发生在不同的序列中。我们证明，对于 n 阶相关函数，过渡到强耦合机制需要的耦合强度大约是一阶相关函数的 n2/3 倍。与此相反，向超强耦合机制过渡时，n-阶相关函数的动力学耦合强度要小于一阶相关函数的动力学耦合强度。因此，测量高阶相关函数更容易观察到 "空穴模式-单原子 "中的超强耦合。
{"title":"Manifestation of strong and ultra-strong coupling in high-order correlation functions","authors":"Anton S. Belashov, Evgeny S. Andrianov, Alexander A. Zyablovsky","doi":"10.1364/josab.524077","DOIUrl":"https://doi.org/10.1364/josab.524077","url":null,"abstract":"Strong and ultra-strong coupling in a “cavity–single atom” system is of great interest for both fundamental and applied physics. It is considered that the increase in the coupling strength between a cavity mode and an atom leads, first, to transition from weak to strong coupling and, second, to the ultra-strong coupling regime. In this paper, we refute this common opinion and demonstrate that the transitions between the coupling regimes occur in different sequences for the correlation functions of different orders. We show that for <jats:italic>n</jats:italic>-th order correlation functions, the transition to the strong coupling regime requires a coupling strength approximately <jats:italic>n</jats:italic><jats:sup>2/3</jats:sup> times greater than the one for first order correlation functions. In contrast, the transition to the ultra-strong coupling regime manifests in the dynamics of <jats:italic>n</jats:italic>-th order correlation functions at less coupling strength than in the dynamics of first order correlation functions. As a result, the measurement of high-order correlation functions makes it easier to observe the ultra-strong coupling in “cavity mode–single atom.”","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866938","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}
{"title":"Multi-channel Information Transmission via Dual-Frequency Point Space-Time Coding Metasurface","authors":"Xiaohang He, Chenxia Li, Bo Fang, Ying Tian, Liang Chen, Zhi Hong, Xu Jing","doi":"10.1364/josab.530690","DOIUrl":"https://doi.org/10.1364/josab.530690","url":null,"abstract":"","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141684526","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 enhancement effects of an intense short-wavelength infrared laser field in a single micrometer-scale metal funnel were observed in harmonic generation experiments. Low-order harmonics were generated by interacting 32-fs pulses centered at the 2.2-µm wavelength with gases in the funnel structures. The driving laser was an optical parametric amplifier operating at 60-kHz repetition rate. When the peak intensity of the laser beam at the entry of the funnel reached 9.1TW/cm2, third-order harmonic signals were detected. The low limits of the enhancement of the driving laser intensity in 10- and 15-µm funnels were estimated to be 32.4 and 20.8, respectively.
{"title":"Enhanced harmonic generation in metallic funnels driven by short-wave infrared lasers","authors":"Lifeng Wang, Seunghwoi Han, Yi Wu, Zenghu Chang","doi":"10.1364/josab.512192","DOIUrl":"https://doi.org/10.1364/josab.512192","url":null,"abstract":"The enhancement effects of an intense short-wavelength infrared laser field in a single micrometer-scale metal funnel were observed in harmonic generation experiments. Low-order harmonics were generated by interacting 32-fs pulses centered at the 2.2-µm wavelength with gases in the funnel structures. The driving laser was an optical parametric amplifier operating at 60-kHz repetition rate. When the peak intensity of the laser beam at the entry of the funnel reached 9.1TW/cm<jats:sup>2</jats:sup>, third-order harmonic signals were detected. The low limits of the enhancement of the driving laser intensity in 10- and 15-µm funnels were estimated to be 32.4 and 20.8, respectively.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866940","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}
We propose an easy but effective approach to find a transition numerical aperture between the regimes of laser pulse filamentation with nonlinear focusing and with geometric focusing predominance. The suggested method based on the beam profile measurements allows correction of the data provided by spectra measurements. Using a simple semi-analytical model, we study the dependence of the transition numerical aperture on the pulse power and medium nonlinearity. The analysis shows that in condensed media the transition from the nonlinear to geometric focusing regime occurs at much tighter focusing than in air. Moreover, if the medium nonlinear refractive index is high enough, only the nonlinear focusing regime is observed even at numerical apertures close to one, which allows symmetric plasma channel formation.
