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Active Photonic Platforms XIII最新文献

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Non-Hermitian chiral phononics through optomechanical interactions 通过光力学相互作用的非厄米手性声子
Active Photonic Platforms XIII Pub Date : 2021-08-01 DOI: 10.1117/12.2594644
E. Verhagen
{"title":"Non-Hermitian chiral phononics through optomechanical interactions","authors":"E. Verhagen","doi":"10.1117/12.2594644","DOIUrl":"https://doi.org/10.1117/12.2594644","url":null,"abstract":"","PeriodicalId":112265,"journal":{"name":"Active Photonic Platforms XIII","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127622594","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}
引用次数: 0
Flexible ultrathin single-crystalline perovskite photodetector 柔性超薄单晶钙钛矿光电探测器
Active Photonic Platforms XIII Pub Date : 2021-08-01 DOI: 10.1117/12.2593409
Jie He, Hao Jing, Cheng-Yao Li, Renhao Fan, D. Qi, R. Peng, Mu Wang
{"title":"Flexible ultrathin single-crystalline perovskite photodetector","authors":"Jie He, Hao Jing, Cheng-Yao Li, Renhao Fan, D. Qi, R. Peng, Mu Wang","doi":"10.1117/12.2593409","DOIUrl":"https://doi.org/10.1117/12.2593409","url":null,"abstract":"Flexible optoelectronic devices attract considerable attention due to their prominent role in creating novel wearable apparatus for bionics, robotics, health care, and so forth. Although bulk single-crystalline perovskite-based materials are well-recognized for the high photoelectric conversion efficiency than the polycrystalline ones, their stiff and brittle nature unfortunately prohibits their application for flexible devices. Here, we introduce ultrathin single-crystalline perovskite film as the active layer and demonstrate a high-performance flexible photodetector with prevailing bending reliability. With a much reduced thickness of 20 nm, the photodetector made of this ultrathin film can achieve a responsivity much higher than that of recently reported flexible perovskite photodetectors. The demonstrated 0.2 MHz 3 dB bandwidth further paves the way for high-speed photodetection.","PeriodicalId":112265,"journal":{"name":"Active Photonic Platforms XIII","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132781236","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}
引用次数: 0
Excitation enhancement of hot electrons by ultrafast optical pumping in heavily p-doped graphene stacks 高掺磷石墨烯堆中超快光泵浦对热电子的激发增强
Active Photonic Platforms XIII Pub Date : 2021-08-01 DOI: 10.1117/12.2593094
D. Qi, Yingying Zhu, Renhao Fan, R. Peng, Mu Wang
{"title":"Excitation enhancement of hot electrons by ultrafast optical pumping in heavily p-doped graphene stacks","authors":"D. Qi, Yingying Zhu, Renhao Fan, R. Peng, Mu Wang","doi":"10.1117/12.2593094","DOIUrl":"https://doi.org/10.1117/12.2593094","url":null,"abstract":"In this work, we intentionally explored the heavily p-doped graphene stacks by degenerate femtosecond pump-probe spectroscopy, and observed an excitation enhancement of hot electrons at weak pump fluence. Physically, both Auger processes and population inversion are suppressed in this system, yet it becomes possible for the conduction bands to be effectively evacuated within the pulse duration through the ultrafast cooling of hot electrons, which may lead to an enhanced excitation of hot electrons. This excitation enhancement can be further strengthened by multiple layer-stacking processes or a thermal annealing pretreatment. Furthermore, large modulation depth is achieved in graphene stacks with small variation of pump fluence. We suggest that this effect can have potential applications on harvesting energy from excited hot electrons, and may provide a unique way to achieve high-speed modulators, photodetectors, solar cells, and photocatalysts.","PeriodicalId":112265,"journal":{"name":"Active Photonic Platforms XIII","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133654298","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}
引用次数: 0
Tunable chiral properties of J-aggregates j -聚集体的可调手性
Active Photonic Platforms XIII Pub Date : 2021-08-01 DOI: 10.1117/12.2594624
Carla Otero-Martínez, Pablo Hervés-Beloso, S. Núñez-Sánchez
