scholarly journals Coated High-Refractive-Index Barium Titanate Glass Microspheres for Optically Trapped Microsphere Super-Resolution Microscopy: A Simulation Study

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 84
Author(s):  
Xi Liu ◽  
Song Hu ◽  
Yan Tang
Keyword(s):  
Refractive Index ◽  
Barium Titanate ◽  
Optical Trapping ◽  
Super Resolution ◽  
High Refractive Index ◽  
Trapping Efficiency ◽  
Single Beam ◽  
Imaging Performance ◽  
Super Resolution Microscopy ◽  
Optically Trapped

As water is normally used as the immersion medium in optically trapped microsphere microscopy, the high-refractive-index barium titanate glass (BTG) microsphere shows a better imaging performance than the low-index polystyrene (PS) or melamine formaldehyde (MF) microsphere, but it is difficult to be trapped by single-beam optical trapping due to its overly high refractive index. In this study, coated BTG microspheres with a PS coating have been computationally explored for the combination of optical trapping with microsphere-assisted microscopy. The PS coating thickness affects both the optical trapping efficiency and photonic nanojet (PNJ) property of the coated BTG sphere. Compared to the uncoated BTG sphere, the coated BTG sphere with a proper PS coating thickness has a highly improved trapping efficiency which enables single-beam optical trapping, and a better PNJ with a higher optical intensity Imax and a narrower full width at half maximum (FWHM) corresponding to better imaging performance. These coated BTG spheres also have an advantage in trapping efficiency and imaging performance over conventional PS and MF spheres. The coated BTG microsphere is highly desirable for optically trapped microsphere super-resolution microscopy and potentially beneficial to other research areas, such as nanoparticle detection.

Cellulose derivative/barium titanate composites with high refractive index, conductivity and energy density

Cellulose ◽  
2022 ◽  
Author(s):  
Andreea Irina Barzic ◽  
Marius Soroceanu ◽  
Razvan Rotaru ◽  
Florica Doroftei ◽  
Mihai Asandulesa ◽  
...  
Keyword(s):  
Refractive Index ◽  
Energy Density ◽  
Barium Titanate ◽  
High Refractive Index ◽  
Cellulose Derivative

Prediction of imaging performance of immersion lithography using high refractive index fluid

2008 ◽  
Author(s):  
Takashi Sato ◽  
Masamitsu Itoh ◽  
Akiko Mimotogi ◽  
Shoji Mimotogi ◽  
Kazuya Sato ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Refractive Index ◽  
Immersion Lithography ◽  
Imaging Performance

scholarly journals Synthesis and super-resolution imaging performance of a refractive-index-controllable microsphere superlens

2015 ◽  
Vol 3 (41) ◽  
pp. 10907-10915 ◽  
Author(s):  
Haie Zhu ◽  
Bing Yan ◽  
Shuxue Zhou ◽  
Zengbo Wang ◽  
Limin Wu
Keyword(s):  
Refractive Index ◽  
Super Resolution ◽  
Resolution Imaging ◽  
Imaging Performance

scholarly journals Cellulose Derivative/Barium Titanate Composites with High Refractive Index, Conductivity and Energy Density

2021 ◽  
Author(s):  
Andreea Irina Barzic ◽  
Marius Soroceanu ◽  
Razvan Rotaru ◽  
Florica Doroftei ◽  
Mihai Asandulesa ◽  
...  
Keyword(s):  
Refractive Index ◽  
Barium Titanate ◽  
Composite Films ◽  
Electric Energy ◽  
High Refractive Index ◽  
Ceramic Particle ◽  
Dielectric Studies ◽  
Electric Energy Storage ◽  
Energy Storage Applications ◽  
Particle Addition

Abstract High refractive index and transparent materials are useful in various technical domains, ranging from energy sector to microelectronics. This work deals with polymer composites prepared by embedding small amounts of barium titanate in hydroxypropyl cellulose matrix. Optical transparency of the composite films varies in agreement with polymer doping level. Light dispersion in the prepared composites allowed evaluation of specific parameters, which are related to the sample structural order and possible optical transitions. Conductivity of the composites is increased due to ceramic particle addition in the polymer. Dielectric studies reveal that the prepared materials are suitable for electric energy storage applications.

scholarly journals Germanium nanospheres for ultraresolution picotensiometry of kinesin motors

2020 ◽  
Author(s):  
Swathi Sudhakar ◽  
Mohammad Kazem Abdosamadi ◽  
Tobias Jörg Jachowski ◽  
Michael Bugiel ◽  
Anita Jannasch ◽  
...  
Keyword(s):  
Refractive Index ◽  
Long Range ◽  
Optical Trapping ◽  
Molecular Motion ◽  
Center Of Mass ◽  
High Refractive Index ◽  
Long Range Transport ◽  
Directed Motion ◽  
Range Transport ◽  
Load Conditions

