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Articles de revues sur le sujet « Near IR light »

Auteur : Grafiati
Publié le 25 janvier 2025

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1

Georgiev, Georgi V., Wei Cao, Weiwei Zhang, Li Ke, David J. Thomson, Graham T. Reed, Milos Nedeljkovic et Goran Z. Mashanovich. « Near-IR & ; Mid-IR Silicon Photonics Modulators ». Sensors 22, no 24 (8 décembre 2022) : 9620. http://dx.doi.org/10.3390/s22249620.

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As the silicon photonics field matures and a data-hungry future looms ahead, new technologies are required to keep up pace with the increase in capacity demand. In this paper, we review current developments in the near-IR and mid-IR group IV photonic modulators that show promising performance. We analyse recent trends in optical and electrical co-integration of modulators and drivers enabling modulation data rates of 112 GBaud in the near infrared. We then describe new developments in short wave infrared spectrum modulators such as employing more spectrally efficient PAM-4 coding schemes for modulations up to 40 GBaud. Finally, we review recent results at the mid infrared spectrum and application of the thermo-optic effect for modulation as well as the emergence of new platforms based on germanium to tackle the challenges of modulating light in the long wave infrared spectrum up to 10.7 μm with data rates of 225 MBaud.
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BENARON, DAVID A. « Measuring and Imaging in Tissue Using Near-IR Light ». Optics and Photonics News 3, no 10 (1 octobre 1992) : 27. http://dx.doi.org/10.1364/opn.3.10.000027.

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Smetanina, E. O., V. O. Kompanets, A. E. Dormidonov, S. V. Chekalin et V. P. Kandidov. « Light bullets from near-IR filament in fused silica ». Laser Physics Letters 10, no 10 (14 août 2013) : 105401. http://dx.doi.org/10.1088/1612-2011/10/10/105401.

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Enomoto, Takafumi, Mio Kondo, Mizue Asada, Toshikazu Nakamura et Shigeyuki Masaoka. « Near-IR Light-Induced Electron Transfer via Dynamic Quenching ». Journal of Physical Chemistry C 122, no 21 (8 mai 2018) : 11282–87. http://dx.doi.org/10.1021/acs.jpcc.8b02591.

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Wang, Gang, Baibiao Huang, Zhujie Li, Zeyan Wang, Xiaoyan Qin, Xiaoyang Zhang, Ying Dai et Myung-Hwan Whangbo. « On Structural Features Necessary for Near-IR-Light Photocatalysts ». Chemistry - A European Journal 21, no 39 (28 juillet 2015) : 13583–87. http://dx.doi.org/10.1002/chem.201501477.

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Wisotzky, Eric L., Florian C. Uecker, Jean-Claude Rosenthal, Philipp Arens et Armin Schneider. « Near-UV to Near-IR Multispectral Illumination in a Digital Surgical Microscope ». Current Directions in Biomedical Engineering 7, no 2 (1 octobre 2021) : 464–67. http://dx.doi.org/10.1515/cdbme-2021-2118.

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Abstract We present a stereo-multispectral microscope equipped with an additional illumination unit allowing further narrow-band illumination in the spectral range of 400n.m up to 800nm. The combination of the normal microscope illumination with the multispectral light unit allows different illumination modalities to be realized, which enables intraoperative spectral tissue analysis with direct visualization. Two illumination methods were tested in two cholesteatoma surgeries. In addition, two cholesteatom samples were illuminated and analyzed ex vivo. Cholesteatoma showed :fluorescent characteristics in our ex vivo analysis. This behavior could be used intraoperatively using a combination of white light and strong near-UV to blue illumination to highlight cholesteatoma tissue in the microscopic image. Thus, the visual differentiability of different tissue types can be improved and the clinical decision-making process can be accelerated.
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Sams, B. J., R. Genzel, A. Krabbe, N. Thatte et H. Kroker. « Near-IR Imaging Spectroscopy of CD Galaxy NGC1275 ». Symposium - International Astronomical Union 171 (1996) : 440. http://dx.doi.org/10.1017/s0074180900233585.

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H and K band imaging spectroscopy of the central 12″ (4.2 kpc) of NGC1275 using the Max-Planck-Institut für extraterrestrische Physik imaging spectrometer “3D” maps the gas density and temperature in the core and separates the contribution of Seyfert emission to the core light.
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Gong, Yan, Asantha Cooray, Ketron Mitchell-Wynne, Xuelei Chen, Michael Zemcov et Joseph Smidt. « AXION DECAY AND ANISOTROPY OF NEAR-IR EXTRAGALACTIC BACKGROUND LIGHT ». Astrophysical Journal 825, no 2 (7 juillet 2016) : 104. http://dx.doi.org/10.3847/0004-637x/825/2/104.

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Guffey, J., William Payne, Kyle Martin, Leslie James et Zhuoyuan Qian. « Inhibition of Mycobacterium smegmatis using near-IR and blue light ». International Journal of Research in Medical Sciences 2, no 1 (2014) : 42. http://dx.doi.org/10.5455/2320-6012.ijrms20140209.

