scholarly journals Optical Heating Controlled With a Thermoplasmonic Metasurface

2021 ◽  
Vol 2015 (1) ◽  
pp. 012029
Author(s):  
E A Chernykh ◽  
A N Filippov ◽  
A M Alekseev ◽  
M A Makhiboroda ◽  
S S Kharintsev
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Thermal Response ◽  
Si Substrate ◽  
Laser Illumination ◽  
Liquid Crystal Films ◽  
Polymeric Blends ◽  
Cw Laser ◽  
Optical Heating ◽  
Crystal Films

Abstract We develop a photothermal technology to control optical heating of polymer and liquid crystal films through a refractory titanium nitride (TiN) metasurface. The metasurface represents an array of identical square-shaped TiN nanoantennas on a Si substrate. Upon CW laser illumination, a TiN nanoantenna experiences anomalous Joule heating at a plasmon resonance. A temperature rise provides a unique opportunity for locally probing phase transitions. In the case of heterogeneous PMMA thin films or polymeric blends, a controlled optical heating is needed to probe the glass transition temperature (Tg) of their constituents. Here, we model a controlled thermal response originating from the TiN nanoantenna under CW laser illumination by using FDTD/FEM methods.

Thermally stimulated third-order optical nonlinearity in Cd-doped CuO–PVA thin films under cw laser illumination

2015 ◽  
Vol 120 (2) ◽  
pp. 373-381 ◽  
Author(s):  
Y. S. Tamgadge ◽  
V. G. Pahurkar ◽  
S. S. Talwatkar ◽  
A. L. Sunatkari ◽  
G. G. Muley
Keyword(s):  
Thin Films ◽  
Optical Nonlinearity ◽  
Third Order ◽  
Laser Illumination ◽  
Cw Laser

scholarly journals Anomalous anti-Stokes Scattering in Amorphous Carbon Thin Films

2021 ◽  
Vol 2015 (1) ◽  
pp. 012131
Author(s):  
S V Saparina ◽  
A R Gazizov ◽  
S S Kharintsev
Keyword(s):  
Thin Films ◽  
Raman Scattering ◽  
Amorphous Carbon ◽  
Cross Sections ◽  
Temperature Dependent ◽  
Resonant Enhancement ◽  
Laser Illumination ◽  
Cw Laser ◽  
Scattering Cross Sections ◽  
Anti Stokes

Abstract This work is devoted to a study of temperature-dependent Raman scattering of amorphous carbon (a-C) thin films. An anomalous rise of the anti-Stokes intensity in respect to the Stokes intensity was observed. This result comes from the resonant enhancement of anti-Stokes scattering of defects of graphite-like crystals. The observed discrepancy is quantified through a coefficient, a, defined as a ratio of the anti-Stokes and Stokes scattering cross sections. Understanding the mechanism for anomalous enhancement of anti-Stokes scattering provides a way for correct probing the temperature of the a-C thin films exposed to cw laser illumination.

Third-order nonlinear optical properties of Mn doped ZnO thin films under cw laser illumination

2013 ◽  
Vol 35 (3) ◽  
pp. 431-439 ◽  
Author(s):  
K.K. Nagaraja ◽  
S. Pramodini ◽  
A. Santhosh Kumar ◽  
H.S. Nagaraja ◽  
P. Poornesh ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Zno Thin Films ◽  
Third Order ◽  
Laser Illumination ◽  
Cw Laser ◽  
Doped Zno ◽  
Mn Doped

Polarization analysis of induced gratings in nematic liquid crystal films

1984 ◽  
Vol 62 (1) ◽  
pp. 40-44 ◽  
Author(s):  
Y. G. Fuh ◽  
R. F. Code
Keyword(s):  
Thin Films ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Detailed Analysis ◽  
Probe Laser ◽  
Polarization Analysis ◽  
Liquid Crystal Films ◽  
Crystal Films ◽  
Quantitative Separation ◽  
Simple Measurement

A detailed analysis of classical diffraction on the optically induced phase gratings in thin films of the nematic liquid crystals 5CB, 6CB, and MBBA is presented. It enables a quantitative separation of thermal contributions from reorientational contributions to the gratings to be made by a simple measurement of the gratings' diffraction efficiency with a polarized probe laser.

Transmission Electron Microscopy studies of the vacancy ordering in YSI2-X thin films

1991 ◽  
Vol 49 ◽  
pp. 562-563
Author(s):  
F.-R. Chen ◽  
T. L. Lee ◽  
L. J. Chen
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Thin Films ◽  
Diffraction Pattern ◽  
Annealing Temperature ◽  
Lattice Mismatch ◽  
Si Substrate ◽  
Metal Thin Films ◽  
Transmission Electron ◽  
Vacancy Ordering

YSi2-x thin films were grown by depositing the yttrium metal thin films on (111)Si substrate followed by a rapid thermal annealing (RTA) at 450 to 1100°C. The x value of the YSi2-x films ranges from 0 to 0.3. The (0001) plane of the YSi2-x films have an ideal zero lattice mismatch relative to (111)Si surface lattice. The YSi2 has the hexagonal AlB2 crystal structure. The orientation relationship with Si was determined from the diffraction pattern shown in figure 1(a) to be and . The diffraction pattern in figure 1(a) was taken from a specimen annealed at 500°C for 15 second. As the annealing temperature was increased to 600°C, superlattice diffraction spots appear at position as seen in figure 1(b) which may be due to vacancy ordering in the YSi2-x films. The ordered vacancies in YSi2-x form a mesh in Si plane suggested by a LEED experiment.

Attractive mode force microscopy of chiral liquid crystal surfaces

1992 ◽  
Vol 50 (1) ◽  
pp. 268-269
Author(s):  
B.D. Terris ◽  
R. J. Twieg ◽  
C. Nguyen ◽  
G. Sigaud ◽  
H. T. Nguyen
Keyword(s):  
Liquid Crystal ◽  
Crystal Surfaces ◽  
Free Surfaces ◽  
Control Range ◽  
Force Microscopy ◽  
Liquid Crystal Films ◽  
Chiral Liquid Crystal ◽  
Crystal Films ◽  
Electrostatic Charging ◽  
And Shifts

We have used a force microscope in the attractive, or noncontact, mode to image a variety of surfaces. In this mode, the microscope tip is oscillated near its resonant frequency and shifts in this frequency due to changes in the surface-tip force gradient are detected. We have used this technique in a variety of applications to polymers, including electrostatic charging, phase separation of ionomer surfaces, and crazing of glassy films.Most recently, we have applied the force microscope to imaging the free surfaces of chiral liquid crystal films. The compounds used (Table 1) have been chosen for their polymorphic variety of fluid mesophases, all of which exist within the temperature control range of our force microscope.

Dynamics of tilted hexatic phases in liquid-crystal films

1991 ◽  
Vol 1 (11) ◽  
pp. 1363-1373 ◽  
Author(s):  
Jonathan V. Selinger
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Films ◽  
Crystal Films
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