Plasmon-assisted interaction of Si with light, for cancer hyperthermia and electromagnetic energy harvest

2020 ◽  
Vol 92 (2) ◽  
pp. 20101
Author(s):  
Behnam Kheyraddini Mousavi ◽  
Morteza Rezaei Talarposhti ◽  
Farshid Karbassian ◽  
Arash Kheyraddini Mousavi
Keyword(s):  
Silicon Nanowires ◽  
Metallic Nanoparticles ◽  
Near Infrared ◽  
Optical Transition ◽  
Electromagnetic Energy ◽  
Energy Harvest ◽  
Absorption Enhancement ◽  
Ir Absorption ◽  
Absorption Mechanism ◽  
Near Ir

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.

Electrochromic properties of novel octa-pinene substituted double-decker Ln(iii) (Ln = Eu, Er, Lu) phthalocyanines with distinctive near-IR absorption

2015 ◽  
Vol 3 (13) ◽  
pp. 3072-3080 ◽  
Author(s):  
Wei Zheng ◽  
Bei-Bei Wang ◽  
Jian-Cheng Lai ◽  
Cheng-Zhang Wan ◽  
Xin-Rong Lu ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Near Infrared ◽  
External Potential ◽  
Infrared Range ◽  
Ir Absorption ◽  
Electrochromic Properties ◽  
Near Ir ◽  
Double Decker ◽  
Spectral And Electrochemical Properties ◽  
Near Infrared Range

The introduction of pinene groups into lanthanide(iii) double-decker phthalocyanines results in excellent solubility as well as nontrivial spectral and electrochemical properties. Upon external potential, the new lanthanide(iii) double-decker phthalocyanine complexes show electrochromic properties at both visible and near infrared range.

scholarly journals Oriented zinc oxide nanorods: A novel saturable absorber for lasers in the near-infrared

2018 ◽  
Vol 9 ◽  
pp. 2730-2740 ◽  
Author(s):  
Pavel Loiko ◽  
Tanujjal Bora ◽  
Josep Maria Serres ◽  
Haohai Yu ◽  
Magdalena Aguiló ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Near Infrared ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Saturable Absorption ◽  
Ir Absorption ◽  
Saturable Absorbers ◽  
Saturation Intensity ◽  
Nanosecond Pulses ◽  
Near Ir

Zinc oxide (ZnO) nanorods (NRs) oriented along the crystallographic [001] axis are grown by the hydrothermal method on glass substrates. The ZnO NRs exhibit a broadband (1–2 µm) near-IR absorption ascribed to the singly charged zinc vacancy VZn −1. The saturable absorption of the ZnO NRs is studied at ≈1 µm under picosecond excitation, revealing a low saturation intensity, ≈10 kW/cm2, and high fraction of the saturable losses. The ZnO NRs are applied as saturable absorbers in diode-pumped Yb (≈1.03 µm) and Tm (≈1.94 µm) lasers generating nanosecond pulses. The ZnO NRs grown on various optical surfaces are promising broadband saturable absorbers for nanosecond near-IR lasers in bulk and waveguide geometries.

scholarly journals Synthesis and Characterization of hybrid Organic–inorganic near infrared Absorption OV-POSS-Squaraine-amine and improve the Properties

2019 ◽  
Vol 4 (1) ◽  
Keyword(s):  
Near Infrared ◽  
Molecular Design ◽  
Low Cost ◽  
Solution Process ◽  
Squaric Acid ◽  
Ir Absorption ◽  
Near Ir ◽  
Squaraine Dye ◽  
Scalable Synthesis ◽  
Composition Properties

Recently Squaraine dye have been receiving the interest of researchers due to its improved solution process ability, scalable synthesis, tunable chemical and physical properties via molecular design and of course its low cost. However, problems of compatibility and wet-ability have limited broad application of Squaraine dye. In this study, we used octavinyl-polyhedral oligomeric silsesquioxane OV-POSS to prevent all these problems and to enhance the dye properties. This is the first time to designe a novel near-IR absorption multifunctional materials over a wide PH (2- 9) with excellent properties of compatibility. A novel system of organic-inorganic hybrids optical material near-IR was prepared by OV-POSS with 6-Bromoquanaldine and Squaric acid to get system1 of (OV-POSS-Squaraine) then reacted with 4-bromaniline to get our last system OV-POSS-Squaraine-amine. Our structure, composition, properties were characterized and evaluated by 1 HNMR spectrum, contact angle and FE-SEM. we believe that the novelty would open new path for more synthesis and applications.