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Tang, X., B. W. Jiang et J. N. Fu. « NEAR-INFRARED LIGHT VARIATION OF SINGLE-PEAKED OH/IR STARS ». Astronomical Journal 135, no 5 (31 mars 2008) : 1681–91. http://dx.doi.org/10.1088/0004-6256/135/5/1681.

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KIMURA, Mutsumi. « Photoelectric Conversion Efficiency Improvement of Near-IR Light Absorbing Dyes ». Journal of the Japan Society of Colour Material 96, no 11 (20 novembre 2023) : 378–82. http://dx.doi.org/10.4011/shikizai.96.378.

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Pozzetti, Lucia, et Piero Madau. « The Optical Extragalactic Background Light from Resolved Galaxies ». Symposium - International Astronomical Union 204 (2001) : 71–85. http://dx.doi.org/10.1017/s0074180900225916.

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We discuss the ultraviolet to near-IR galaxy counts from the deepest imaging surveys, including the northern and southern Hubble Deep Fields. The logarithmic slope of the galaxy number-magnitude relation is flatter than 0.4 in all seven UBVIJHK optical passbands at faint magnitudes, i.e. the light from resolved galaxies has converged from the UV to the near-IR. Most of the galaxy contribution to the extragalactic background light (BEL) comes from relatively bright, low-redshift objects (50% at VAB ≲ 21 and 90% at VAB ≲ 25.5). We find a lower limit to the surface brightness of the optical EBL of about 15 nW m−2 sr−1, comparable to the intensity of the far-IR background from COBE data. Diffuse light, lost because of surface brightness selection effects, may add substantially to the EBL.
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Michael Dcona, M., Qing Yu, John A. Capobianco et Matthew C. T. Hartman. « Near infrared light mediated release of doxorubicin using upconversion nanoparticles ». Chemical Communications 51, no 40 (2015) : 8477–79. http://dx.doi.org/10.1039/c5cc01795e.

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Aruev P. N., Belik V. P., Blokhin A. A., Zabrodskii V. V., Nikolaev A. V., Sakharov V. I., Serenkov I. T., Filimonov V. V. et Sherstnev E. V. « In memoriam of E.M. Kruglov and V.V. Filimonov Quantum yield of an avalanche silicon photodiode in the 114-170 and 210-1100 nm wavelength ranges ». Technical Physics Letters 48, no 3 (2022) : 3. http://dx.doi.org/10.21883/tpl.2022.03.52871.19026.

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An avalanche silicon photodiode has been developed for the near IR, visible, UV and VUV light ranges. The external quantum efficiency has been studied in the 114-170 and 210-1100 nm ranges. It has been demonstrated that the avalanche photodiode reaches the quantum yield of 29 to 9300 electrons/photon at the 160 nm wavelength and bias voltage of 190-303 V, respectively. Keywords: avalanche photodiode, vacuum ultraviolet, visible light range, near IR, silicon
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Knyazev, Andrey A., Aleksandr S. Krupin et Yuriy G. Galyametdinov. « Anisometric Ln(III) Complexes with Efficient Near-IR Luminescence ». Inorganics 10, no 1 (11 janvier 2022) : 9. http://dx.doi.org/10.3390/inorganics10010009.

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Recent studies in development of near-infrared luminophores focus on overcoming their disadvantages such as low quantum efficiency, limited emission power, and broad emission spectra. Rare earth (RE) elements are promising compounds in this respect as they offer a unique set of optical properties that provide narrow emission spectra and large Stokes shifts. This work reports the results of synthesis and characterization of new anisometric complexes of lanthanide(III) tris(b-diketonates) and 1,10-phenanthroline. These complexes possess light emitting-properties in the near-infrared range. Due to their structural features, these complexes allow production of homogeneous films by spin coating. These films are transparent in the visible and near-infrared ranges (transmission up to 99%). This paper demonstrates advantages of Yb(III), Er(III), and Nd(III) complexes as potential components of highly efficient light-transforming NIR coatings.
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Yang, Hao, He Liu, Boxiang Song, Yuanrui Li, Deming Meng, Buyun Chen, Pan Hu et al. « Effects of roughness and resonant-mode engineering in all-dielectric metasurfaces ». Nanophotonics 9, no 6 (21 avril 2020) : 1401–10. http://dx.doi.org/10.1515/nanoph-2019-0501.

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AbstractThe development of all-dielectric metasurfaces vigorously prompts the applications of optical metasurfaces for the visible and near-IR light range. Compared to IR or longer wavelength light, visible and near-IR light have shorter wavelengths. As a result, surface roughness and imperfections of all-dielectric metasurfaces have larger scattering or absorption of visible and near-IR light, thereby directly affecting the performance of an all-dielectric metasurface. In this article, a volume-current method is adopted to study the effect of metasurface roughness. Numerical calculations based on the finite difference time domain (FDTD) method are also used to study the relationship between the effects of metasurface roughness and the optical resonant modes. Numerical predictions based on our theoretical studies fit the experimental data well. Further, the effect of different roughness levels on the all-dielectric metasurface performance is predicted. More importantly, a method utilizing resonant-mode engineering to enhance the metasurface performance (e.g. incident angle insensitivity) is also proposed and demonstrated. This work deepens our understanding of the working mechanism of all-dielectric metasurfaces and paves the way for their use in a broad spectrum of applications.
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He, Mingze, Sami I. Halimi, Thomas G. Folland, Sai S. Sunku, Song Liu, James H. Edgar, D. N. Basov, Sharon M. Weiss et Joshua D. Caldwell. « Guided Mid‐IR and Near‐IR Light within a Hybrid Hyperbolic‐Material/Silicon Waveguide Heterostructure ». Advanced Materials 33, no 11 (février 2021) : 2004305. http://dx.doi.org/10.1002/adma.202004305.