{"title":"Nonlinear to geometric focusing transition: beam self-cleaning and self-focusing critical power","authors":"D. V. Pushkarev, G. E. Rizaev, L. V. Seleznev","doi":"10.1364/josab.525801","DOIUrl":"https://doi.org/10.1364/josab.525801","url":null,"abstract":"We propose an easy but effective approach to find a transition numerical aperture between the regimes of laser pulse filamentation with nonlinear focusing and with geometric focusing predominance. The suggested method based on the beam profile measurements allows correction of the data provided by spectra measurements. Using a simple semi-analytical model, we study the dependence of the transition numerical aperture on the pulse power and medium nonlinearity. The analysis shows that in condensed media the transition from the nonlinear to geometric focusing regime occurs at much tighter focusing than in air. Moreover, if the medium nonlinear refractive index is high enough, only the nonlinear focusing regime is observed even at numerical apertures close to one, which allows symmetric plasma channel formation.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866939","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}
We present an analytical and numerical study of electromagnetic modes in micro- and nano-fibers (MNFs) where the electric and magnetic fields of the modes are not necessarily orthogonal to each other. We first investigate these modes for different fiber structures including circular- and rectangular-core fibers as well as photonic crystal fibers. We then discuss two specific applications of these modes: (1) generation of hypothetical axions that are coupled to the electromagnetic fields through the dot product of electric and magnetic fields of a mode, E→⋅B→, and (2) a new type of optical trap (optical tweezers) for chiral atoms with magneto-electric cross coupling, where the confining potential again is proportional to E→⋅B→.
{"title":"Non-transverse electromagnetic fields in micro- and nano-fibers","authors":"U. Saglam, D. D. Yavuz","doi":"10.1364/josab.521769","DOIUrl":"https://doi.org/10.1364/josab.521769","url":null,"abstract":"We present an analytical and numerical study of electromagnetic modes in micro- and nano-fibers (MNFs) where the electric and magnetic fields of the modes are not necessarily orthogonal to each other. We first investigate these modes for different fiber structures including circular- and rectangular-core fibers as well as photonic crystal fibers. We then discuss two specific applications of these modes: (1) generation of hypothetical axions that are coupled to the electromagnetic fields through the dot product of electric and magnetic fields of a mode, <jats:italic>E</jats:italic>→⋅<jats:italic>B</jats:italic>→, and (2) a new type of optical trap (optical tweezers) for chiral atoms with magneto-electric cross coupling, where the confining potential again is proportional to <jats:italic>E</jats:italic>→⋅<jats:italic>B</jats:italic>→.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866944","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}
S. Stepanov, E. Hernandez Hernandez, F. Dominguez Serna, K. Garay Palmett
Experimental results on parametric optical processes in saturable ytterbium-doped fibers (YDFs) at the wavelength of 1064 nm are reported. Significant photoinduced change of the refractive index under saturation of the fiber-optical absorption in the near-infrared range enables us to consider this medium as an effective optical Kerr (χ′′′) medium. For pumping, it needs continuous-wave Nd:YAG laser power of 10-mW scale, but the saturation process has the characteristic time ≤1ms, governed by the metastable level lifetime in YDF. We investigate the nearly degenerate collinear configuration of the optical parametric amplification (OPA). Here we focus on unidirectional transformation of the initial amplitude modulation in the incident pump wave to the output phase modulation as a manifestation of OPA in a narrowband case. This effect results from the conventional coupled-wave equations for the signal and idler waves—if one considers them as the modulation sidebands. It can also be treated as a result of the self-phase modulation of the periodically modulated pump in the Kerr medium. OPA gain of about 0.64 with the net gain ≈0.29 was experimentally estimated for the utilized 2-m-long YDF in the frequency band ≈200Hz.
