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Asian journal of physics : an international quarterly research journal最新文献

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Higher order photonic stop-bands and random lasing in microflower decorated polystyrene opals 微花装饰聚苯乙烯蛋白石中的高阶光子阻带和随机激光
Pub Date : 2021-06-30 DOI: 10.54955/ajp.30.6.2021.863-870
N. Ojha, A. Sarkar, B. Bhaktha
Mono-sized polystyrene nanoparticles of different diameters were synthesized using emulsion polymerization process. Consequently, highly ordered 3-D photonic crystals (opals) of polystyrene nanoparticles were fabricated by evaporation assisted sedimentation deposition technique. The opal structures were found to exhibit very intense higher order photonic stop-bands (PSBs) along with the fundamental PSB. Numerically computed band diagram of polystyrene opal endorses the higher order energy bands in the experimental reflection spectra and the existence of Van Hove singularity. Also, on coating the opal structure with a 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM) doped polyvinyl alcohol (PVA) thin film (DCM-PVA) active layer, random lasing (RL) was observed. © Anita Publications. All rights reserved.
采用乳液聚合法制备了不同粒径的单粒径聚苯乙烯纳米颗粒。因此,利用蒸发辅助沉积技术制备了聚苯乙烯纳米颗粒高度有序的三维光子晶体(蛋白石)。发现蛋白石结构表现出非常强的高阶光子禁带(PSB)以及基本的PSB。数值计算的聚苯乙烯蛋白石能带图证实了实验反射光谱中的高阶能带和Van Hove奇点的存在。此外,在蛋白石结构上涂覆4-(二氰乙烯)-2-甲基-6-(4-二甲氨基苯基)- 4h -吡喃(DCM)掺杂聚乙烯醇(PVA)薄膜(DCM-PVA)活性层,观察到随机激光(RL)。©Anita Publications。版权所有。
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引用次数: 0
Transverse optical current in off-axis vortex beams 离轴涡旋光束中的横向光电流
Pub Date : 2021-06-30 DOI: 10.54955/ajp.30.6.2021.899-906
Satyajit Maji, M. Brundavanam
Optical beams nesting single or more off-axial distribution of point vortices is considered. The effective topological charge carried out by the beam is explored when the beam is nesting a fractional order vortex phase, beam containing an arbitrary distribution of point vortices as well as when two or more integer order vortex fields are superposed. The orbital angular momentum (OAM) carried out by this beam is generally a fractional number when average OAM per photon is considered. Depending on the distribution of the point vortices the beam may carry a net transverse linear momentum which dictates the nature of the OAM carried out by the beams. When more than one off-axis vortex is present within the beam, the transverse Poynting vector also exhibits saddle points which reveal intricate topological structure of such optical vortex beams. © Anita Publications. All rights reserved.
考虑了光束嵌套时单点或多点离轴涡分布。研究了当光束嵌套分数阶涡相、光束包含任意分布的点涡以及两个或多个整数阶涡场叠加时,光束所产生的有效拓扑电荷。当考虑每个光子的平均轨道角动量时,该光束所产生的轨道角动量通常是一个分数。根据点涡的分布,光束可能携带一个净横向线性动量,这决定了光束所进行的OAM的性质。当光束中存在多个离轴涡旋时,横向坡印亭矢量也会出现鞍点,鞍点揭示了这种光学涡旋光束的复杂拓扑结构。©Anita Publications。版权所有。
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引用次数: 0
Multi-photon absorption properties of semiconducting nanomaterials 半导体纳米材料的多光子吸收特性
Pub Date : 2021-06-30 DOI: 10.54955/AJP.30.6.2021.907-916
V. Nalla
Multiphoton absorption (MPA) is a nonlinear optical process that involves simultaneous absorption of two or more photons by a material to promote its ground state to an excited state. Multiphoton absorption promises many important applications such as multi-dimensional fluorescence imaging, three dimensional (3D) data storage. Physical and chemical properties of nanometer sized semiconductor materials change drastically due to quantum size effect. Combination of both multiphoton absorption and quantum effects will be an interesting study. Multiphoton absorption of semiconducting nanomaterials is an exciting phenomenon which promotes many important applications. This paper reviews multi-photon absorption properties of different kinds of semiconducting nanomaterials starting from chalcogenide-based nanomaterials to perovskites nanomaterials and their applications in various fields. © Anita Publications. All rights reserved.