Kinesin motors are essential for transport of cellular cargo along cytoskeletal microtubule filaments. How motors step, detach, and cooperate is still unclear. To dissect the molecular motion of kinesin-1, we have developed germanium nanospheres as ultraresolution optical trapping probes. We found that single motors took 4-nm-center-of-mass steps. Furthermore, motors never detached from microtubules under native hindering load conditions. Instead, motors slid on microtubules with microsecond-long, 8-nm steps and remained in this slip state before detaching or reengaging in directed motion. Surprisingly, reengagement and, thus, rescue of directed motion was prevailing. We argue that teams of motors may be synchronized through this slip state and rescues need to be accounted for to understand long-range transport.One Sentence SummaryOptical trapping of high-refractive-index semiconductor nanoparticles shows how motors detach and walk with 4-nm steps.

scholarly journals Optical Dispersion Characteristics of Polyvinyl Alcohol Reinforced with a Nanoceramic Filler

2020 ◽  
Vol 57 (1) ◽  
pp. 1-7
Author(s):  
Andreea Irina Barzic ◽  
Marius Soroceanu ◽  
Razvan Rotaru ◽  
Valeria Harabagiu ◽  
Romeo Cristian Ciobanu
Keyword(s):  
Refractive Index ◽  
Barium Titanate ◽  
Polyvinyl Alcohol ◽  
Band Gap ◽  
Optical Fibers ◽  
High Refractive Index ◽  
Dispersion Parameters ◽  
Nonlinear Optical Susceptibility ◽  
Optical Dispersion ◽  
Wide Range

Polymer films with high refractive index are suitable for a wide range of applications, such as optical fibers, lens and other components for optoelectronic devices. In this work, polyvinyl alcohol films were prepared from aqueous solutions, which were homogenized by ultrasonication. In order to increase the refractive index, the polymer was reinforced with barium titanate nanoparticles, which are previously ultrasonicated for an adequate dispersion inside the host polymer. The dispersion of the refractive index in visible domain was analyzed as a function of filler percent introduced in polymer, showing that an increase in sample s polarizability determined an increase in the refractive index values. The reinforcement caused a decrease of Abbe number indicating a higher light dispersion in the samples. Optical dispersion parameters were extracted from dispersion curves, revealing a reduction of band gap from 3.448 eV for pure polymer to 2.605 eV for the sample containing 2% barium titanate. Doping with the ceramic nanofiller determined a increase in optical conductivity and real part of dielectric constant as a result of appearance of new level states in the band gap. The increase of third order nonlinear optical susceptibility and nonlinear refractive index indicates the suitability of the analyzed nanocomposites for nonlinear optics applications.

scholarly journals A stable, high refractive index, switching buffer for super-resolution imaging

2018 ◽  
Author(s):  
Tobias M.P. Hartwich ◽  
Kenny Kwok Hin Chung ◽  
Lena Schroeder ◽  
Joerg Bewersdorf ◽  
Christian Soeller ◽  
...  
Keyword(s):  
Refractive Index ◽  
Super Resolution ◽  
High Refractive Index ◽  
Dye Molecules ◽  
Switching Speed ◽  
Dark State ◽  
Oxygen Scavenging ◽  
Index Matching ◽  
Improved Stability ◽  
Resolution Imaging

AbstractdSTORM super-resolution imaging relies on switching buffers to enable dye molecules to enter and exit a metastable dark state. Current buffers have a very limited shelf life of approximately 1 day and poorly match sample refractive index, impacting negatively on measurement reproducibility and image fidelity. We present a buffer based on chemical, rather than enzymatic, oxygen scavenging which exhibits dramatically improved stability, switching speed, contrast, and index matching.

scholarly journals Tunable unidirectional nonlinear emission from transition-metal-dichalcogenide metasurfaces

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Mudassar Nauman ◽  
Jingshi Yan ◽  
Domenico de Ceglia ◽  
Mohsen Rahmani ◽  
Khosro Zangeneh Kamali ◽  
...  
Keyword(s):  
Refractive Index ◽  
Transition Metal ◽  
Second Harmonic ◽  
Nonlinear Crystal ◽  
High Refractive Index ◽  
Great Promise ◽  
Fundamental Wave ◽  
Light Sources ◽  
Transition Metal Dichalcogenide ◽  
Single Beam

AbstractNonlinear light sources are central to a myriad of applications, driving a quest for their miniaturisation down to the nanoscale. In this quest, nonlinear metasurfaces hold a great promise, as they enhance nonlinear effects through their resonant photonic environment and high refractive index, such as in high-index dielectric metasurfaces. However, despite the sub-diffractive operation of dielectric metasurfaces at the fundamental wave, this condition is not fulfilled for the nonlinearly generated harmonic waves, thereby all nonlinear metasurfaces to date emit multiple diffractive beams. Here, we demonstrate the enhanced single-beam second- and third-harmonic generation in a metasurface of crystalline transition-metal-dichalcogenide material, offering the highest refractive index. We show that the interplay between the resonances of the metasurface allows for tuning of the unidirectional second-harmonic radiation in forward or backward direction, not possible in any bulk nonlinear crystal. Our results open new opportunities for metasurface-based nonlinear light-sources, including nonlinear mirrors and entangled-photon generation.

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