{"title":"Low-frequency parametric amplification in saturable ytterbium-doped fibers at 1064 nm","authors":"S. Stepanov, E. Hernandez Hernandez, F. Dominguez Serna, K. Garay Palmett","doi":"10.1364/josab.524425","DOIUrl":"https://doi.org/10.1364/josab.524425","url":null,"abstract":"Experimental results on parametric optical processes in saturable ytterbium-doped fibers (YDFs) at the wavelength of 1064 nm are reported. Significant photoinduced change of the refractive index under saturation of the fiber-optical absorption in the near-infrared range enables us to consider this medium as an effective optical Kerr (<jats:italic>χ</jats:italic><jats:sup>′′′</jats:sup>) medium. For pumping, it needs continuous-wave Nd:YAG laser power of 10-mW scale, but the saturation process has the characteristic time ≤1ms, governed by the metastable level lifetime in YDF. We investigate the nearly degenerate collinear configuration of the optical parametric amplification (OPA). Here we focus on unidirectional transformation of the initial amplitude modulation in the incident pump wave to the output phase modulation as a manifestation of OPA in a narrowband case. This effect results from the conventional coupled-wave equations for the signal and idler waves—if one considers them as the modulation sidebands. It can also be treated as a result of the self-phase modulation of the periodically modulated pump in the Kerr medium. OPA gain of about 0.64 with the net gain ≈0.29 was experimentally estimated for the utilized 2-m-long YDF in the frequency band ≈200Hz.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866943","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}
Rostislav Arkhipov, Anton Pakhomov, Olga Diachkova, Mikhail Arkhipov, Nikolay Rosanov
An optical Bragg-like microcavity can be formed when extremely short light pulses interacting coherently with the medium collide in the resonant medium. Here we present an analytical approach, based on the approximate solution of the time-dependent Schrödinger equation, that reveals both the cavity formation and its control by the half-cycle pulses colliding in the medium. This approach allows the calculation of cavity properties in the weak-field regime without the need for complex numerical simulations. Beyond the approximate analytical solutions, our analytical results are confirmed by numerical simulations of the Maxwell-Bloch equations. Grating formation is also studied in the strong-field regime, where collisions of self-induced transparency half-cycle pulses occur. The results presented here reveal, to our knowledge, a new type of spatio-temporal photonic crystal in the form of micro-cavities in a simple atomic medium. The results obtained demonstrate the feasibility of attosecond optical switching in a simple atomic medium with half-cycle pulses.
{"title":"Analytical and numerical study of light-induced optical microcavity generation by half-cycle light pulses in the resonant medium","authors":"Rostislav Arkhipov, Anton Pakhomov, Olga Diachkova, Mikhail Arkhipov, Nikolay Rosanov","doi":"10.1364/josab.528871","DOIUrl":"https://doi.org/10.1364/josab.528871","url":null,"abstract":"An optical Bragg-like microcavity can be formed when extremely short light pulses interacting coherently with the medium collide in the resonant medium. Here we present an analytical approach, based on the approximate solution of the time-dependent Schrödinger equation, that reveals both the cavity formation and its control by the half-cycle pulses colliding in the medium. This approach allows the calculation of cavity properties in the weak-field regime without the need for complex numerical simulations. Beyond the approximate analytical solutions, our analytical results are confirmed by numerical simulations of the Maxwell-Bloch equations. Grating formation is also studied in the strong-field regime, where collisions of self-induced transparency half-cycle pulses occur. The results presented here reveal, to our knowledge, a new type of spatio-temporal photonic crystal in the form of micro-cavities in a simple atomic medium. The results obtained demonstrate the feasibility of attosecond optical switching in a simple atomic medium with half-cycle pulses.","PeriodicalId":501621,"journal":{"name":"Journal of the Optical Society of America B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866946","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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