{"title":"Tunable chiral properties of J-aggregates","authors":"Carla Otero-Martínez, Pablo Hervés-Beloso, S. Núñez-Sánchez","doi":"10.1117/12.2594624","DOIUrl":"https://doi.org/10.1117/12.2594624","url":null,"abstract":"J-aggregates are supramolecular structures with great potential as building blocks made of organic materials for subwavelength confinement. Their extraordinary properties are related to the delocalisation of excitons between the monomers. It is possible to modify the arrangements of monomers by hydrodynamic forces obtaining a strong circular dichroism signal. In this work, we study how to tune this induced circular dichroism response as a function of the stirring velocity and the ionic strength of the dispersion media for a large variety of J-aggregates. The final aim of this work is to reflect the potential use of this chiral J-aggregates as building blocks for fluorescent tunable chiral-nanoprobes.","PeriodicalId":112265,"journal":{"name":"Active Photonic Platforms XIII","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114497052","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}
引用次数: 0
Homogenisation theory of space-time metamaterials: how synthetic motion drags light at low frequencies 时空超材料的均质化理论:合成运动如何在低频率下拖光
Active Photonic Platforms XIII Pub Date : 2021-08-01 DOI: 10.1117/12.2594111
P. Huidobro, M. Silveirinha, E. Galiffi, J. Pendry
{"title":"Homogenisation theory of space-time metamaterials: how synthetic motion drags light at low frequencies","authors":"P. Huidobro, M. Silveirinha, E. Galiffi, J. Pendry","doi":"10.1117/12.2594111","DOIUrl":"https://doi.org/10.1117/12.2594111","url":null,"abstract":"Recently, time has emerged as a new degree of freedom for metamaterials, as variations of the electromagnetic parameters in time as well as in space allow for new pathways in wave control. In these time-dependent systems, energy is not necessarily conserved, and the linear bias imposed by travelling wave modulations permits non-reciprocal effects in the absence of external magnetic fields. I will present a theory of homogenisation of space-time metamaterials, which provides analytical expressions for the effective permittivity, permeability and magnetoelectric coupling in the long wavelength limit. From the derived parameters I will show how it is possible to bring nonreciprocity down to zero frequency if both the permittivity and permeability are modulated, and how the synthetic motion present in these systems enables a Fresnel drag effect of light without moving matter. Thus, giant magnetoelectric effects emerge without external magnetic biases or relativistically moving matter.","PeriodicalId":112265,"journal":{"name":"Active Photonic Platforms XIII","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124403527","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}
引用次数: 0
Bendable disordered metamaterials for broadband terahertz invisibility 用于宽带太赫兹隐身的可弯曲无序超材料
Active Photonic Platforms XIII Pub Date : 2021-08-01 DOI: 10.1117/12.2593406
Renhao Fan, R. Peng, Dong Liu, Mu Wang
{"title":"Bendable disordered metamaterials for broadband terahertz invisibility","authors":"Renhao Fan, R. Peng, Dong Liu, Mu Wang","doi":"10.1117/12.2593406","DOIUrl":"https://doi.org/10.1117/12.2593406","url":null,"abstract":"Here, we experimentally demonstrate a bendable cloaking structure composed of obliquely stacked planar metallic shells that individually enclose the objects to be hidden. The ensemble of shells acts as a disordered oblique grating that can be bent to form a curved structure; this bendable cloaking structure exhibits broadband invisibility from 0.2 to 1.0 THz, and the curved cloaking structure is functionally effective for incident angles ranging from -10° to 30°. A wide range of practical applications exists that would require hiding cloaked objects with sizes of the order of hundreds of microns, which are smaller than the sizes of the metal shells. In principle, similar cloaking effects can be achieved for a broad bandwidth of frequencies ranging from infrared to radio waves.","PeriodicalId":112265,"journal":{"name":"Active Photonic Platforms XIII","volume":"172 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116409525","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}
引用次数: 0
Direct quantification of robustness in topologically-protected photonic edge states at telecom wavelengths 电信波长下拓扑保护光子边缘态鲁棒性的直接量化
Active Photonic Platforms XIII Pub Date : 2021-08-01 DOI: 10.1117/12.2594527
S. Arora, T. Bauer, R. Barczyk, E. Verhagen, L. Kuipers
