Pub Date : 2023-06-26DOI: 10.1109/CLEO/Europe-EQEC57999.2023.10231363
N. Namekata, Nobuaki Kobayashi, Kenya Nomura, Tokuei Sako, Norio Takata, S. Inoue
Optical coherence tomography (OCT) is a well-established non-contact and non-invasive method for three-dimensional structural imaging of complex samples [1]. This technique is actively used for various biomedical applications, such as medical diagnosis. However, the relatively shallow penetration depth is considered a serious limitation for many applications. Optical time-of-flight (TOF) measurements provide an alternative way to acquire three-dimensional structural images. A temporal resolution of 150 femtoseconds corresponding to the axial resolution comparable to OCT has been reported [2]. The penetration depth would be enhanced by using the wavelength in the spectral window of 1550 - 1800 nm, because the scattering and absorption losses can be reduced. Besides them, the phenomenon of multiple scattering also makes it difficult to achieve meaningful structural information at deeper penetration depths. To enhance image contrast at larger penetration depths, multiply scattered photons must be removed. Although they overlap in both spectral and time domain with the singly reflected signal photons, they would be removed by the mode-selective up-conversion single-photon detector (UCSPD) [3], [4]. We report on the optical TOF measurement system using the time-resolved and mode-selective UCSPD and its application to the tomographic image acquisition of a mouse brain.
{"title":"Quantum Optical Tomography Using a Time-Resolved and Mode-Selective Frequency-Up-Conversion Detector","authors":"N. Namekata, Nobuaki Kobayashi, Kenya Nomura, Tokuei Sako, Norio Takata, S. Inoue","doi":"10.1109/CLEO/Europe-EQEC57999.2023.10231363","DOIUrl":"https://doi.org/10.1109/CLEO/Europe-EQEC57999.2023.10231363","url":null,"abstract":"Optical coherence tomography (OCT) is a well-established non-contact and non-invasive method for three-dimensional structural imaging of complex samples [1]. This technique is actively used for various biomedical applications, such as medical diagnosis. However, the relatively shallow penetration depth is considered a serious limitation for many applications. Optical time-of-flight (TOF) measurements provide an alternative way to acquire three-dimensional structural images. A temporal resolution of 150 femtoseconds corresponding to the axial resolution comparable to OCT has been reported [2]. The penetration depth would be enhanced by using the wavelength in the spectral window of 1550 - 1800 nm, because the scattering and absorption losses can be reduced. Besides them, the phenomenon of multiple scattering also makes it difficult to achieve meaningful structural information at deeper penetration depths. To enhance image contrast at larger penetration depths, multiply scattered photons must be removed. Although they overlap in both spectral and time domain with the singly reflected signal photons, they would be removed by the mode-selective up-conversion single-photon detector (UCSPD) [3], [4]. We report on the optical TOF measurement system using the time-resolved and mode-selective UCSPD and its application to the tomographic image acquisition of a mouse brain.","PeriodicalId":19477,"journal":{"name":"Oceans","volume":"195 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81426930","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}
Pub Date : 2023-06-26DOI: 10.1109/CLEO/Europe-EQEC57999.2023.10231843
Andrea Rossetti, M. Ludwig, A. Leitenstorfer, D. Brida
Carrier-envelope-phase stable single-cycle laser pulses are employed to coherently control field-induced current across a nanojunction. Scanning the sample position along the focus, the effect of the Gouy phase on the transport process is investigated.