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Dai, Yuqiong, Hao Sun, Sunirmal Pal, Yunlu Zhang, Sangwoo Park, Christopher P. Kabb, Wei David Wei et Brent S. Sumerlin. « Near-IR-induced dissociation of thermally-sensitive star polymers ». Chemical Science 8, no 3 (2017) : 1815–21. http://dx.doi.org/10.1039/c6sc04650a.

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Responsive systems sensitive to near-infrared (NIR) light are promising for triggered release due to efficient deep tissue penetration of NIR irradiation relative to higher energy sources (e.g., UV), allowing for spatiotemporal control over triggering events with minimal potential for tissue damage.
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Mousavi, Behnam Kheyraddini, Morteza Rezaei Talarposhti, Farshid Karbassian et Arash Kheyraddini Mousavi. « Plasmon-assisted interaction of Si with light, for cancer hyperthermia and electromagnetic energy harvest ». European Physical Journal Applied Physics 92, no 2 (21 octobre 2020) : 20101. http://dx.doi.org/10.1051/epjap/2020200071.

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Metal-assisted chemical etching (MACE) is applied for fabrication of silicon nanowires (SiNWs). We have shown the effect of amorphous sheath of SiNWs by treating the nanowires with SF6 and the resulting reduction of absorption bandwidth, i.e. making SiNWs semi-transparent in near-infrared (IR). For the first time, by treating the fabricated SiNWs with copper containing HF∕H2O2∕H2O solution, we have generated crystalline nanowires with broader light absorption spectrum, up to λ = 1 μm. Both the absorption and photo-luminescence (PL) of the SiNWs are observed from visible to IR wavelengths. It is found that the SiNWs have PL at visible and near Infrared wavelengths, which may infer presence of mechanisms such as forbidden gap transitions other can involvement of plasmonic resonances. Non-radiative recombination of excitons is one of the reasons behind absorption of SiNWs. Also, on the dielectric metal interface, the absorption mechanism can be due to plasmonic dissipation or plasmon-assisted generation of excitons in the indirect band-gap material. Comparison between nanowires with and without metallic nanoparticles has revealed the effect of nanoparticles on absorption enhancement. The broader near IR absorption, paves the way for applications like hyperthermia of cancer while the optical transition in near IR also facilitates harvesting electromagnetic energy at a broad spectrum from visible to IR.
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Sharma, Sahil, Abhisek Sinha, Vandana Sharma et Ram gopal Sharma. « Field Enhancement in Nanoparticles Due to IR Vortex Beams ». ECS Transactions 107, no 1 (24 avril 2022) : 1255–69. http://dx.doi.org/10.1149/10701.1255ecst.

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In this report we present our study of interaction of light carrying OAM (Orbital Angular Momentum) with nanometric metallic discs. Plasmonic effects are known to give rise to high local field enhancement factors in gold nano-discs. These high intensities near fields have found use in a wide variety of imaging and detection applications. The local field enhancement factor near the surface of the disc was calculated numerically using finite element method using the Comsol package. We report a significant increase in the local field enhancement factor for light beams carrying OAM compared to Gaussian beams which are attributed to Localised Surface Plasmon Resonances (LSPR). Such large enhancements in the field can be immensely useful in the field on near field microscopy and electron generation.
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Zhu, Congcong, et Christopher J. Bettinger. « Light-induced remodeling of physically crosslinked hydrogels using near-IR wavelengths ». J. Mater. Chem. B 2, no 12 (2014) : 1613–18. http://dx.doi.org/10.1039/c3tb21689f.

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Light-induced disintegration of physically crosslinked hydrogel networks has been demonstrated by selective photodeprotection of self-assembled triblock copolymers. Physical crosslinks can be disrupted through uncaging of coumarin-based blocks using single- and two-photon absorption mechanisms. Photodegradable hydrogels exhibit promising applications as biomedical materials that can be manipulated using light at tissue-transparent wavelengths.
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Carleton, Timothy, Rogier A. Windhorst, Rosalia O’Brien, Seth H. Cohen, Delondrae Carter, Rolf Jansen, Scott Tompkins et al. « SKYSURF : Constraints on Zodiacal Light and Extragalactic Background Light through Panchromatic HST All-sky Surface-brightness Measurements : II. First Limits on Diffuse Light at 1.25, 1.4, and 1.6 μm ». Astronomical Journal 164, no 5 (4 octobre 2022) : 170. http://dx.doi.org/10.3847/1538-3881/ac8d02.