{"title":"Direct quantification of robustness in topologically-protected photonic edge states at telecom wavelengths","authors":"S. Arora, T. Bauer, R. Barczyk, E. Verhagen, L. Kuipers","doi":"10.1117/12.2594527","DOIUrl":"https://doi.org/10.1117/12.2594527","url":null,"abstract":"Topologically tailored photonic crystals offer robust transport of optical states in quantum and classical systems. However, quantifying the robustness of edge states in topologically protected PhCs has remained elusive. In our recent work, we report a rigorous quantitative evaluation of topological photonic edge eigenstates, emulating the quantum valley Hall effect (VPC), and analyze their transport properties in the telecom wavelength range using a phase-resolved near-field optical microscope. Our results demonstrate that the backscattering energy ratio for the VPC is two orders of magnitude smaller compared to that in a conventional W1 waveguide. Such an evaluation opens a pathway for creating quantum photonic networks that can achieve secure and robust communications.","PeriodicalId":112265,"journal":{"name":"Active Photonic Platforms XIII","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127652307","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}
引用次数: 0
Strong mid-Infrared photoresponse in twisted bilayer graphene 扭曲双层石墨烯的强中红外光响应
Active Photonic Platforms XIII Pub Date : 2021-08-01 DOI: 10.1117/12.2593067
F. Xia
{"title":"Strong mid-Infrared photoresponse in twisted bilayer graphene","authors":"F. Xia","doi":"10.1117/12.2593067","DOIUrl":"https://doi.org/10.1117/12.2593067","url":null,"abstract":"Twisted bilayer graphene has recently been extensively investigated due to its unusual physical properties. In this talk, we will discuss its infrared optical properties and its potential in mid-infrared light detection. We first show that the folding of the Brillouin zone leads to enhanced density of states and strong mid-infrared light absorption, which are tunable by the twist angle. Furthermore, we reveal the significance of the formation of superlattice bandgap. Strong mid-infrared photoresponse is observed when the Fermi-level is within the superlattice bandgap. On the contrary, when the superlattice bandgap is vanished, the photoresponse is minimized. Our demonstration provides an alternative pathway towards the realization of high performance mid-infrared photodetectors.","PeriodicalId":112265,"journal":{"name":"Active Photonic Platforms XIII","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128792670","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}
引用次数: 0
Near- and far-field response of periodic arrays of nanoparticles 纳米粒子周期阵列的近场和远场响应
Active Photonic Platforms XIII Pub Date : 2021-08-01 DOI: 10.1117/12.2593972
A. Manjavacas
{"title":"Near- and far-field response of periodic arrays of nanoparticles","authors":"A. Manjavacas","doi":"10.1117/12.2593972","DOIUrl":"https://doi.org/10.1117/12.2593972","url":null,"abstract":"","PeriodicalId":112265,"journal":{"name":"Active Photonic Platforms XIII","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121475884","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}
引用次数: 0
Low refractive cladding in III-nitride photonics iii -氮化物光子中的低折射率包层
Active Photonic Platforms XIII Pub Date : 2021-07-01 DOI: 10.1117/12.2596419
G. Subramania, N. Karl, K. Sapkota, George T. Wang, I. Brener, Zachary Meinelt, D. Feezell
{"title":"Low refractive cladding in III-nitride photonics","authors":"G. Subramania, N. Karl, K. Sapkota, George T. Wang, I. Brener, Zachary Meinelt, D. Feezell","doi":"10.1117/12.2596419","DOIUrl":"https://doi.org/10.1117/12.2596419","url":null,"abstract":"III-Nitride based photonic crystals or metamaterials can operate in the visible and ultraviolet frequencies and are important for many nanophotonics applications. A key challenge in efficient operation of such III-nitride based optical nanostructures has been in creating a low refractive index interface cladding region between the high refractive index substrate GaN and the active layer due to a lack of compatible natural low index materials unlike those in Si and III-V systems. Here we will discuss achieving such optical substrate isolation in III-nitride nanophotonic devices using electrochemical and photo-electrochemical etching techniques [Opt. Mat. Exp. 2018, 8, 3543]. We will describe the fabrication of a GaN nanowire array utilizing this method of optical isolation and present the optical response to demonstrate the effectiveness of this approach. \u0000 \u0000Sandia National Laboratories is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.","PeriodicalId":112265,"journal":{"name":"Active Photonic Platforms XIII","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124329092","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}
引用次数: 0
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