Optimized design of N optical filters for color and polarization imaging

Xingzhou Tu; Stanley Pau

doi:10.1364/oe.24.003011

CCD polarization imaging sensor with aluminum nanowire optical filters

Optics Express ◽

10.1364/oe.18.019087 ◽

2010 ◽

Vol 18 (18) ◽

pp. 19087 ◽

Cited By ~ 202

Author(s):

Viktor Gruev ◽

Rob Perkins ◽

Timothy York

Keyword(s):

Optical Filters ◽

Polarization Imaging ◽

Imaging Sensor

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Dichroic Circular Polarizers Based on Plasmonics for Polarization Imaging Applications

Nanomaterials ◽

10.3390/nano11082145 ◽

2021 ◽

Vol 11 (8) ◽

pp. 2145

Author(s):

Junyan Zheng ◽

Xin He ◽

Paul Beckett ◽

Xinjie Sun ◽

Zixin Cai ◽

...

Keyword(s):

Incident Light ◽

Polarization State ◽

Optical Loss ◽

Optical Filters ◽

Transmission Efficiency ◽

Visible Range ◽

Angle Of Incidence ◽

Polarization Imaging ◽

Visible Wavelengths ◽

Maximum Transmission

Dichroic circular polarizers (DCP) represent an important group of optical filters that transfer only that part of the incident light with the desired polarization state and absorb the remainder. However, DCPs are usually bulky and exhibit significant optical loss. Moreover, the integration of these kinds of DCP devices can be difficult and costly as different compositions of chemicals are needed to achieve the desired polarization status. Circular polarizers based on metasurfaces require only thin films in the order of hundreds of nanometers but are limited by their sensitivity to angle of incidence. Furthermore, few existing solutions offer broadband operation in the visible range. By using computational simulations, this paper proposes and analyses a plasmonic DCP structure operating in the visible, from 400 nm to 700 nm which overcomes these drawbacks. The resulting circular dichroism transmission (CDT) is more than 0.9, and the maximum transmission efficiency is greater than 78% at visible wavelengths. These CDT characteristics are largely independent of angle of incidence up to angles of 80 degrees.

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Differential polarization imaging of sickled cells

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100102390 ◽

1988 ◽

Vol 46 ◽

pp. 62-63

Author(s):

Marcos F. Maestre

Keyword(s):

Optical Properties ◽

Theoretical Approach ◽

Polarized Light ◽

Polarization Microscopy ◽

Spectroscopic Techniques ◽

Polarization Imaging ◽

Circularly Polarized Light ◽

Circularly Polarized ◽

Microscopic Scale ◽

Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

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Optimized Design Method of Microstrip Parallel-coupled Bandpass Filters with Compensation for Center Frequency Deviation

PIERS Online ◽

10.2529/piers041206062500 ◽

2005 ◽

Vol 1 (3) ◽

pp. 298-302 ◽

Cited By ~ 1

Author(s):

Houle Gan ◽

Dongxiao Yang ◽

Dongwu Lou

Keyword(s):

Design Method ◽

Bandpass Filters ◽

Frequency Deviation ◽

Center Frequency ◽

Optimized Design

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A summary of beach nourishment in China: The past decade of practices

Shore & Beach ◽

10.34237/1008836 ◽

2020 ◽

pp. 65-73

Author(s):

Gen Liu ◽

Feng Cai ◽

Hongshuai Qi ◽

Jianhui Liu ◽

Gang Lei ◽

...

Keyword(s):

Beach Nourishment ◽

Developed Countries ◽

Ecological Design ◽

Optimized Design ◽

Limited Information ◽

Personal Communications ◽

Design Considerations ◽

The Past ◽

Technological Advances ◽

Urban Beaches

Beach nourishment has been widely used for beach protection around the world. However, there is limited information about beach nourishment in China. This study offers an overview of beach nourishment practices, status and technological advances in China, based on the literature, reports, and personal communications. The results demonstrate that beach nourishment has been recognized as an effective and environmentally friendly measure to combat coastal erosion and has been increasingly adopted in China, especially in the past decade. The unique characteristics of coastal China resulted in a difference in beach nourishment between China and Western developed countries in terms of the types, objectives, and shapes of beach nourishment. For the types of nourishments in China, there were approximately the same number of restored beaches and newly constructed beaches. For fill sediment, homogeneous fill and heterogeneous fill comprised 51.1% and 48.9% of projects, respectively. The objective of beach nourishment was mainly to promote coastal tourism, and the shape of nourished beaches was dominated by headland bays. This study also indicated that China has achieved a number of technological advances in beach nourishment, including methods of beach nourishment on severely eroded coasts and muddy coasts, an optimized design of drain pipes involved in urban beaches, and ecological design considerations. From the past decade of practices, four aspects were proposed as considerations for future nourishment: sand sources, technique advances, ecological effects, and management of beach nourishments.

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