{"title":"Effect of the Gouy-Phase on Field-Induced Transport Across a Nanojunction","authors":"Andrea Rossetti, M. Ludwig, A. Leitenstorfer, D. Brida","doi":"10.1109/CLEO/Europe-EQEC57999.2023.10231843","DOIUrl":"https://doi.org/10.1109/CLEO/Europe-EQEC57999.2023.10231843","url":null,"abstract":"Carrier-envelope-phase stable single-cycle laser pulses are employed to coherently control field-induced current across a nanojunction. Scanning the sample position along the focus, the effect of the Gouy phase on the transport process is investigated.","PeriodicalId":19477,"journal":{"name":"Oceans","volume":"93 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84278607","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}
Pub Date : 2023-06-26DOI: 10.1109/cleo/europe-eqec57999.2023.10231981
Yazan Lampert, Francesco Bertot, Alexa Herter, A. Shams-Ansari, Alessandro Tomasino, S. Rajabali, Marko Lončar, Ileana-Cristina Benea-Chelmus
Terahertz science and technology is possibly now at an inflection point where integrated photonic circuits become increasingly viable sources and detectors of such high-frequency radiation. Generation in both second order [1] and third order [2]–[4] nonlinear waveguides and architectures thereof has exploited either optical rectification or microcomb generation with subsequent optical-to-terahertz conversion at a uni-travelling carrier photodiode. These initial demonstrations showcase a possible route towards miniaturized terahertz chips that are seamlessly integrated with photonics.
{"title":"Miniaturized Terahertz Photonic Chips","authors":"Yazan Lampert, Francesco Bertot, Alexa Herter, A. Shams-Ansari, Alessandro Tomasino, S. Rajabali, Marko Lončar, Ileana-Cristina Benea-Chelmus","doi":"10.1109/cleo/europe-eqec57999.2023.10231981","DOIUrl":"https://doi.org/10.1109/cleo/europe-eqec57999.2023.10231981","url":null,"abstract":"Terahertz science and technology is possibly now at an inflection point where integrated photonic circuits become increasingly viable sources and detectors of such high-frequency radiation. Generation in both second order [1] and third order [2]–[4] nonlinear waveguides and architectures thereof has exploited either optical rectification or microcomb generation with subsequent optical-to-terahertz conversion at a uni-travelling carrier photodiode. These initial demonstrations showcase a possible route towards miniaturized terahertz chips that are seamlessly integrated with photonics.","PeriodicalId":19477,"journal":{"name":"Oceans","volume":"13 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84862706","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}
Pub Date : 2023-06-26DOI: 10.1109/CLEO/Europe-EQEC57999.2023.10232844
Stree Vithya Arumugam, C. Jisha, A. Alberucci, Stefan Nolte
Optical waveguides usually exploit modulation of the dynamic phase, i.e., transverse gradient in the refractive index, to guide light. Recently, a novel type of optical waveguides based upon the Pancharatnam-Berry phase (PBP) has been introduced [1]. The PBP is a type of geometric phase which is determined by the path traced by the polarization on the Poincaré sphere. For example, PBP gained by a circularly polarized (CP) beam after crossing a half-wave plate (HWP) is twice the rotation angle of the crystal, the sign being dictated by the photon helicity [2]. Hence, an inhomogeneous rotation in the transverse plane induces a transverse phase gradient. However, the PBP does not accumulate in propagation if the structure is uniform along the longitudinal (propagation) direction. A net accumulation, and thus localization, is achieved when the anisotropic material is periodically perturbed along the propagation direction. The optimum is indeed attained when the longitudinal modulation is synchronized with the natural rotation of the polarization [1], [3].
{"title":"Optical Dispersion in Waveguides Based upon the Pancharatnam-Berry Phase","authors":"Stree Vithya Arumugam, C. Jisha, A. Alberucci, Stefan Nolte","doi":"10.1109/CLEO/Europe-EQEC57999.2023.10232844","DOIUrl":"https://doi.org/10.1109/CLEO/Europe-EQEC57999.2023.10232844","url":null,"abstract":"Optical waveguides usually exploit modulation of the dynamic phase, i.e., transverse gradient in the refractive index, to guide light. Recently, a novel type of optical waveguides based upon the Pancharatnam-Berry phase (PBP) has been introduced [1]. The PBP is a type of geometric phase which is determined by the path traced by the polarization on the Poincaré sphere. For example, PBP gained by a circularly polarized (CP) beam after crossing a half-wave plate (HWP) is twice the rotation angle of the crystal, the sign being dictated by the photon helicity [2]. Hence, an inhomogeneous rotation in the transverse plane induces a transverse phase gradient. However, the PBP does not accumulate in propagation if the structure is uniform along the longitudinal (propagation) direction. A net accumulation, and thus localization, is achieved when the anisotropic material is periodically perturbed along the propagation direction. The optimum is indeed attained when the longitudinal modulation is synchronized with the natural rotation of the polarization [1], [3].","PeriodicalId":19477,"journal":{"name":"Oceans","volume":"4 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85005175","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}
Pub Date : 2023-06-26DOI: 10.1109/CLEO/Europe-EQEC57999.2023.10232176
Jianling Xiao, Libin Yan, T. Plaskocinski, Mohammad Biabanifard, Saydulla Persheyev, Meisam Askari, Andrea Di Falco
Metasurfaces can manipulate light in desired ways by accurate design of the geometrical parameters and arrangement of two-dimensional meta-atoms. Each pixel can be individually tuned to control spatially the amplitude, phase, and polarization of reflected or transmitted light [1]. Holographic metasurfaces are practical tools to achieve functional multiplexing since different images can be encoded in a single metasurface using different properties of the light, such as wavelength, angular momentum, amplitude, and polarization [2]. These images can also be reconstructed or switchable depending on mechanical stretching, applying different voltage, incident angle, chemical reaction, and surrounding medium [3]. The advantage of multiplexing and tunability makes holographic metasurface an excellent candidate for application in encryption, display and sensing [4].