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Abstract We present the first results from the HST Archival Legacy project “SKYSURF.” As described in Windhorst et al., SKYSURF utilizes the large HST archive to study the diffuse UV, optical, and near-IR backgrounds and foregrounds in detail. Here, we utilize SKYSURF’s first sky-surface-brightness measurements to constrain the level of near-IR diffuse Extragalactic Background Light (EBL) in three near-IR filters (F125W, F140W, and F160W). This is done by comparing our preliminary sky measurements of >30,000 images to zodiacal light models, carefully selecting the darkest images to avoid contamination from stray light. Our sky-surface-brightness measurements have been verified to an accuracy of better than 1%, which when combined with systematic errors associated with HST, results in sky-brightness uncertainties of ∼ 2%–4% ≃ 0.005 MJy sr−1 in each image. When compared to the Kelsall et al. zodiacal model, an isotropic diffuse background of ∼30 nW m−2 sr−1 remains, whereas using the Wright zodiacal model results in no discernible diffuse background. Based primarily on uncertainties in the foreground model subtraction, we present limits on the amount of diffuse EBL of 29, 40, and 29 nW m−2 sr−1, for F125W, F140W, and F160W, respectively. While this light is generally isotropic, our modeling at this point does not distinguish between a cosmological origin or a solar system origin (such as a dim, diffuse, spherical cloud of cometary dust).
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Do, Tuan, Andrea M. Ghez, Mark R. Morris, Sylvana Yelda, Jessica R. Lu, Seth D. Hornstein et Keith Matthews. « Testing for periodicities in near-IR light curves of Sgr A* ». Journal of Physics : Conference Series 131 (1 octobre 2008) : 012003. http://dx.doi.org/10.1088/1742-6596/131/1/012003.

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Zimin, A. A., N. A. Zhevago et K. A. Samoilova. « 113 LOW POWER VISIBLE AND NEAR IR LIGHT IN CLINICAL ONCOLOGY ». Photodiagnosis and Photodynamic Therapy 5 (août 2008) : S37—S38. http://dx.doi.org/10.1016/s1572-1000(08)70115-7.

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Lapinski, Leszek, Igor Reva, Hanna Rostkowska, Anna Halasa, Rui Fausto et Maciej J. Nowak. « Conformational Transformation in Squaric Acid Induced by Near-IR Laser Light ». Journal of Physical Chemistry A 117, no 25 (13 juin 2013) : 5251–59. http://dx.doi.org/10.1021/jp402128g.

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FABIAN, J. « ChemInform Abstract : Polymethine Dyes with Light Absorption in the Near IR ». ChemInform 23, no 6 (22 août 2010) : no. http://dx.doi.org/10.1002/chin.199206313.

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Stacey, Oliver J., Benjamin D. Ward, Angelo J. Amoroso et Simon J. A. Pope. « Near-IR luminescent lanthanide complexes with 1,8-diaminoanthraquinone-based chromophoric ligands ». Dalton Transactions 45, no 15 (2016) : 6674–81. http://dx.doi.org/10.1039/c5dt04351d.

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Antokhin, Igor I., Anatol M. Cherepashchuk, Eleonora A. Antokhina et Andrey M. Tatarnikov. « Near-IR and X-Ray Variability of Cyg X-3 : Evidence for a Compact IR Source and Complex Wind Structures ». Astrophysical Journal 926, no 2 (1 février 2022) : 123. http://dx.doi.org/10.3847/1538-4357/ac4047.

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Abstract We study near-infrared (JHK) and X-ray light curves of Cyg X-3 obtained with the 2.5 m telescope of the Caucasian Mountain Observatory of MSU SAI and collected from the RXTE ASM and MAXI archives. The light curves in the X-ray and IR domains are strongly affected by irregular variations. However, the mean curves are remarkably stable and qualitatively similar in both domains. This means that the IR flux of the system originates not only from the free–free radiation of the Wolf–Rayet (WR) wind but also from a compact IR source located near the relativistic companion. The shape of the mean X-ray and IR light curves suggest the existence of two additional structures in the WR wind—a bow shock near the relativistic companion and a so-called “clumpy trail.” Modeling of the mean X-ray and IR light curves allowed us to obtain important system parameters: the orbital phase of the superior conjunction of the relativistic companion ϕ 0 = −0.066 ± 0.006, the orbital inclination angle i = 29.°5 ± 1.°2, and the WR mass-loss rate M ̇ = ( 0.96 ± 0.14 ) × 10 − 5 M ⊙ yr − 1 . By using relations between M ̇ and the rate of the period change and between M ̇ and the WR mass, we estimated the probable mass of the relativistic companion M C ≃ 7.2 M ⊙, which points toward the black hole hypothesis. However, this estimate is based on the assumption of a smooth WR wind. Considering the uncertainty associated with clumping, the mass-loss rate can be lower, which leaves room for the neutron star hypothesis.
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Nerella, Nadhamuni G., et James K. Drennen. « Depth-Resolved Near-Infrared Spectroscopy ». Applied Spectroscopy 50, no 2 (février 1996) : 285–91. http://dx.doi.org/10.1366/0003702963906456.

