High-efficiency ultra-compact near-infrared supercontinuum generated in an ultrashort cavity configuration

Smart windows can dynamically and adaptively adjust the light transmittance in non-energy or low-energy ways to maintain a comfortable ambient temperature, which are conducive to efficient use of energy. This work proposes a liquid crystal (LC) smart window with highly efficient near-infrared (NIR) response using carbon nanotubes grafted by biphenyl LC polymer brush (CNT-PDB) as the orientation layer. The resultant CNT-PDB polymer brush can provide the vertical orientation of LC molecules to maintain the initial transparency. At the same time, the smart window shows a rapid response to NIR light, which can quickly adjust the light transmittance to prevent sunlight from entering the room. Different from common doping systems, this method avoids the problem of poor compatibility between the LC host and photothermal conversion materials, which is beneficial for improving the durability of the device.

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Origin of High-Efficiency Near-Infrared Organic Thermally Activated Delayed Fluorescence: The Role of Electronic Polarization

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.0c09582 ◽

2021 ◽

Vol 125 (2) ◽

pp. 1249-1255

Author(s):

Taiping Hu ◽

Zeyi Tu ◽

Guangchao Han ◽

Yuanping Yi

Keyword(s):

Near Infrared ◽

High Efficiency ◽

Delayed Fluorescence ◽

Electronic Polarization ◽

Thermally Activated Delayed Fluorescence ◽

Thermally Activated

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Antireflective and Superhydrophilic Structure on Graphite Written by Femtosecond Laser

Micromachines ◽

10.3390/mi12030236 ◽

2021 ◽

Vol 12 (3) ◽

pp. 236

Author(s):

Rui Lou ◽

Guangying Li ◽

Xu Wang ◽

Wenfu Zhang ◽

Yishan Wang ◽

...

Keyword(s):

Femtosecond Laser ◽

Near Infrared ◽

High Efficiency ◽

Electronic Devices ◽

Sample Surface ◽

Graphite Surface ◽

Hazardous Substances ◽

Functional Surface ◽

Nano Structures ◽

Average Reflectance

Antireflection and superhydrophilicity performance are desirable for improving the properties of electronic devices. Here, we experimentally provide a strategy of femtosecond laser preparation to create micro-nanostructures on the graphite surface in an air environment. The modified graphite surface is covered with abundant micro-nano structures, and its average reflectance is measured to be 2.7% in the ultraviolet, visible and near-infrared regions (250 to 2250 nm). The wettability transformation of the surface from hydrophilicity to superhydrophilicity is realized. Besides, graphene oxide (GO) and graphene are proved to be formed on the sample surface. This micro-nanostructuring method, which demonstrates features of high efficiency, high controllability, and hazardous substances zero discharge, exhibits the application for functional surface.

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Intermolecular charge-transfer aggregates enable high-efficiency near-infrared emissions by nonadiabatic coupling suppression

Science China Chemistry ◽

10.1007/s11426-021-1096-8 ◽

2021 ◽

Vol 64 (10) ◽

pp. 1786-1795

Author(s):

Jie Xue ◽

Jingyi Xu ◽

Jiajun Ren ◽

Qingxin Liang ◽

Qi Ou ◽

...

Keyword(s):

Charge Transfer ◽

Near Infrared ◽

High Efficiency ◽

Nonadiabatic Coupling ◽

Intermolecular Charge Transfer ◽

Infrared Emissions

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Low-frequency multiplex CARS microscopy with a high-repetition near-infrared supercontinuum laser

Applied Physics Express ◽

10.35848/1882-0786/ac39b1 ◽

2021 ◽

Author(s):

Yusuke Arashida ◽

Atsushi Taninaka ◽

Takayuki Ochiai ◽

Hiroyuki Mogi ◽

Shoji YOSHIDA ◽

...

Keyword(s):

Near Infrared ◽

High Efficiency ◽

Signal To Noise Ratio ◽

Low Frequency ◽

High Sensitivity ◽

High Repetition ◽

Spectrum Shaping ◽

Crystal Phase Transition ◽

Wavenumber Region ◽

Anti Stokes

Abstract We have developed a multiplex Coherent anti-Stokes Raman scattering (CARS) microscope effective for low-wavenumber measurement by combining a high-repetition supercontinuum light source of 1064 nm and an infrared high-sensitivity InGaAs diode array. This system could observe the low-wavenumber region down to 55 cm-1 with high sensitivity. In addition, using spectrum shaping and spectrum modulation techniques, we simultaneously realized a wide bandwidth (<1800 cm-1), high wavenumber resolution (9 cm-1), high efficiency, and increasing signal to noise ratio by reducing the effect of the background shape in low-wavenumber region. Spatial variation of a sulfur crystal phase transition with metastable states was visualized.

