scholarly journals Ultra-broad band perfect absorption realized by phonon–photon resonance in periodic polar dielectric material based pyramid structure

2020 ◽  
Vol 477 ◽  
pp. 126337
Author(s):  
Kaidi Xu ◽  
Gaige Zheng
Keyword(s):  
Dielectric Material ◽  
Broad Band ◽  
Perfect Absorption ◽  
Polar Dielectric ◽  
Pyramid Structure ◽  
Photon Resonance

Low Temperature Curing - Aqueous Base Developable Photoimageable Dielectric for WLP (Wafer Level Packaging)

2012 ◽  
Vol 2012 (DPC) ◽  
pp. 000986-001015
Author(s):  
Eric Huenger ◽  
Joe Lachowski ◽  
Greg Prokopowicz ◽  
Ray Thibault ◽  
Michael Gallagher ◽  
...  
Keyword(s):  
Low Temperature ◽  
Dielectric Material ◽  
Broad Band ◽  
Dielectric Materials ◽  
Next Generation ◽  
Wafer Level ◽  
Moore’S Law ◽  
Moore's Law ◽  
3D Chip Stacking ◽  
The Impact

As advanced packaging application space evolves and continues to deviate from the conventional shrinkage pathway predicted by Moore's law, material suppliers need to continue to work with OEMs, OSATs and Foundries to identify specific opportunities. One such opportunity continues to present itself in developing new materials to support new platforms for next generation products to support 3D chip stacking and TSV applications. The newer material sets can be established to meet more challenging design requirements associated with the demands, presented by the application from both a physical/lithographical processing and design perspective. Next generation packages requires the development of new dielectric materials that can support both the physical demands of 3D chip stacking and TSV package design aspects while maintaining strengths of the existing material platform. While vertical integration necessitates the use of thinned substrates and its associated integration challenges, there is a continuing need to support horizontal shrinkage typical of the Moore's Law, which pushes the lithography envelope requiring finer pitch and smaller feature resolution capability. This presentation identifies the strategy we have taken and highlights approach taking in the development of low temperature curable photoimageable dielectric materials with enhanced lithographic performance. We will discuss the methodology used to create benzocyclobutene based dielectric material curable at 180 °C and show how lithographic performance can be tuned to allow sub 5 micron via using broad band illumination. Finally we will review the impact of low temperature processing on the mechanical, thermal and electrical properties of this novel photoimageable dielectric material.

The Double-Layer Matching Design of Broad-Band Foam Cement Absorbing Panel for Electromagnetic Pollution Control

2013 ◽  
Vol 401-403 ◽  
pp. 924-928 ◽  
Author(s):  
Fan Wu ◽  
Wan Jun Hao ◽  
Yue Fang Zhang ◽  
Ming Ming Wang ◽  
Dong Wei Chen ◽  
...  
Keyword(s):  
Double Layer ◽  
Pollution Control ◽  
High Performance ◽  
Simulation Analysis ◽  
Dielectric Material ◽  
Broad Band ◽  
Electromagnetic Environment ◽  
Resistive Film ◽  
Matching Design ◽  
Electromagnetic Pollution

Based on the principle of electromagnetic wave absorption, through the double-layer matching design and simulation analysis, taking foam cement panel as the dielectric material, combining with the resistive film, the paper has successfully prepared high-performance and broad-band foam cement absorbing panel for electromagnetic pollution control. The result shows, with the use of double-matching design that combines 140 Ω/□ resistive film with foam cement absorbing panel whose each layer thickness is 1.4 cm, in the S band , 100% of bandwidth below-10 dB and 95% of bandwidth below-14 dB can be reached, a maximum absorption of-19.6 dB at 2.45 GHz, the width of the absorption is far more than that of λ/4 type absorber. New materials can be used for the improvement of indoor electromagnetic environment and pollution control.

scholarly journals Robust Conformal Perfect Absorber Involving Lossy Ultrathin Film

Photonics ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 57
Author(s):  
Lei Zhang ◽  
Kun Wang ◽  
Hui Chen ◽  
Yanpeng Zhang
Keyword(s):  
Near Infrared ◽  
Incident Angle ◽  
Broad Band ◽  
Infrared Range ◽  
Subwavelength Structures ◽  
Perfect Absorber ◽  
Perfect Absorption ◽  
Absorption Performance ◽  
Near Infrared Range ◽  
Lossy Material

Perfect absorbers have been extensively investigated due to their significant value in solar cell, photodetection, and stealth technologies. Various subwavelength structures have been proposed to improve the absorption performances, such as high absorptance, broad band, and wide absorption angle. However, excellent performances usually put forward higher requirements on structural designs, such as varying the geometry sizes or shapes to fit different center wavelengths, which inevitably increases the fabrication burden. Here, a planar sandwich structure involving a layer of highly lossy material is proposed to achieve a robust perfect absorption with 95% absorptance ranging from the visible to near infrared range. Such an excellent absorption performance is also polarization-independent and applicable to a wide incident angle. Furthermore, the proposed design can also be applied to conformal surfaces with a 90% fluctuation over a steep surface. We believe that the proposed perfect absorber with distinguished performances can find wide application.