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While there is substantial evidence proving the success of transdermal drug delivery, there have been few accomplishments in the area of depth-resolved prediction of drug concentration during diffusion through a matrix. Such a method for noninvasive quantification of a diffusing species could assist in the development of new drugs, dosage forms, and penetration enhancers. Near-infrared depth-resolved measurements were accomplished by strategically controlling the amount of reflected light reaching the detectors using a combination of diaphragms with different-diameter apertures. Near-IR spectra were collected from a set of cellulose and Silastic® membranes to prove the possibility of depth-resolved near-IR measurements. Principal component regression was used to estimate the depth resolution of this method, yielding an average resolution of 31 μm. Further, to demonstrate depth-resolved near-IR spectroscopy in a practical in vitro system, we determined concentrations of salicylic acid (SA) in a hydrogel matrix during diffusion experiments carried out for up to three hours. An artificial-neural-network-based calibration model was developed which predicted SA concentrations accurately ( R2 = 0.993, SEP = 123 μg/mL).
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Ozdemir, Tugba, Ziya Kostereli, Ruslan Guliyev, Soydan Yalcin, Yavuz Dede et Engin U. Akkaya. « Ion responsive near-IR BODIPY dyes : two isomers, two different signals ». RSC Adv. 4, no 29 (2014) : 14915–18. http://dx.doi.org/10.1039/c4ra00989d.

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Trovato, Emanuela, Maria Letizia Di Pietro et Fausto Puntoriero. « Shining a New Light on an Old Game - An OsII-Based Near-IR Light Switch ». European Journal of Inorganic Chemistry 2012, no 25 (7 août 2012) : 3984–88. http://dx.doi.org/10.1002/ejic.201200787.

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Ghosh, Harekrishna, Ahmed Bouhekka et Thomas Bürgi. « An IR modulator based on the self-assembly of gold nanoparticles on germanium ». Phys. Chem. Chem. Phys. 16, no 36 (2014) : 19402–7. http://dx.doi.org/10.1039/c4cp02437k.

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Anderson, Erin D., Stacey Sova, Joseph Ivanic, Lisa Kelly et Martin J. Schnermann. « Defining the conditional basis of silicon phthalocyanine near-IR ligand exchange ». Physical Chemistry Chemical Physics 20, no 28 (2018) : 19030–36. http://dx.doi.org/10.1039/c8cp03842b.

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Marshall, J. E. A. « A simple cost-effective infra-red microscope for palynology ». Journal of Micropalaeontology 14, no 2 (1 octobre 1995) : 106. http://dx.doi.org/10.1144/jm.14.2.106.

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Abstract. It has long been known that objects which are opaque in transmitted white light can become translucent in infra-red (IR) light. Its application to palynology was shown by Leclercq (1933) who used an IR filter to cut out the visible light from the specimen coupled with an IR-sensitive film to capture the image. Although the significance of this development was recognized (Walton, 1935), it was never generally used since oxidative methods such as Schulze’s solution are normally successful in clearing exines. The exceptions are opaque palynomorphs from thermally over-mature rocks. Such assemblages have been studied with IR microscopy using either IR-sensitive film on partially cleared material (e.g. Tiwari & Schaarschmidt, 1975) or electronic IR imaging systems (Cramer & Diez, 1972).The technical sophistication and performance of IR imaging microscopes has recently improved significantly following their routine application for the internal imaging of silicon chips. However, such microscopes are designed for use in reflected light and also rather costly. In addition their design makes them difficult to routinely switch from brightfield transmitted light to IR light without risk of damaging their sensitive IR tube. This note describes a simplified IR microscope for transmitted light which shows how excellent images of opaque spores in the near-IR can be produced using the simplest palynological microscope.This IR microscope is based around an Olympus BHSM-IR system. This is fitted with a 100W quartz halogen bulb which is essential for providing the required level of IR illumination. However, the only specific IR corrected optics this. . .
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Graham, Gwenda J., Eiichi Tanaka, Alec M. De Grand, Rita G. Laurence, Kozo Hoshino, Roger J. Hajjar, John V. Frangioni et Robert Flaumenhaft. « Real-Time Imaging of Platelet-Rich Thrombi in Thick-Walled Blood Vessels Using Near-Infrared Fluorescence Light. » Blood 108, no 11 (16 novembre 2006) : 383. http://dx.doi.org/10.1182/blood.v108.11.383.383.

