scholarly journals Deep Subwavelength-Scale Light Focusing and Confinement in Nanohole-Structured Mesoscale Dielectric Spheres

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 186 ◽  
Author(s):  
Yinghui Cao ◽  
Zhenyu Liu ◽  
Oleg Minin ◽  
Igor Minin
Keyword(s):  
Optical Materials ◽  
Super Resolution ◽  
Optical Tweezer ◽  
Diffraction Imaging ◽  
Enhanced Raman Scattering ◽  
Dielectric Spheres ◽  
Field Localization ◽  
Surface Fabrication ◽  
First Time ◽  
Localization Region

One of the most captivating properties of dielectric mesoscale particles is their ability to form a sub-diffraction limited-field localization region, near their shadow surfaces. However, the transverse size of the field localization region of a dielectric mesoscale particle is usually larger than λ/3. In this present paper, for the first time, we present numerical simulations to demonstrate that the size of the electromagnetic field that forms in the localized region of the dielectric mesoscale sphere can be significantly reduced by introducing a nanohole structure at its shadow surface, which improves the spatial resolution up to λ/40 and beyond the solid immersion diffraction limit of λ/2n. The proposed nanohole-structured microparticles can be made from common natural optical materials, such as glass, and are important for advancing the particle-lens-based super-resolution technologies, including sub-diffraction imaging, interferometry, surface fabrication, enhanced Raman scattering, nanoparticles synthesis, optical tweezer, etc.

scholarly journals Super-Resolution Optical Imaging: Plasmonic Nanoprobes for Multiplexed Fluorescence-Free Super-Resolution Imaging (Advanced Optical Materials 20/2018)

2018 ◽  
Vol 6 (20) ◽  
pp. 1870077
Author(s):  
Jian Xu ◽  
Tianyue Zhang ◽  
Shenyu Yang ◽  
Ziwei Feng ◽  
Haoying Li ◽  
...  
Keyword(s):  
Optical Imaging ◽  
Optical Materials ◽  
Super Resolution ◽  
Resolution Imaging

Surface-enhanced Raman scattering on organic–inorganic hybrid perovskites

2018 ◽  
Vol 54 (17) ◽  
pp. 2134-2137 ◽  
Author(s):  
Xiaoyue Su ◽  
Hao Ma ◽  
He Wang ◽  
Xueliang Li ◽  
Xiao Xia Han ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Inorganic Hybrid ◽  
Enhancement Mechanism ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
First Time

For the first time SERS on organic–inorganic hybrid perovskites is explored. The enhancement mechanism is discussed according to charge transfer.

scholarly journals Light Concentration by Metal-Dielectric Micro-Resonators for SERS Sensing

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 103 ◽  
Author(s):  
Andrey Sarychev ◽  
Andrey Ivanov ◽  
Andrey Lagarkov ◽  
Grégory Barbillon
Keyword(s):  
Quantum Electrodynamics ◽  
Near Infrared ◽  
Super Resolution ◽  
Optical Filters ◽  
Energy Concentration ◽  
Plasmonic Structures ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Super Resolution Microscopy ◽  
Sers Sensing

Metal-dielectric micro/nano-composites have surface plasmon resonances in visible and near-infrared domains. Excitation of coupled metal-dielectric resonances is also important. These different resonances can allow enhancement of the electromagnetic field at a subwavelength scale. Hybrid plasmonic structures act as optical antennae by concentrating large electromagnetic energy in micro- and nano-scales. Plasmonic structures are proposed for various applications such as optical filters, investigation of quantum electrodynamics effects, solar energy concentration, magnetic recording, nanolasing, medical imaging and biodetection, surface-enhanced Raman scattering (SERS), and optical super-resolution microscopy. We present the review of recent achievements in experimental and theoretical studies of metal-dielectric micro and nano antennae that are important for fundamental and applied research. The main impact is application of metal-dielectric optical antennae for the efficient SERS sensing.

scholarly journals Development of the Morphology and the Band Gap Energy of Co–Si Nanofibers by Inserting Zirconium and Titanium with Dual Anions Intercalation Process

2019 ◽  
Vol 9 (22) ◽  
pp. 4775 ◽  
Author(s):  
Osama Saber ◽  
Nagih M. Shaalan ◽  
Aya Osama ◽  
Adil Alshoaibi
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Optical Materials ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Intercalation Process ◽  
Trivalent Cations ◽  
Optical Applications ◽  
Double Hydroxides ◽  
First Time

The plate-like structure is the most familiar morphology for conventional layered double hydroxides (LDHs) in case their structures consist of divalent and trivalent cations in their layers. In this study, nanofibers and nanoneedles of Co–Si LDHs were prepared for the first time. By the inclusion of zirconium inside the nanolayers of LDH structures, their plates were formed and transformed to nanofibers. These nanofibers were modified by the insertion of titanium to build again plate-like morphology for the LDH structure. This morphology controlling was studied and explained by a dual anions intercalation process. The optical properties of Co–Si LDHs indicated that the incorporation of zirconium within their nanolayers decreased the band gap energy from 4.4 eV to 2.9 eV. Following the same behavior, the insertion of titanium besides zirconium within the nanolayers of Co–Si LDHs caused a further reduction in the band gap energy, which became 2.85 eV. Although there is no data for the optical properties of Co–Si LDHs in the literature, it is interesting to observe the low band gap energy for Co–Si LDHs to become more suitable for optical applications. These results concluded that the reduction of the band gap energy and the formation of nanofibers introduce new optical materials for developing and designing optical nanodevices.

