Design of Green Light Sources using Nonlinear Photonics and On-Chip Pump Lasers

Most theories of colour constancy assume a flat coloured surface and a single homogenous light source. Natural situations, however, are 3-dimensional (3-D), are hardly ever restricted to a single light source, and object illumination is never homogenous. Here, two special cases of secondary light sources with sharp boundaries were simulated on a computer screen: a house-like 3-D object with colour patches in sunlight and shadow, and a Mondrian-type pattern with a coloured transparency covering some of the colour patches. Subjects made ‘paper’-matches between colour patches in light and shadow and between patches under the transparency and without the transparency. Matching did not depend on whether the simulated lighting condition was natural (yellow light, blue shadow) or artificial (green light, magenta shadow). Patches under a coloured transparency produced lightness constancy but subjects could not discount chromaticity shifts induced by the transparency. The number of context patches (2 vs 6) made no difference, and it made no difference whether the transparency covered the Mondrian completely or only partially. These results indicate that subjects were not able to use local contrast cues at sharp illumination boundaries to discount for the illuminant.

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Plasmonic Nanolasers in On-Chip Light Sources: Prospects and Challenges

ACS Nano ◽

10.1021/acsnano.0c07011 ◽

2020 ◽

Vol 14 (11) ◽

pp. 14375-14390

Author(s):

Yin Liang ◽

Chun Li ◽

Yong-Zhen Huang ◽

Qing Zhang

Keyword(s):

Light Sources ◽

On Chip

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Influence of green light illumination at night on biological characteristics of the oriental armyworm, Mythimna separata (Lepidoptera: Noctuidae)

Bulletin of Entomological Research ◽

10.1017/s0007485319000397 ◽

2019 ◽

Vol 110 (1) ◽

pp. 136-143 ◽

Cited By ~ 1

Author(s):

K.-N. Kim ◽

Y.-C. Jo ◽

Z.-J. Huang ◽

Hye-Seng Song ◽

K.-H. Ryu ◽

...

Keyword(s):

Developmental Stages ◽

Dark Period ◽

Control Level ◽

Green Light ◽

Biological Characteristics ◽

Light Illumination ◽

Light Sources ◽

Mythimna Separata ◽

Phototactic Behavior ◽

Oriental Armyworm

AbstractThe oriental armyworm, Mythimna separata is an important crop pest in eastern Asia. Nocturnal insects, including nocturnal moths, have phototactic behavior to an artificial light source. Phototactic behavior in insects is species-specific in response to different wavelengths of light sources. Our previous study showed that green (520 nm) light emitting diode (LED) light resulted in a significantly higher phototactic behavior in M. separata moths compared to the other wavelength LED lights. The goal of the present study is to investigate the influence of green light illumination on biological characteristics of different developmental stages in M. separata. Our results revealed that when different developmental stages of M. separata were exposed to the green light illumination in a dark period, several biological characteristics in all developmental stages except for egg stage were positively changed, but those of F1 generation M. separata which are next generation of the adults exposed to the green light did not significantly change compared with the control level. These findings suggest that green light illumination at night (or dark period) has a positive effect on the development and longevity of M. separata.

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A highly stable, nanotube-enhanced, CMOS-MEMS thermal emitter for mid-IR gas sensing

Scientific Reports ◽

10.1038/s41598-021-02121-5 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Daniel Popa ◽

Richard Hopper ◽

Syed Zeeshan Ali ◽

Matthew Thomas Cole ◽

Ye Fan ◽

...

Keyword(s):

Gas Sensing ◽

Low Cost ◽

Complementary Metal Oxide Semiconductor ◽

Oxide Semiconductor ◽

Light Sources ◽

Mir Spectroscopy ◽

Sensing Applications ◽

Cmos Mems ◽

Extended Operation ◽

On Chip

AbstractThe gas sensor market is growing fast, driven by many socioeconomic and industrial factors. Mid-infrared (MIR) gas sensors offer excellent performance for an increasing number of sensing applications in healthcare, smart homes, and the automotive sector. Having access to low-cost, miniaturized, energy efficient light sources is of critical importance for the monolithic integration of MIR sensors. Here, we present an on-chip broadband thermal MIR source fabricated by combining a complementary metal oxide semiconductor (CMOS) micro-hotplate with a dielectric-encapsulated carbon nanotube (CNT) blackbody layer. The micro-hotplate was used during fabrication as a micro-reactor to facilitate high temperature (>700 $$^{\circ }$$ ∘ C) growth of the CNT layer and also for post-growth thermal annealing. We demonstrate, for the first time, stable extended operation in air of devices with a dielectric-encapsulated CNT layer at heater temperatures above 600 $$^{\circ }$$ ∘ C. The demonstrated devices exhibit almost unitary emissivity across the entire MIR spectrum, offering an ideal solution for low-cost, highly-integrated MIR spectroscopy for the Internet of Things.