scholarly journals Switchable Multifunctional Meta-Surface Composed by Dielectric-Metal Hybrid Antenna Array Architecture

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2862
Author(s):  
Yule Huang ◽  
Jiaxin Yang ◽  
Ying Zhang ◽  
Zhongchao Wei ◽  
Hongzhan Liu ◽  
...  
Keyword(s):  
Antenna Array ◽  
Dielectric Material ◽  
Single Layer ◽  
Elliptic Cylinder ◽  
High Refractive Index ◽  
Polarization Conversion ◽  
Perfect Absorption ◽  
Array Architecture ◽  
Environment Temperature ◽  
The One

Strontium titanate (STO), the dielectric material, has caught the world’s attention due to its outstanding properties, such as high permittivity, high refractive index, and low loss in the terahertz band. Its permittivity is relevant to the environment temperature. Herein, a multifunctional meta-surface composed of a dielectric-metal hybrid antenna array has been demonstrated, which is a single-layer STO elliptic cylinder. On the one hand, when the environment temperature is 300 K, the proposed meta-surface can achieve perfect absorption and polarization conversion in the frequency range from 0.1 to 0.25 THz; particularly, the meta-surface absorptance can reach 99.97% and 99.92% at a frequency of 0.103 and 0.13 THz respectively, and while it is used as a polarization conversion device, the degree of circular polarization and the ellipticity angle can reach 0.986 and 44.5° at a frequency of 0.228 THz. On the other hand, when the environment temperature changes from 300 to 450 K, the absorption peak changes with the temperature, and the average absorptance reaches 96% at resonance frequency. The proposed meta-surface can be applied in many fields, such as optical sensing, imaging, and energy harvesting. Moreover, it provides a potential solution to research the integrated device in a complex electromagnetic environment.

scholarly journals Non-linear coherent perfect absorption in the proximity of exceptional points

2022 ◽  
Vol 5 (1) ◽  
Author(s):  
Suwun Suwunnarat ◽  
Yaqian Tang ◽  
Mattis Reisner ◽  
Fabrice Mortessagne ◽  
Ulrich Kuhl ◽  
...  
Keyword(s):  
Broad Band ◽  
Exceptional Point ◽  
Frequency Range ◽  
Perfect Absorption ◽  
Band Frequency ◽  
Exceptional Points ◽  
Coherent Perfect Absorption ◽  
Non Linear ◽  
Nonlinear Resonator ◽  
High Absorption

AbstractCoherent perfect absorption is one of the possibilities to get high absorption but typically suffers from being a resonant phenomena, i.e., efficient absorption only in a local frequency range. Additionally, if applied in high power applications, the understanding of the interplay of non-linearities and coherent perfect absorption is crucial. Here we show experimentally and theoretically the formation of non-linear coherent perfect absorption in the proximity of exceptional point degeneracies of the zeros of the scattering function. Using a microwave platform, consisting of a lossy nonlinear resonator coupled to two interrogating antennas, we show that a coherent incident excitation can trigger a self-induced perfect absorption once its intensity exceeds a critical value. Note, that a (near) perfect absorption persists for a broad-band frequency range around the nonlinear coherent perfect absorption condition. Its origin is traced to a quartic behavior that the absorbance spectrum acquires in the proximity of the exceptional points of the nonlinear scattering operator.

Chronic Laser Exposure Effects on Rabbit Retina

1972 ◽  
Vol 30 ◽  
pp. 54-55
Author(s):  
Burton B. Silver ◽  
Theodore Lawwill
Keyword(s):  
Laser Irradiation ◽  
Laser Light ◽  
Broad Band ◽  
Argon Laser ◽  
Atropine Sulfate ◽  
Ultrastructural Changes ◽  
Laser Exposure ◽  
Rabbit Retina ◽  
Histological Changes ◽  
Threshold Doses

Dutch-belted 1 to 2.5 kg anesthetized rabbits were exposed to either xenon or argon laser light administered in a broad band, designed to cover large areas of the retina. For laser exposure, the pupil was dilated with atropine sulfate 1% and pheny lephrine 10%. All of the laser generated power was within a band centered at 5145.0 Anstroms. Established threshold for 4 hour exposures to laser irradiation are in the order of 25-35 microwatts/cm2. Animals examined for ultrastructural changes received 4 hour threshold doses. These animals exhibited ERG, opthalmascopic, and histological changes consistent with threshold damage.One month following exposure the rabbits were killed with pentobarbitol. The eyes were immediately enucleated and dissected while bathed in 3% phosphate buffered gluteraldehyde.

Real-ear Masking Calibration for Portable Pure-Tone Audiometers

1984 ◽  
Vol 15 (4) ◽  
pp. 289-294
Author(s):  
Martin S. Robinette ◽  
Robert H. Brey
Keyword(s):  
Pure Tone ◽  
Broad Band ◽  
Resistive Network ◽  
Many Instruments

A transformer mixing network is described which allows the calibration of broad-band masking for portable audiometers that lack a built-in mixing network. For many instruments the transformer network is preferable to the resistive network previously published.

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