{"title":"Environment-Dependent Holographic Metasurfaces in the Visible Range","authors":"Jianling Xiao, Libin Yan, T. Plaskocinski, Mohammad Biabanifard, Saydulla Persheyev, Meisam Askari, Andrea Di Falco","doi":"10.1109/CLEO/Europe-EQEC57999.2023.10232176","DOIUrl":"https://doi.org/10.1109/CLEO/Europe-EQEC57999.2023.10232176","url":null,"abstract":"Metasurfaces can manipulate light in desired ways by accurate design of the geometrical parameters and arrangement of two-dimensional meta-atoms. Each pixel can be individually tuned to control spatially the amplitude, phase, and polarization of reflected or transmitted light [1]. Holographic metasurfaces are practical tools to achieve functional multiplexing since different images can be encoded in a single metasurface using different properties of the light, such as wavelength, angular momentum, amplitude, and polarization [2]. These images can also be reconstructed or switchable depending on mechanical stretching, applying different voltage, incident angle, chemical reaction, and surrounding medium [3]. The advantage of multiplexing and tunability makes holographic metasurface an excellent candidate for application in encryption, display and sensing [4].","PeriodicalId":19477,"journal":{"name":"Oceans","volume":"21 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85087264","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}
Pub Date : 2023-06-26DOI: 10.1109/cleo/europe-eqec57999.2023.10232794
Raja Sen, N. Vast, J. Sjakste
With the advance of materials fabrication techniques and increase of computational power during the past two decades, the research aiming to enhance the efficiency of thermoelectric devices, with the search of new materials and manipulation of materials properties at the nanoscale, has attracted significant interest. In general, the efficiency of thermoelectric materials, measured by the figure of merit ZT, directly depends on the Seebeck coefficient of the material. In the present work, we have studied, by combining the density functional theory calculations of the electron-phonon [1], [2] and phonon-phonon [3] interactions, the enhancement of the Seebeck coefficient due to electron-phonon coupling, known as the “phonon-drag” effect [4]. To account for this effect, we have solved the linearized Boltzmann equation for electronic transport in presence of non-equilibrium phonon populations introduced by a temperature gradient [5]. In order to understand the phonon drag effect at the nanoscale, we have studied the effect of direction-dependent nano-structuring effect on the Seebeck coefficient of silicon. We will present our recent results related to phonon and/or impurity limited carrier mobility, as well as the variation of the Seebeck coefficient of bulk and nanostructured silicon with temperature and carrier concentrations. Our results for $n$-doped silicon not only show a good agreement with the experimental data in both bulk samples [6] and nanostructures [7] but also pave the way to further understand the contribution of phonon-drag in other semiconductor nanostructures [8], which still remain largely unexplored.