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Nanowires Integrated to Optical Waveguides

10.5772/intechopen.95689 ◽

2021 ◽

Author(s):

Ricardo Téllez-Limón ◽

Rafael Salas-Montiel

Keyword(s):

Optical Waveguides ◽

Optical Filters ◽

Photonic Devices ◽

Light Sources ◽

Dielectric Waveguides ◽

Metallic Nanowires ◽

Research Subjects ◽

Periodic Arrays ◽

On Chip ◽

Physical Phenomena

Chip-scale integrated optical devices are one of the most developed research subjects in last years. These devices serve as a bridge to overcome size mismatch between diffraction-limited bulk optics and nanoscale photonic devices. They have been employed to develop many on-chip applications, such as integrated light sources, polarizers, optical filters, and even biosensing devices. Among these integrated systems can be found the so-called hybrid photonic-plasmonic devices, structures that integrate plasmonic metamaterials on top of optical waveguides, leading to outstanding physical phenomena. In this contribution, we present a comprehensive study of the design of hybrid photonic-plasmonic systems consisting of periodic arrays of metallic nanowires integrated on top of dielectric waveguides. Based on numerical simulations, we explain the physics of these structures and analyze light coupling between plasmonic resonances in the nanowires and the photonic modes of the waveguides below them. With this chapter we pretend to attract the interest of research community in the development of integrated hybrid photonic-plasmonic devices, especially light interaction between guided photonic modes and plasmonic resonances in metallic nanowires.

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A highly stable, nanotube-enhanced, CMOS-MEMS thermal emitter for mid-IR gas sensing

10.21203/rs.3.rs-772425/v1 ◽

2021 ◽

Author(s):

Daniel Popa ◽

Richard Hopper ◽

Syed Zeeshan Ali ◽

Matthew Cole ◽

Ye Fan ◽

...

Keyword(s):

Gas Sensing ◽

Low Cost ◽

Complementary Metal Oxide Semiconductor ◽

Oxide Semiconductor ◽

Light Sources ◽

Mir Spectroscopy ◽

Sensing Applications ◽

Cmos Mems ◽

Extended Operation ◽

On Chip

Abstract The gas sensor market is growing fast, driven by many socioeconomic and industrial factors. Mid-infrared (MIR) gas sensors offer excellent performance for an increasing number of sensing applications in healthcare, smart homes, and the automotive sector. Having access to low-cost, miniaturized, energy efficient light sources is of critical importance for the monolithic integration of MIR sensors. Here, we present an on-chip broadband thermal MIR source fabricated by combining a complementary metal oxide semiconductor (CMOS) micro-hotplate with a dielectric-encapsulated carbon nanotube (CNT) blackbody layer. The micro-hotplate was used during fabrication as a micro-reactor to facilitate high temperature (>700 • C) growth of the CNT layer and also for post-growth thermal annealing. We demonstrate, for the first time, stable extended operation in air of devices with a dielectric-encapsulated CNT layer at heater temperatures above 600 • C. The demonstrated devices exhibit almost unitary emissivity across the entire MIR spectrum, offering an ideal solution for low-cost, highly-integrated MIR spectroscopy for the Internet of Sensors.

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“Three-Bullets” Loaded Mesoporous Silica Nanoparticles for Combined Photo/Chemotherapy

Nanomaterials ◽

10.3390/nano9060823 ◽

2019 ◽

Vol 9 (6) ◽

pp. 823 ◽

Cited By ~ 3

Author(s):

André Luiz Tessaro ◽

Aurore Fraix ◽

Ana Claudia Pedrozo da Silva ◽

Elena Gazzano ◽

Chiara Riganti ◽

...

Keyword(s):

Mesoporous Silica ◽

Silica Nanoparticles ◽

Mesoporous Silica Nanoparticles ◽

Outer Part ◽

Green Light ◽

Biological Evaluation ◽

Light Sources ◽

Good Tolerability ◽

Physiological Conditions ◽

The Individual

This contribution reports the design, preparation, photophysical and photochemical characterization, as well as a preliminary biological evaluation of mesoporous silica nanoparticles (MSNs) covalently integrating a nitric oxide (NO) photodonor (NOPD) and a singlet oxygen (1O2) photosensitizer (PS) and encapsulating the anticancer doxorubicin (DOX) in a noncovalent fashion. These MSNs bind the NOPD mainly in their inner part and the PS in their outer part in order to judiciously exploit the different diffusion radius of the cytotoxic NO and 1O2. Furthermore this silica nanoconstruct has been devised in such a way to permit the selective excitation of the NOPD and the PS with light sources of different energy in the visible window. We demonstrate that the individual photochemical performances of the photoactive components of the MSNs are not mutually affected, and remain unaltered even in the presence of DOX. As a result, the complete nanoconstruct is able to deliver NO and 1O2 under blue and green light, respectively, and to release DOX under physiological conditions. Preliminary biological results performed using A375 cancer cells show a good tolerability of the functionalized MSNs in the dark and a potentiated activity of DOX upon irradiation, due to the effect of the NO photoreleased.

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