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Functional Near-Infrared Spectroscopy for the Classification of Motor-Related Brain Activity on the Sensor-Level

Sensors ◽

10.3390/s20082362 ◽

2020 ◽

Vol 20 (8) ◽

pp. 2362 ◽

Cited By ~ 7

Author(s):

Alexander E. Hramov ◽

Vadim Grubov ◽

Artem Badarin ◽

Vladimir A. Maksimenko ◽

Alexander N. Pisarchik

Keyword(s):

Infrared Spectroscopy ◽

Near Infrared Spectroscopy ◽

Near Infrared ◽

High Efficiency ◽

Brain Activity ◽

Blood Oxygenation ◽

Hemispheric Lateralization ◽

Motor Execution ◽

Functional Near Infrared Spectroscopy

Sensor-level human brain activity is studied during real and imaginary motor execution using functional near-infrared spectroscopy (fNIRS). Blood oxygenation and deoxygenation spatial dynamics exhibit pronounced hemispheric lateralization when performing motor tasks with the left and right hands. This fact allowed us to reveal biomarkers of hemodynamical response of the motor cortex on the motor execution, and use them for designing a sensing method for classification of the type of movement. The recognition accuracy of real movements is close to 100%, while the classification accuracy of imaginary movements is lower but quite high (at the level of 90%). The advantage of the proposed method is its ability to classify real and imaginary movements with sufficiently high efficiency without the need for recalculating parameters. The proposed system can serve as a sensor of motor activity to be used for neurorehabilitation after severe brain injuries, including traumas and strokes.

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Dinuclear platinum(ii) complex dominated by a zig-zag-type cyclometalated ligand: a new approach to realize high-efficiency near infrared emission

Journal of Materials Chemistry C ◽

10.1039/c8tc01142g ◽

2018 ◽

Vol 6 (21) ◽

pp. 5769-5777 ◽

Cited By ~ 14

Author(s):

Shengyi Yang ◽

Fanyuan Meng ◽

Xiugang Wu ◽

Zheng Yin ◽

Xianzhi Liu ◽

...

Keyword(s):

Near Infrared ◽

High Efficiency ◽

Infrared Emission ◽

New Approach ◽

Dinuclear Platinum ◽

Near Infrared Emission ◽

Cyclometalated Ligand

Two new zig-zag type di- and mono-nuclear platinum(ii) complexes of (BuPh-BDIQ)Pt2(dpm)2 and (BuPh-BDIQ)Ptdpm were synthesized and characterized by using a zig-zag type cyclometalating ligand BuPh-BDIQ.

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High-efficiency 50 W burst-mode hundred picosecond green laser

High Power Laser Science and Engineering ◽

10.1017/hpl.2020.2 ◽

2020 ◽

Vol 8 ◽

Author(s):

Ning Ma ◽

Meng Chen ◽

Ce Yang ◽

Shang Lu ◽

Xie Zhang ◽

...

Keyword(s):

Near Infrared ◽

High Efficiency ◽

Second Harmonic ◽

Beam Quality ◽

Average Power ◽

High Energy ◽

Green Laser ◽

Type I ◽

Regenerative Amplifier ◽

Burst Mode

We report high-energy, high-efficiency second harmonic generation in a near-infrared all-solid-state burst-mode picosecond laser at a repetition rate of 1 kHz with four pulses per burst using a type-I noncritical phase-matching lithium triborate crystal. The pulses in each burst have the same time delay ( ${\sim}1~\text{ns}$ ), the same pulse duration ( ${\sim}100~\text{ps}$ ) and different relative amplitudes that can be adjusted separately. A mode-locked beam from a semiconductor saturable absorber mirror is pulse-stretched, split into seed pulses and injected into a Nd:YAG regenerative amplifier. After the beam is reshaped by aspheric lenses, a two-stage master oscillator power amplifier and 4f imaging systems are applied to obtain a high power of ${\sim}100~\text{W}$ . The 532 nm green laser has a maximum conversion efficiency of 68%, an average power of up to 50 W and a beam quality factor $M^{2}$ of 3.5.

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