IR absorption enhancement for physisorbed methanol on Ag island films deposited on the oxidized and H-terminated Si(111) surfaces: effect of the metal surface morphology

1999 ◽  
Vol 69 (1) ◽  
pp. 77-80 ◽  
Author(s):  
T. Wadayama ◽  
O. Suzuki ◽  
K. Takeuchi ◽  
H. Seki ◽  
T. Tanabe ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Metal Surface ◽  
Absorption Enhancement ◽  
Ir Absorption ◽  
Island Films

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.

Effect of metal surface morphology on nano-structured patterns induced by a femtosecond laser pulse and its experimental verification

2018 ◽  
Vol 16 (7) ◽  
pp. 073202
Author(s):  
Haiying Song Haiying Song ◽  
Shengwang Tan Shengwang Tan ◽  
Elshaimaa M. Emara Elshaimaa M. Emara ◽  
Yanjie Zhang Yanjie Zhang ◽  
Shibing Liu Shibing Liu ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Surface Morphology ◽  
Metal Surface ◽  
Femtosecond Laser Pulse ◽  
Experimental Verification

Experimental demonstration of mid-IR absorption enhancement in single layer CVD graphene

2020 ◽  
Vol 45 (14) ◽  
pp. 3861 ◽  
Author(s):  
Abedin Nematpour ◽  
Nicola Lisi ◽  
Rosa Chierchia ◽  
Maria Luisa Grilli
Keyword(s):  
Single Layer ◽  
Absorption Enhancement ◽  
Ir Absorption ◽  
Experimental Demonstration ◽  
Cvd Graphene

Infrared Vision Using an Uncooled Thermo-Opto-Mechanical Camera: Design, Microfabrication, and Performance

1999 ◽  
Author(s):  
M. Mao ◽  
T. Perazzo ◽  
O. Kwon ◽  
Y. Zhao ◽  
A. Majumdar ◽  
...  
Keyword(s):  
Optical Design ◽  
Thermomechanical Analysis ◽  
Absorption Enhancement ◽  
Geometrical Shape ◽  
Ir Absorption ◽  
Residual Tensile Stress ◽  
Ir Radiation ◽  
Ir Camera ◽  
Optical Readout ◽  
And Performance

Abstract An uncooled infrared (IR) camera that is based on thermomechanical sensing and visible optical readout has been developed. The system contains a focal plane array (FPA) consisting of bimaterial cantilever beams made of silicon nitride (SiNx) and gold (Au) in each pixel. Absorption of incident IR radiation in the 8–14 μm wavelength range by SiNx in each cantilever beam raises its temperature, resulting in proportional deflection due to mismatch in thermal expansion of the two cantilever materials. To maximize the thermal performance, the conductance of each pixel was reduced to about five times of the radiation conductance. Based on thermomechanical analysis, the geometrical shape of the pixels were designed to maximize the cantilever sensitivity within the constraints of the pixel size and layout. Microfabrication of stress-balanced bimaterial cantilevers was achieved by varying the silicon concentration along the thickness of the SiNx films in order to balance the residual tensile stress in the Au film and the Cr adhesion layer between Au and SiNx. The optical design of each pixel was based on IR properties of the cantilever materials, IR absorption enhancement due to resonance cavity formation, as well as visible optics of deformable diffraction gratings. The latter formed the foundation for two different optical readout techniques that were both used for IR imaging. The results suggest that objects at temperatures as low as 30 °C can be imaged with the best noise-equivalent temperature difference (NETD) in the range of 2–5 K. It is estimated that further improvements that are currently being pursued can improve NETD to about 10 mK.

Crucial Role of Metal Surface Morphology in Photon Emission from a Tunnel Junction at Ambient Conditions

2019 ◽  
Vol 123 (14) ◽  
pp. 8813-8817 ◽  
Author(s):  
Vitaliy A. Shkoldin ◽  
Dmitry V. Permyakov ◽  
Konstantin S. Ladutenko ◽  
Mikhail V. Zhukov ◽  
Aleksandr A. Vasiliev ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Metal Surface ◽  
Tunnel Junction ◽  
Crucial Role ◽  
Photon Emission ◽  
Ambient Conditions

Metal Surface Morphology Characterization Using Laser Scatterometry

1990 ◽  
Vol 181 ◽  
Author(s):  
S. M. Gaspar ◽  
K. C. Hickman ◽  
J. R. McNeil ◽  
R. D. Jacobson ◽  
G. P. Lindauer ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Spectral Density ◽  
Power Spectral Density ◽  
Metal Surface ◽  
Power Spectral ◽  
Morphology Characterization ◽  
Surface Statistics

ABSTRACTWe have applied angle-resolved laser scatterometry to characterize the morphology of metals deposited under various conditions. Scatterometry is a rapid, noncontact and nondestructive diagnostic which yields surface statistics including rms roughness and power spectral density of the microstructure.

scholarly journals A Facile Method to Prepare a Hydrophilic/Hydrophobic Metal Surface by Peptide

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1289
Author(s):  
Chunying Ma ◽  
Chengqing Yuan ◽  
Pan Cao
Keyword(s):  
Stainless Steel ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Surface Morphology ◽  
Fourier Transform Infrared Spectroscopy ◽  
Metal Surface ◽  
Metal Binding ◽  
Steel Surface ◽  
Stainless Steel Surface ◽  
Binding Peptide

A facile method to prepare a hydrophilic/hydrophobic metal surface by metal-binding peptide was proposed in this article. Metal-binding peptide sequenced NLNPNTASAMHV was taken as the target peptide to interact with stainless steel. The surface morphology, roughness and Fourier-Transform Infrared spectroscopy (FTIR) showed that some changes occurred on the modified stainless steel surface. Not only were the surfaces coarser but also some organic groups appeared on the modified sample surfaces. By comparing the CAs of all the samples, the most suitable concentration of peptide and treating time were determined. A new and facile way to endow some metals surfaces with hydrophobicity or hydrophilicity has been developed, which is useful especially for antibiofouling.

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