多光子吸收(MPA)是一种非线性光学过程,涉及到材料同时吸收两个或两个以上的光子,将其基态提升到激发态。多光子吸收有许多重要的应用前景,如多维荧光成像,三维(3D)数据存储。由于量子尺寸效应,纳米半导体材料的物理和化学性质发生了巨大的变化。多光子吸收和量子效应的结合将是一个有趣的研究。半导体纳米材料的多光子吸收是一个令人兴奋的现象,它促进了许多重要的应用。本文综述了从硫族化合物纳米材料到钙钛矿纳米材料等不同类型半导体纳米材料的多光子吸收特性及其在各个领域的应用。©Anita Publications。版权所有。
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引用次数: 0
Coherent plasmonic absorption in the femtosecond regime 飞秒体制中的相干等离子体吸收
Pub Date : 2021-04-05 DOI: 10.54955/AJP.30.6.2021.889-898
V. Nalla, X. Fang, J. Valente, Handong Sun, N. Zheludev
Dissipation of electromagnetic energy through absorption is a fundamental process that underpins phenomena ranging from photovoltaics to photography, analytical spectroscopy, photosynthesis, and human vision. Absorption is also a dynamic process that depends on the duration of the optical illumination. Here, we report on the resonant plasmonic absorption of a nanostructured metamaterial and the non-resonant absorption of an unstructured gold film at different optical pulse durations. By examining the absorption in travelling and standing waves, we observe a plasmonic relaxation time of 11 fs as the characteristic transition time. The metamaterial acts as a beam-splitter with low absorption for shorter pulses, while as a good absorber for longer pulses. The transient nature of the absorption puts a frequency limit of ~90 THz on the bandwidth of coherently-controlled, all-optical switching devices, which is still a thousand times faster than other leading switching technologies. © Anita Publications. All rights reserved.
通过吸收的电磁能量耗散是一个基本的过程,它支撑着从光伏到摄影、分析光谱学、光合作用和人类视觉等各种现象。吸收也是一个动态过程,它取决于光学照明的持续时间。本文报道了纳米结构超材料在不同光脉冲持续时间下的共振等离子体吸收和非结构金膜的非共振吸收。通过研究行波和驻波的吸收,我们观察到等离子体弛豫时间为11 fs作为特征跃迁时间。该超材料作为分束器,对较短脉冲吸收较低,而对较长脉冲吸收较好。吸收的瞬态特性使相干控制全光开关器件的带宽限制在~90太赫兹,这仍然比其他领先的开关技术快1000倍。©Anita Publications。版权所有。
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引用次数: 0
DFT Study on tautomerism of cytosine and its 5-haloderivatives: A Review* 胞嘧啶及其5-卤代衍生物互变异构的DFT研究进展*
Pub Date : 2021-03-01 DOI: 10.54955/ajp.30.3.2021.521-536
M. Alcolea Palafox, W. Kiefer, Kaushal Rani, B. Lal, J. K. Vats, Sudheer Kumar Singh, V. Rastogi
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引用次数: 0
Resolving power of optical instruments: A Tutorial 光学仪器的分辨能力:教程
Pub Date : 2021-01-01 DOI: 10.54955/ajp.30.1.2021.31-43
Rajpal Singh Sirohi
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引用次数: 0
Multi-pass, multi-beam and multi-wavelength optical interferometries 多通、多光束、多波长光学干涉测量
Pub Date : 2019-12-01 DOI: 10.54955/ajp.28.10-12.2019.1091-1102
Rajpal Singh Sirohi
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引用次数: 0
Shades and Ref lections of Light 光的阴影和反射
Pub Date : 2019-05-01 DOI: 10.54955/ajp.28.5.2019.309-317
Rajpal Singh Sirohi
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引用次数: 0
On the algorithms in phase-shift interferometry
Pub Date : 2019-05-01 DOI: 10.54955/ajp.28.5.2019.275-283
Rajpal Singh Sirohi
{"title":"On the algorithms in phase-shift interferometry","authors":"Rajpal Singh Sirohi","doi":"10.54955/ajp.28.5.2019.275-283","DOIUrl":"https://doi.org/10.54955/ajp.28.5.2019.275-283","url":null,"abstract":"","PeriodicalId":90793,"journal":{"name":"Asian journal of physics : an international quarterly research journal","volume":"104 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87596497","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
Molecular structure and vibrational spectra of 2-thiouracil: A comparison with uracil 2-硫脲嘧啶的分子结构和振动光谱:与尿嘧啶的比较
Pub Date : 2017-12-01 DOI: 10.54955/ajp.26.11-12.2017.365-373
Kaushal Rani, J. Prakash, Sudheer Kumar Singh, J. K. Vats, M. Palafox, V. Rastogi
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引用次数: 0
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Asian journal of physics : an international quarterly research journal
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