{"title":"Ab initio Calculations of the Thermoelectric Phonon Drag Effect in Semiconductor Nanostructures","authors":"Raja Sen, N. Vast, J. Sjakste","doi":"10.1109/cleo/europe-eqec57999.2023.10232794","DOIUrl":"https://doi.org/10.1109/cleo/europe-eqec57999.2023.10232794","url":null,"abstract":"With the advance of materials fabrication techniques and increase of computational power during the past two decades, the research aiming to enhance the efficiency of thermoelectric devices, with the search of new materials and manipulation of materials properties at the nanoscale, has attracted significant interest. In general, the efficiency of thermoelectric materials, measured by the figure of merit ZT, directly depends on the Seebeck coefficient of the material. In the present work, we have studied, by combining the density functional theory calculations of the electron-phonon [1], [2] and phonon-phonon [3] interactions, the enhancement of the Seebeck coefficient due to electron-phonon coupling, known as the “phonon-drag” effect [4]. To account for this effect, we have solved the linearized Boltzmann equation for electronic transport in presence of non-equilibrium phonon populations introduced by a temperature gradient [5]. In order to understand the phonon drag effect at the nanoscale, we have studied the effect of direction-dependent nano-structuring effect on the Seebeck coefficient of silicon. We will present our recent results related to phonon and/or impurity limited carrier mobility, as well as the variation of the Seebeck coefficient of bulk and nanostructured silicon with temperature and carrier concentrations. Our results for $n$-doped silicon not only show a good agreement with the experimental data in both bulk samples [6] and nanostructures [7] but also pave the way to further understand the contribution of phonon-drag in other semiconductor nanostructures [8], which still remain largely unexplored.","PeriodicalId":19477,"journal":{"name":"Oceans","volume":"69 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85143144","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}
Pub Date : 2023-06-26DOI: 10.1109/CLEO/Europe-EQEC57999.2023.10232102
Szabolcs Turnár, Balázs Róbert Sarkadi, Spencer W. Jolly, J. Hebling, Z. Tibai
Due to the significantly increased peak electric field of available terahertz (THz) pulses, various THz-driven particle accelerators and manipulators have been demonstrated in the last decade, such as THz pulse driven waveguide structure [1], inverse free-electron laser [2] and electron accelerator and manipulator [3]. Recently we have proposed a table-top electron accelerator setup powered by THz pulses, in which the electron source was a krypton gas jet [4]. In our numerical model we have simulated the whole physical process and considered the ionization procedure combining with the THz induced electron acceleration. The model shows a significant influence of the ionization on acceleration mechanisms.
{"title":"Acceleration of Electrons from Krypton Gas Plasma Using THz Pulses","authors":"Szabolcs Turnár, Balázs Róbert Sarkadi, Spencer W. Jolly, J. Hebling, Z. Tibai","doi":"10.1109/CLEO/Europe-EQEC57999.2023.10232102","DOIUrl":"https://doi.org/10.1109/CLEO/Europe-EQEC57999.2023.10232102","url":null,"abstract":"Due to the significantly increased peak electric field of available terahertz (THz) pulses, various THz-driven particle accelerators and manipulators have been demonstrated in the last decade, such as THz pulse driven waveguide structure [1], inverse free-electron laser [2] and electron accelerator and manipulator [3]. Recently we have proposed a table-top electron accelerator setup powered by THz pulses, in which the electron source was a krypton gas jet [4]. In our numerical model we have simulated the whole physical process and considered the ionization procedure combining with the THz induced electron acceleration. The model shows a significant influence of the ionization on acceleration mechanisms.","PeriodicalId":19477,"journal":{"name":"Oceans","volume":"05 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85979555","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}
Pub Date : 2023-06-26DOI: 10.1109/CLEO/Europe-EQEC57999.2023.10231761
A. Di Francescantonio, A. Zilli, D. Rocco, F. Conti, V. Vinel, A. Borne, M. Morassi, A. Lemaître, P. Biagioni, L. Duò, C. De Angelis, G. Leo, M. Finazzi, M. Celebrano
Frequency upconversion of near-infrared photons to the visible range is strategical for information technology, as it can provide an alternative for the read out of telecom signals using efficient silicon-based detectors. Light upconversion is a nonlinear process mediated by matter that consists in the interaction of either energy-degenerate photons, such as in second-harmonic and third-harmonic generation (THG), or photons with different energies, such as in sum frequency generation (SFG). We recently investigated frequency upconversion in both plasmonic and dielectric nanoantennas [1], [2]. Thanks to the adopted dual-beam pump scheme, where an ultrashort pulse ($omega$) at telecom wavelength ($lambda=1551 text{nm}$) impinges on the sample along with its frequency-doubled replica ($2 omega$), THG and SFG are degenerate in energy. This, along with coherence, enables the interference between the processes. Yet, we found that in individual nanoantennas symmetry plays a major role in enhancing/suppressing the interference between SFG and THG. By tuning the relative phase between the two impinging pulses, we performed all-optical switching of upconverted light with efficiency > 50% in asymmetric plasmonic antennas [2].