A surface-enhanced Raman scattering active core/shell structure based on enzyme-guided crystal growth for bisphenol A detection

2018 ◽  
Vol 10 (31) ◽  
pp. 3878-3883 ◽  
Author(s):  
Zhou Xu ◽  
Rong Wang ◽  
Bo Mei ◽  
Li Ding ◽  
Libing Wang ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Active Core ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering ◽  
Bisphenol A Detection ◽  
First Time

Herein, a universal surface-enhanced Raman scattering (SERS) detection platform based on enzyme-guided crystal growth has been fabricated for the first time.

scholarly journals Demonstration of nanoimprinted hyperlens array for high-throughput sub-diffraction imaging

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Minseop Byun ◽  
Dasol Lee ◽  
Minkyung Kim ◽  
Yangdoo Kim ◽  
Kwan Kim ◽  
...  
Keyword(s):  
Real Time ◽  
Large Scale ◽  
Medical Science ◽  
Super Resolution ◽  
Fabrication Process ◽  
Far Field ◽  
Resolution Limit ◽  
Imaging Science ◽  
Diffraction Imaging ◽  
Resolution Imaging

Abstract Overcoming the resolution limit of conventional optics is regarded as the most important issue in optical imaging science and technology. Although hyperlenses, super-resolution imaging devices based on highly anisotropic dispersion relations that allow the access of high-wavevector components, have recently achieved far-field sub-diffraction imaging in real-time, the previously demonstrated devices have suffered from the extreme difficulties of both the fabrication process and the non-artificial objects placement. This results in restrictions on the practical applications of the hyperlens devices. While implementing large-scale hyperlens arrays in conventional microscopy is desirable to solve such issues, it has not been feasible to fabricate such large-scale hyperlens array with the previously used nanofabrication methods. Here, we suggest a scalable and reliable fabrication process of a large-scale hyperlens device based on direct pattern transfer techniques. We fabricate a 5 cm × 5 cm size hyperlenses array and experimentally demonstrate that it can resolve sub-diffraction features down to 160 nm under 410 nm wavelength visible light. The array-based hyperlens device will provide a simple solution for much more practical far-field and real-time super-resolution imaging which can be widely used in optics, biology, medical science, nanotechnology and other closely related interdisciplinary fields.

scholarly journals TDP-43 proteinopathy impairs neuronal mRNP granule mediated postsynaptic local translation and mRNA metabolism

2019 ◽  
Author(s):  
Chia-En Wong ◽  
Kuen-Jer Tsai
Keyword(s):  
Imaging Techniques ◽  
Super Resolution ◽  
Protein Translation ◽  
Local Protein Synthesis ◽  
Mrna Metabolism ◽  
Molecular Approaches ◽  
Super Resolution Microscopy ◽  
First Time ◽  
Activity Dependent ◽  
Local Protein

AbstractLocal protein synthesis and mRNA metabolism mediated by mRNP granules in the dendrites and the postsynaptic compartments is essential for synaptic remodelling and plasticity in the neuronal cells. Misregulation in these processes caused by TDP-43 proteinopathy lead to neurodegenerative diseases such frontotemporal lobar degeneration (FTLD) and amyotrophic lateral sclerosis (ALS). Using biochemical analysis and imaging techniques including super-resolution microscopy, we provide evidences for the first time of the postsynaptic localization of TDP-43 in the mammalian synapses; and we show TDP-43 as a component of neuronal mRNP granules. With activity stimulation and different molecular approaches, we further demonstrate activity-dependent mRNP granule dynamics involving disassembly of mRNP granules, release of mRNAs, and activation of local protein translation as long as impairments in models of TDP-43 proteinopathy. This study elucidates the interplay between TDP-43 and neuronal mRNP granules in normal physiology and TDP-43 proteinopathy in regulation of local protein translation and mRNA metabolism in the postsynaptic compartment.

Photon avalanche in lanthanide doped nanoparticles for biomedical applications: super-resolution imaging

2019 ◽  
Vol 4 (4) ◽  
pp. 881-889 ◽  
Author(s):  
Artur Bednarkiewicz ◽  
Emory M. Chan ◽  
Agata Kotulska ◽  
Lukasz Marciniak ◽  
Katarzyna Prorok
Keyword(s):  
Biomedical Applications ◽  
Super Resolution ◽  
Diffraction Imaging ◽  
Resolution Imaging

Photon avalanche in lanthanide doped nanoparticles shows exceptional properties, potentially suitable for single photoexcitation beam sub-diffraction imaging.

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