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Abstract Direct visualization of thrombus formation in real-time is limited by the fact that the vasculature is a closed system. Imaging of thrombi within arterioles and venules of small animals has been accomplished using fluorescent dyes that emit light in the visible spectrum. However, these agents are not able to penetrate large, thick-walled blood vessels and are therefore unable to detect thrombi in clinically important sites such as coronary, carotid, and femoral vessels. Near infrared light (NIR, 700–900 nm) demonstrates enhanced tissue penetration and less light scatter than visible light. By labeling platelets with IR-786, a heptamethine indocyanine-type fluorophore that emits NIR light, we have developed a reagent capable of detecting thrombi within thick-walled vessels of large animals. Optimal platelet loading occurred at 2 μM IR-786, resulting in an accumulation of 3 ×106 molecules/platelet. Normal platelet function was demonstrated by platelet aggregation and P-selectin surface expression studies. Clearance studies in 35 Kg Yorkshire pigs showed that IR-786-labeled platelets circulated for >2.5 h following infusion. IR-786-labeled platelets were next used in conjunction with an integrated NIR fluorescence video imaging system to digitally record thrombus formation in large vessels of pigs in real-time. Initially FeCl3 (oxidant injury) was utilized to induce clot formation in surgically exposed femoral arteries and IR-786-labeled platelets were shown to accumulate at the injury site with a signal to background ratio of 4.4±1.7. Thrombus growth was similarly detected and quantitated in coronary, carotid, and iliac arteries and veins. To assess potential applications of IR-786-labeled platelets for thrombus detection, thrombi were monitored in real-time, and quantified with respect to size and kinetics after electrocautery-induced injury to vessels, cutaneous incisions, intravascular stent insertion and introduction of embolic coils. Thrombolysis of formed IR-786-platelet-rich clots was also evaluated by the infusion of streptokinase and heparin, demonstrating dissolution of thrombi. Two color studies using IR-786-labeled platelets in conjunction with methylene blue, a near-infrared fluorescent blood pool agent used to assess vessel patency, showed that whilst the blood pool agent was more effective for assessing vessel patency, IR-786-labeled platelets were more sensitive for detecting and localizing thrombi within vessels. In addition, IR-786-labeled platelets were able to distinguish between actively growing and stabilized thrombi. IR-786-labeled platelets not only provide a useful tool to study mechanisms of thrombus formation but also afford a means of testing new anti-thrombotics and intravascular devices in vessels approximating the size of those in which clinically relevant thrombosis occurs. In addition, these pre-clinical studies indicate the utility of IR-786-labeled platelets as a contrast agent to detect intraoperative thrombosis, a complication of approximately 1–5% of vascular surgeries.
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Wang, Yuehui, Zhimin Zhou, Sixing Li, Han Zheng, Jiaxin Lu, Shuyue Wang, Jiahao Zhang, Ke Wang et Kaiwen Lin. « Near-Infrared-Light-Assisted Self-Healing Graphene-Thermopolyurethane Composite Films ». Polymers 14, no 6 (16 mars 2022) : 1183. http://dx.doi.org/10.3390/polym14061183.

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Graphene-thermopolyurethane (G-TPU) composite films were fabricated and the effects of the TPU initial concentration, characteristics of TPU, and graphene loading on the electrical, mechanical, thermal, infrared thermal response and near-infrared-light-assisted self-healing properties of the composite films were investigated in detail. The experimental results demonstrate that the comprehensive performances of the composite film are related to the initial concentration of the TPU solution and the characteristics of the TPU and the graphene loading. The composite film prepared from TPU solution with low initial concentration can have conductivity under the condition of low graphene content. However, the composite film prepared with appropriate initial concentration of TPU solution and high graphene loading is conducive to obtain high conductivity. After 60 s of near-infrared illumination, the temperature of the composite film first increases and then decreases with the increase in graphene loading until it reaches saturation. The near-infrared light thermal response of the composite film with high graphene loading is related to the initial concentration of TPU solution, while the near-IR thermal response of the composite film with low graphene loading is independent of the initial concentration of TPU. The surface micro-cracks of the composite film almost disappeared after 10 min of near-infrared illumination. The resistance of the conductive composite film increases after healed. The composite film prepared with low melting point TPU is more favorable to obtain high near-IR thermal self-healing efficiency.
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Komori, Naomitsu, Satish Jakkampudi, Ryusei Motoishi, Manabu Abe, Kenji Kamada, Ko Furukawa, Claudine Katan et al. « Design and synthesis of a new chromophore, 2-(4-nitrophenyl)benzofuran, for two-photon uncaging using near-IR light ». Chemical Communications 52, no 2 (2016) : 331–34. http://dx.doi.org/10.1039/c5cc07664a.

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Ueta, Toshiya, David Fong et Margaret Meixner. « Westbrook's Molecular Gun : Discovery of Near-Infrared Microstructures and Molecular Bullets in AFGL 618 ». Symposium - International Astronomical Union 209 (2003) : 122. http://dx.doi.org/10.1017/s0074180900208279.

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We present high-sensitivity near-IR images of a carbon-rich proto-planetary nebula, AFGL 618, obtained with the Infrared Camera and Spectrograph (IRCS) mounted on the 8.2m Subaru Telescope. The deep near-IR images have revealed “bullets” and “horns” extending farther out from the edges of the previously known bipolar nebulosities that consist of dust-scattered star light component and shock-excited line emission component. That these bullets and horns represent the positions from which [Fe II] IR lines arise is strongly suggested from the spatial coincidence between these near-IR microstructures and the optical collimated outflow structure observed by the recent HST/WFPC2 imaging, together with the previous detection of shock-excited, forbidden IR lines of atomic species at those locations. At these positions of the near-IR mincrostructures, we have also discovered CO clumps moving at > 200 km s-1 from our re-analysis of the existing 12CO J = 1 – 0 data obtained with the Berkeley-Illinois-Maryland Association (BIMA) interferometer array. These findings indicate that fast-moving CO clumps seem to be impinging upon the surrounding ambient circumstellar shell, thereby causing shocked emission regions which manifest themselves as the near-IR microstructures at the shock interface. To deepen our understanding of the connection between the near-IR microstructures and the CO outflow structure, we are currently conducting higher resolution observation in CO lines with the BIMA array.
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Rich, Evan A., John P. Wisniewski, Satoshi Mayama, Timothy D. Brandt, Jun Hashimoto, Tomoyuki Kudo, Nobuhiko Kusakabe et al. « NEAR-IR POLARIZED SCATTERED LIGHT IMAGERY OF THE DoAr 28 TRANSITIONAL DISK ». Astronomical Journal 150, no 3 (25 août 2015) : 86. http://dx.doi.org/10.1088/0004-6256/150/3/86.