将近红外光子的频率上转换为可见范围对信息技术具有战略意义，因为它可以为使用高效硅基探测器读取电信信号提供一种替代方案。光上转换是由物质介导的非线性过程，它既包括能量简并光子的相互作用，如二次谐波和三次谐波产生(THG)，也包括具有不同能量的光子，如和频产生(SFG)。我们最近研究了等离子体和介电纳米天线的频率上变频[1]，[2]。由于采用双光束泵浦方案，其中电信波长($lambda=1551 text{nm}$)的超短脉冲($omega$)与其倍频副本($2 omega$)一起撞击样品，THG和SFG在能量上简并。这与连贯性一起，使进程之间的干扰成为可能。然而，我们发现在单个纳米天线中，对称性在增强/抑制SFG和THG之间的干扰方面起着重要作用。通过调整两个脉冲之间的相对相位，我们实现了效率> 50的上转换光的全光开关% in asymmetric plasmonic antennas [2].
{"title":"All-Optical Steering of Light Upconversion by Nonlinear Metasurfaces Through Coherent Control","authors":"A. Di Francescantonio, A. Zilli, D. Rocco, F. Conti, V. Vinel, A. Borne, M. Morassi, A. Lemaître, P. Biagioni, L. Duò, C. De Angelis, G. Leo, M. Finazzi, M. Celebrano","doi":"10.1109/CLEO/Europe-EQEC57999.2023.10231761","DOIUrl":"https://doi.org/10.1109/CLEO/Europe-EQEC57999.2023.10231761","url":null,"abstract":"Frequency upconversion of near-infrared photons to the visible range is strategical for information technology, as it can provide an alternative for the read out of telecom signals using efficient silicon-based detectors. Light upconversion is a nonlinear process mediated by matter that consists in the interaction of either energy-degenerate photons, such as in second-harmonic and third-harmonic generation (THG), or photons with different energies, such as in sum frequency generation (SFG). We recently investigated frequency upconversion in both plasmonic and dielectric nanoantennas [1], [2]. Thanks to the adopted dual-beam pump scheme, where an ultrashort pulse ($omega$) at telecom wavelength ($lambda=1551 text{nm}$) impinges on the sample along with its frequency-doubled replica ($2 omega$), THG and SFG are degenerate in energy. This, along with coherence, enables the interference between the processes. Yet, we found that in individual nanoantennas symmetry plays a major role in enhancing/suppressing the interference between SFG and THG. By tuning the relative phase between the two impinging pulses, we performed all-optical switching of upconverted light with efficiency > 50% in asymmetric plasmonic antennas [2].","PeriodicalId":19477,"journal":{"name":"Oceans","volume":"23 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76720134","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}
Pub Date : 2023-06-26DOI: 10.1109/CLEO/Europe-EQEC57999.2023.10232594
Tingting Wei, Jingjing Wang, Fengjiao Shen, T. Tan, Z. Cao, Xiaoming Gao, P. Jeseck, Yao-Veng Te, Stéphane Plus, Lei Dong, Weidong Chen
Measurement of vertical concentration profiles of atmospheric trace gases is of great interest to understand the physics, chemistry, dynamics, and radiation budget of the atmosphere as well as to validate the results provided from chemical models and satellite observations. The laser heterodyne radiometer (LHR), as a passive remote sensing technique, was introduced and developed in 1970s to meet the needs of observing O3 hole in the atmosphere [1]–[3]. Since then, due to the lack of a suitable tunable laser source being used as a local oscillator (LO) for heterodyne measurement, LHR applications stayed almost in silence. Over the last decade, there has been a revival of the LHR technique as a result of significant advances in lasers and photonics technology [4]. Compared to the currently used Fourier transform spectrometer (FTS) for ground-based measurement of trace gases in the atmospheric column, the LHR offers unique advantages including high spectral resolution (<10−3 cm−1, determined by the selected electronic filter bandwidths), high sensitivity (within a factor of ~ 2 of the quantum noise limit), high spatial resolution owing to very small coherent field of view (FoV), and cost-effective compact instrumental dimension.
