Life Beyond Diffraction: Opening New Routes to Materials Characterization with Next-Generation Optical Near-Field Approaches

2013 ◽  
Vol 23 (20) ◽  
pp. 2539-2553 ◽  
Author(s):  
P. James Schuck ◽  
Alexander Weber-Bargioni ◽  
Paul D. Ashby ◽  
D. Frank Ogletree ◽  
Adam Schwartzberg ◽  
...  
Keyword(s):  
Near Field ◽  
Materials Characterization ◽  
Next Generation ◽  
Field Approaches

Next Generation of Soil-Structure Interaction Models for Design of Nuclear Power Plants

2014 ◽  
Vol 9 (1) ◽  
pp. 3-16 ◽  
Author(s):  
Alexander G. Tyapin ◽  
Keyword(s):  
Time Domain ◽  
Soil Structure ◽  
Power Plants ◽  
Near Field ◽  
Soil Structure Interaction ◽  
Current Status ◽  
Computational Techniques ◽  
Next Generation ◽  
Structure Interaction ◽  
Wave Effects

The author here shares his vision of next-generation models for seismic soil-structure interaction (SSI) analysis. These models should combine reasonable considerations of wave effects in half-infinite soil with a correct representation of nonlinearity in the structure, and in both the so-called near field, i.e., in that part of soil near a base mat, and in the soil-structure contact surface. The far field, i.e., all of the soil except for the near field, is treated as a linear horizontally layered medium, as is currently done in the well-known program SASSI. The importance of considering nonlinear effects even in very stiff structures like NPPs was shown by the March 2011 Great East Japan Earthquake that hit northeastern Japan’s Pacific coast. Although the idea of calculating SSI wave effects in the time domain has been around for several decades ago, current NPP design practices are linear. Next-generation SSI models should enable practical time-domain analysis. The author suggests a road map – the sequence of problems to be solved to achieve a proposed level. Some of these problems have already been solved, at least in principle, but other solutions are yet to be found. The author describes the current status of his research and ideas about implementing modern computational techniques such as parallel computation.

scholarly journals Giant optical anisotropy in transition metal dichalcogenides for next-generation photonics

2020 ◽  
Author(s):  
Georgy Ermolaev ◽  
D. Grudinin ◽  
Y. Stebunov ◽  
K. Voronin ◽  
Vasyl Kravets ◽  
...  
Keyword(s):  
Transition Metal ◽  
Optical Anisotropy ◽  
Near Infrared ◽  
Near Field ◽  
Transition Metal Dichalcogenides ◽  
Next Generation ◽  
Infrared Wavelength ◽  
Infrared Spectral ◽  
Metal Dichalcogenides ◽  
On Chip

Abstract Large optical anisotropy observed in a broad spectral range is of paramount importance for efficient light manipulation in countless devices. Although a giant anisotropy was recently observed in the mid-infrared wavelength range, for visible and near-infrared spectral intervals, the problem remains acute with the highest reported birefringence values of 0.8 in BaTiS3 and h-BN crystals. This inspired an intensive search for giant optical anisotropy among natural and artificial materials. Here, we demonstrate that layered transition metal dichalcogenides (TMDCs) provide an answer to this quest owing to their fundamental differences between intralayer strong covalent bonding and weak interlayer van der Walls interaction. To do this, we carried out a correlative far- and near-field characterization validated by first-principle calculations that reveals an unprecedented birefringence of 1.5 in the infrared and 3 in the visible light for MoS2. Our findings demonstrate that this outstanding anisotropy allows for tackling the diffraction limit enabling an avenue for on-chip next-generation photonics.

Adaptive Regulation of Tracking Servo for Next Generation Optical Data Storage Systems

2012 ◽  
Vol 236-237 ◽  
pp. 497-502
Author(s):  
Fei Peng ◽  
Zhi Zheng Wu ◽  
Lu Wang
Keyword(s):  
Data Storage ◽  
Data Transfer ◽  
Storage Systems ◽  
Near Field ◽  
Tracking Error ◽  
Optical Data Storage ◽  
Optical Data ◽  
Next Generation ◽  
Adaptive Regulation ◽  
Control Approach

The tracking servo control has played an important role in the data storage servo systems. In the next generation optical data storage systems, i.e. the near-field recording system, the tracking error of the servo system should be below 10 nanometers under various unknown situations. However, higher data transfer rate and higher data density make it difficult to maintain the desired tracking precision during normal disk operation. It is proposed in this paper to use an adaptive regulation approach to maintain the tracking error below its desired value, despite unknown track eccentricity and external force disturbance. The performance of the proposed control approach is analyzed and simulation results are presented to illustrate the capability of the proposed adaptive regulator to achieve and maintain the desired tracking precision.

scholarly journals Giant optical anisotropy in transition metal dichalcogenides for next-generation photonics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
G. A. Ermolaev ◽  
D. V. Grudinin ◽  
Y. V. Stebunov ◽  
K. V. Voronin ◽  
V. G. Kravets ◽  
...  
Keyword(s):  
Transition Metal ◽  
Optical Anisotropy ◽  
Near Infrared ◽  
Near Field ◽  
Transition Metal Dichalcogenides ◽  
Next Generation ◽  
Infrared Wavelength ◽  
Infrared Spectral ◽  
Metal Dichalcogenides ◽  
On Chip

AbstractLarge optical anisotropy observed in a broad spectral range is of paramount importance for efficient light manipulation in countless devices. Although a giant anisotropy has been recently observed in the mid-infrared wavelength range, for visible and near-infrared spectral intervals, the problem remains acute with the highest reported birefringence values of 0.8 in BaTiS3 and h-BN crystals. This issue inspired an intensive search for giant optical anisotropy among natural and artificial materials. Here, we demonstrate that layered transition metal dichalcogenides (TMDCs) provide an answer to this quest owing to their fundamental differences between intralayer strong covalent bonding and weak interlayer van der Waals interaction. To do this, we made correlative far- and near-field characterizations validated by first-principle calculations that reveal a huge birefringence of 1.5 in the infrared and 3 in the visible light for MoS2. Our findings demonstrate that this remarkable anisotropy allows for tackling the diffraction limit enabling an avenue for on-chip next-generation photonics.

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