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Allakhverdiev, K. R., M. Ö. Yetis, T. K. Baykara, S. M. T. Özbek et E. Yu Salaev. « Near IR laser light visualizators using nonlinear GaSe and other layered crystallites ». Laser Physics 21, no 3 (2 février 2011) : 598–600. http://dx.doi.org/10.1134/s1054660x11050021.

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Piyi Du, Gaorong Han et Zishang Ding. « Near IR sensitive liquid crystal light valve with hydrogenated amorphous silicon photoconductor ». IEEE Transactions on Electron Devices 43, no 2 (1996) : 360–62. http://dx.doi.org/10.1109/16.481741.

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Balaji, Babu, Bhabatosh Banik, Pijus K. Sasmal, Basudev Maity, Ritankar Majumdar, Rajan R. Dighe et Akhil R. Chakravarty. « Ferrocene-Conjugated Oxidovanadium(IV) Complexes as Potent Near-IR Light Photocytotoxic Agents ». European Journal of Inorganic Chemistry 2012, no 1 (2 novembre 2011) : 126–35. http://dx.doi.org/10.1002/ejic.201100836.

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Nani, Roger R., Alexander P. Gorka, Tadanobu Nagaya, Hisataka Kobayashi et Martin J. Schnermann. « Near-IR Light-Mediated Cleavage of Antibody-Drug Conjugates Using Cyanine Photocages ». Angewandte Chemie International Edition 54, no 46 (25 septembre 2015) : 13635–38. http://dx.doi.org/10.1002/anie.201507391.

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Nani, Roger R., Alexander P. Gorka, Tadanobu Nagaya, Hisataka Kobayashi et Martin J. Schnermann. « Near-IR Light-Mediated Cleavage of Antibody-Drug Conjugates Using Cyanine Photocages ». Angewandte Chemie 127, no 46 (22 septembre 2015) : 13839–42. http://dx.doi.org/10.1002/ange.201507391.

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Prasad, Puja, Imran Khan, Paturu Kondaiah et Akhil R. Chakravarty. « Mitochondria‐Targeting Oxidovanadium(IV) Complex as a Near‐IR Light Photocytotoxic Agent ». Chemistry – A European Journal 19, no 51 (13 novembre 2013) : 17445–55. http://dx.doi.org/10.1002/chem.201303487.

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Foteinopoulou, Stavroula, Ganga Chinna Rao Devarapu, Ganapathi S. Subramania, Sanjay Krishna et Daniel Wasserman. « Phonon-polaritonics : enabling powerful capabilities for infrared photonics ». Nanophotonics 8, no 12 (17 octobre 2019) : 2129–75. http://dx.doi.org/10.1515/nanoph-2019-0232.

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AbstractHere, we review the progress and most recent advances in phonon-polaritonics, an emerging and growing field that has brought about a range of powerful possibilities for mid- to far-infrared (IR) light. These extraordinary capabilities are enabled by the resonant coupling between the impinging light and the vibrations of the material lattice, known as phonon-polaritons (PhPs). These PhPs yield a characteristic optical response in certain materials, occurring within an IR spectral window known as the reststrahlen band. In particular, these materials transition in the reststrahlen band from a high-refractive-index behavior, to a near-perfect metal behavior, to a plasmonic behavior – typical of metals at optical frequencies. When anisotropic they may also possess unconventional photonic constitutive properties thought of as possible only with metamaterials. The recent surge in two-dimensional (2D) material research has also enabled PhP responses with atomically-thin materials. Such vast and extraordinary photonic responses can be utilized for a plethora of unusual effects for IR light. Examples include sub-diffraction surface wave guiding, artificial magnetism, exotic photonic dispersions, thermal emission enhancement, perfect absorption and enhanced near-field heat transfer. Finally, we discuss the tremendous potential impact of these IR functionalities for the advancement of IR sources and sensors, as well as for thermal management and THz-diagnostic imaging.
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Kawai, N. T., J. Sawatski et C. Lehner. « Analysis of microsamples with an FT-Raman microscope ». Proceedings, annual meeting, Electron Microscopy Society of America 50, no 2 (août 1992) : 1504–5. http://dx.doi.org/10.1017/s0424820100132157.