{"title":"Ground-Based Remote Sensing of CO2 in the Atmospheric Column Using a Portable Laser Heterodyne Radiometer with a Balanced Photodetector","authors":"Tingting Wei, Jingjing Wang, Fengjiao Shen, T. Tan, Z. Cao, Xiaoming Gao, P. Jeseck, Yao-Veng Te, Stéphane Plus, Lei Dong, Weidong Chen","doi":"10.1109/CLEO/Europe-EQEC57999.2023.10232594","DOIUrl":"https://doi.org/10.1109/CLEO/Europe-EQEC57999.2023.10232594","url":null,"abstract":"Measurement of vertical concentration profiles of atmospheric trace gases is of great interest to understand the physics, chemistry, dynamics, and radiation budget of the atmosphere as well as to validate the results provided from chemical models and satellite observations. The laser heterodyne radiometer (LHR), as a passive remote sensing technique, was introduced and developed in 1970s to meet the needs of observing O3 hole in the atmosphere [1]–[3]. Since then, due to the lack of a suitable tunable laser source being used as a local oscillator (LO) for heterodyne measurement, LHR applications stayed almost in silence. Over the last decade, there has been a revival of the LHR technique as a result of significant advances in lasers and photonics technology [4]. Compared to the currently used Fourier transform spectrometer (FTS) for ground-based measurement of trace gases in the atmospheric column, the LHR offers unique advantages including high spectral resolution (<10−3 cm−1, determined by the selected electronic filter bandwidths), high sensitivity (within a factor of ~ 2 of the quantum noise limit), high spatial resolution owing to very small coherent field of view (FoV), and cost-effective compact instrumental dimension.","PeriodicalId":19477,"journal":{"name":"Oceans","volume":"356 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77156516","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}
Pub Date : 2023-06-26DOI: 10.1109/CLEO/Europe-EQEC57999.2023.10232214
Suh-young Kwon, Kyungtaek Lee, Taeho Woo, Janghyun Ryu, Junha Jung, Ju Han Lee
Ultrafast fiber lasers have been widely exploited in the field of optical communication, high-harmonic generation, nonlinear microscopy, nanofabrication, and industrial processing [1]. To demonstrate ultrafast fiber lasers, passive mode-locking technique with saturable absorbers (SAs) are commonly used due to high peak power of generated pulse, high beam quality, and efficient heat dissipation. The key elements for high-performance SAs are ultrafast carrier dynamics, large optical nonlinearity, and broadband operating wavelengths of SAs.
{"title":"Passive Mode-Locking of a Fiber Laser Using a V4C3MXene Based saturable Absorber at 1910 nm","authors":"Suh-young Kwon, Kyungtaek Lee, Taeho Woo, Janghyun Ryu, Junha Jung, Ju Han Lee","doi":"10.1109/CLEO/Europe-EQEC57999.2023.10232214","DOIUrl":"https://doi.org/10.1109/CLEO/Europe-EQEC57999.2023.10232214","url":null,"abstract":"Ultrafast fiber lasers have been widely exploited in the field of optical communication, high-harmonic generation, nonlinear microscopy, nanofabrication, and industrial processing [1]. To demonstrate ultrafast fiber lasers, passive mode-locking technique with saturable absorbers (SAs) are commonly used due to high peak power of generated pulse, high beam quality, and efficient heat dissipation. The key elements for high-performance SAs are ultrafast carrier dynamics, large optical nonlinearity, and broadband operating wavelengths of SAs.","PeriodicalId":19477,"journal":{"name":"Oceans","volume":"89 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80919600","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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