Near IR Absorption in Heavily Doped Silicon – An Empirical Approach

2000 ◽  
Author(s):  
R. Aaron Falk
Keyword(s):  
Near Infrared ◽  
Empirical Approach ◽  
Ir Absorption ◽  
Free Carrier Absorption ◽  
Ir Radiation ◽  
Laser Probing ◽  
Near Ir ◽  
Carrier Absorption ◽  
Heavily Doped ◽  
Heavy Doping

Abstract Backside failure analysis techniques rely heavily on transmission of near infrared (IR) radiation through the silicon substrate. This statement applies both to emission techniques and active laser probing. Heavy doping of substrates causes them to become highly absorptive in the near IR due to band gap shifts, which effects phonon-assisted absorption, and to free-carrier absorption. Substrate thinning is often required to allow adequate optical transmission. This paper describes an empirical approach to determining the absorption coefficient in a heavily doped substrate and use of the coefficient in determining the amount of substrate thinning required.

scholarly journals Various Aspects of the Spectroscopy of PAHs (Polycyclic Aromatic Hydrocarbons)

2002 ◽  
Vol 12 ◽  
pp. 44-47
Author(s):  
Philippe Bréchignac
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Charge State ◽  
Aromatic Hydrocarbons ◽  
Near Infrared ◽  
Spectroscopic Properties ◽  
Infrared Emission ◽  
Ir Absorption ◽  
Near Ir ◽  
Polycyclic Aromatic ◽  
Infrared Intensities

AbstractThe exploitation of the recent observations (in particular by ISO) of the near infrared emission bands (UIBs) requires a good knowledge of the spectroscopic properties of the main proposed carriers, i.e. the Polycyclic Aromatic Hydrocarbons, which are expected to act as efficient UV/visible to infrared free-flying light converters.The charge state of the interstellar PAHs strongly affects their spectroscopy. The laboratory study of the electronic transitions of PAH cations in the gas phase enables to address important questions, like their possible contribution to the Diffuse Interstellar Bands (visible and near-IR absorption), and the mechanism responsible for electronic to vibrational intramolecular energy conversion.Microcanonical simulations based on hybrid quantum/classical theoretical methods reveal how strongly affected are the infrared intensities by both the charge state and the vibrational temperature.

Near-IR Absorption Spectra for the Buckminsterfullerene Anions: An Experimental and Theoretical Study

1992 ◽  
Author(s):  
Del R. Lawson ◽  
Daniel L. Feldheim ◽  
Colby A. Foss ◽  
Peter K. Dorhoug ◽  
C. M. Elliott
Keyword(s):  
Absorption Spectra ◽  
Theoretical Study ◽  
Ir Absorption ◽  
Near Ir ◽  
Ir Absorption Spectra

scholarly journals Regulating disordered plasmonic nanoparticles into polarization sensitive metasurfaces

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shulei Li ◽  
Mingcheng Panmai ◽  
Shaolong Tie ◽  
Yi Xu ◽  
Jin Xiang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Metallic Nanoparticles ◽  
Near Infrared ◽  
Optical Memory ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Optical Diffraction ◽  
Plasmonic Nanoparticles ◽  
Direct Laser

Abstract Metasurfaces composed of regularly arranged and deliberately oriented metallic nanoparticles can be employed to manipulate the amplitude, phase and polarization of an incident electromagnetic wave. The metasurfaces operating in the visible to near infrared spectral range rely on the modern fabrication technologies which offer a spatial resolution beyond the optical diffraction limit. Although direct laser writing is an alternative to the fabrication of nanostructures, the achievement of regular nanostructures with deep-subwavelength periods by using this method remains a big challenge. Here, we proposed and demonstrated a novel strategy for regulating disordered plasmonic nanoparticles into nanogratings with deep-subwavelength periods and reshaped nanoparticles by using femtosecond laser pulses. The orientations of the nanogratings depend strongly on the polarization of the femtosecond laser light. Such nanogratings exhibit reflection and polarization control over the reflected light, enabling the realization of polarization sensitive optical memory and color display with high spatial resolution and good chromacity.

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