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Rapid developments in near-IR filter and detector technology have resulted in FT-Raman spectroscopy emerging as a powerful technique in both research and analytical laboratories. The more recent advances in FT-Raman instrumentation now emphasize the optimization of different sampling accessories, including microsampling techniques. Microscopes attached to conventional Raman spectrometers operating at visible wavelengths have already proven to be applicable to many problems of chemical analysis. However, the optimized combination of an optical microscope and a near-IR FT-Raman spectrometer currently enables the analysis of very small samples which would normally fluoresce with visible excitation. Such samples include polymer fibers and thin films, dyes on fabrics, and small biological samples.In FT-Raman microscopy, the microscope is coupled to the near-IR FT-Raman spectrometer via fiber optic cables. These cables transfer the Nd:YAG laser beam from the spectrometer to the microscope, and channel the scattered light back again to be modulated by the interferometer and measured by the high sensitivity near-IR detector.
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48

Law, Stephanie, Viktor Podolskiy et Daniel Wasserman. « Towards nano-scale photonics with micro-scale photons : the opportunities and challenges of mid-infrared plasmonics ». Nanophotonics 2, no 2 (1 avril 2013) : 103–30. http://dx.doi.org/10.1515/nanoph-2012-0027.

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AbstractSurface plasmon polaritons and their localized counterparts, surface plasmons, are widely used at visible and near-infrared (near-IR) frequencies to confine, enhance, and manipulate light on the subwavelength scale. At these frequencies, surface plasmons serve as enabling mechanisms for future on-chip communications architectures, high-performance sensors, and high-resolution imaging and lithography systems. Successful implementation of plasmonics-inspired solutions at longer wavelengths, in the mid-infrared (mid-IR) frequency range, would benefit a number of highly important technologies in health- and defense-related fields that include trace-gas detection, heat-signature sensing, mimicking, and cloaking, and source and detector development. However, the body of knowledge of visible/near-IR frequency plasmonics cannot be easily transferred to the mid-IR due to the fundamentally different material response of metals in these two frequency ranges. Therefore, mid-IR plasmonic architectures for subwavelength light manipulation require both new materials and new geometries. In this work we attempt to provide a comprehensive review of recent approaches to realize nano-scale plasmonic devices and structures operating at mid-IR wavelengths. We first discuss the motivation for the development of the field of mid-IR plasmonics and the fundamental differences between plasmonics in the mid-IR and at shorter wavelengths. We then discuss early plasmonics work in the mid-IR using traditional plasmonic metals, illuminating both the impressive results of this work, as well as the challenges arising from the very different behavior of metals in the mid-IR, when compared to shorter wavelengths. Finally, we discuss the potential of new classes of mid-IR plasmonic materials, capable of mimicking the behavior of traditional metals at shorter wavelengths, and allowing for true subwavelength, and ultimately, nano-scale confinement at long wavelengths.
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Moon, Kyung-Suk, Ji-Myung Bae, Sungho Jin et Seunghan Oh. « Infrared-Mediated Drug Elution Activity of Gold Nanorod-Grafted TiO2Nanotubes ». Journal of Nanomaterials 2014 (2014) : 1–8. http://dx.doi.org/10.1155/2014/750813.

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The purpose of this research was to prepare gold nanorod- (GNR-) grafted TiO2nanotubes by thiolactic acid treatment and evaluate remote-controlled drug elution and antibacterial activity by infrared (IR) light irradiation. Tetracycline used as an antibiotic was loaded into GNR-grafted TiO2nanotubes by using 2 w/v% polylactic acid solutions. A near-IR laser (830 nm) was used for remote-controlled IR light irradiation. Results of SEM, TEM, XRD, and EDX revealed that GNR chemically bonded to the whole surface of the TiO2nanotubes. An antibiotic release test revealed that on-off drug elution was triggered effectively by the photothermal effect of GNR grafted on TiO2nanotubes. Furthermore, an antibacterial agar zone test indicated that the annihilated zone ofStreptococcus mutansin the experimental group with IR light irradiation was significantly larger than that of the corresponding group without IR light irradiation (P<0.05). Therefore, GNR-grafted TiO2nanotubes would be expected to extend the limited usage of TiO2, which show photocatalytic activity only within the ultraviolet (UV) to IR region, thereby allowing the development of novel fusion technologies in the field of implant materials.
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van der Wel, Arjen. « The Rest-Frame Near-Infrared Colors and M/L of Early-Type Galaxies at z = 1 ». Proceedings of the International Astronomical Union 2, S235 (août 2006) : 288–91. http://dx.doi.org/10.1017/s1743921306006624.

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AbstractWe present the results of a study of the evolution of the optical and near-IR colors and mass-to-light ratios (M/L) of early-type galaxies from z~ 1 to the present. This exercise is relevant for studies that use photometry of galaxies to infer properties such as stellar masses and star formation histories through comparison with stellar population models. We have dynamical M/L for a sample of 20 early types at z~ 1 with velocity dispersions from deep optical spectroscopy and structural parameters (size and surface brightness) from high-resolution HST imaging. We compare those with 23 early-type galaxies in the Coma Cluster at z=0.02. For both samples rest-frame optical/near-IR photometry is available, from HST and Spitzer in the case of the z~ 1 sample. We find that the M/L evolves faster in the near-IR than expected from most stellar population models, and also that predictions from different models can differ significantly in the near-IR. As a consequence, there is a systematic uncertainty of a factor of two in stellar mass estimates from near-IR photometry for evolved, high-z galaxies. Optical colors provide a less biased indicator of the M/L. Agreement among the models is required before near-IR photometry can be used as a robust tool to estimate galaxy masses without systematic uncertainties.
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