مجال
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براءة اختراع + تميز دراسي و بحثي
+ جائزة تفوقية
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البحوث المنشورة
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البحث (1):
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عنوان البحث:
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Highly Flexible, Stretchable,
And Tunable Optical Diffusers With Mechanically Switchable Wettability
Surfaces
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رابط إلى البحث:
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Click here
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تاريخ النشر:
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24/05/2019
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موجز عن البحث:
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Highly stretchable and super-hydrophobic photonics provides a new
geometric degree of freedom for photonic system design and self-cleaning
applications. Here, we describe the design and experimental realization of
mechanically stretchable and tunable photonic diffusers. These intrinsically
designed diffusers (based on periodic arrays of cylindrical lenslets and
microtip) were made directly on elastomer material using laser ablation. The
dimensions of both the tips and the lenslet arrays play a critical role in
the distribution of illumination and wettability resistance. By stretching
the diffusers mechanically along the lenslet arrays, diffusion angle tuning
was achieved and also a reversible change between hydrophilic to super-hydrophobic
states. These multifunctional diffusers constitute an important step toward
integration with flexible materials or devices such as stretchable organic
light-emitting diodes and polymer light-emitting diodes.
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البحث (2):
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عنوان البحث:
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Laser Inscription Of Microfluidic Devices For Biological Assays
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رابط إلى البحث:
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Click here
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تاريخ النشر:
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14/03/2019
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موجز عن البحث:
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A rapid and direct CO2 laser ablation method was
developed to create superhydrophilic surfaces and arrays of
hydrophobic–superhydrophilic patterns for application in bioassays. Here, a
combination of superhydrophilic and hemiwicking wetting characteristics was
exploited to create microfluidic slides that were used as biological assays
that prevented cell aggregation. This feature allowed microscopic analyses to
be carried out at the individual cell level. This bioassay enabled control of
cell population in localized areas (15 cells cm–2). The device had
84% transparency, allowing direct fluorescence microscopy measurements in
transmission mode. High adhesion of aqueous fluids on superhydrophilic areas
surrounded by superhydrophobic boundaries provided selective retention and
confinement. The adhered droplets maintained retention under 180° substrate
tilt. These architectures provided rapid self-partitioning of the liquid into
an array of droplets. The hydrophobic–superhydrophilic patterned arrays may
have applications in microfluidic bioassays, high-throughput screening, and
medical diagnostics.
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البحث (3):
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عنوان البحث:
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Laser Inscription Of Pseudorandom Structures For Microphotonic
Diffuser Applications
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رابط إلى البحث:
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Click here
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تاريخ النشر:
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14/03/2018
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موجز عن البحث:
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Optical diffusers provide a solution for a variety of
applications requiring a Gaussian intensity distribution including imaging
systems, biomedical optics, and aerospace. Advances in laser ablation
processes have allowed the rapid production of efficient optical diffusers.
Here, we demonstrate a novel technique to fabricate high-quality glass
optical diffusers with cost-efficiency using a continuous CO2 laser.
Surface relief pseudorandom microstructures were patterned on both sides of
the glass substrates. A numerical simulation of the temperature distribution
showed that the CO2 laser drills a 137 μm hole in the glass
for every 2 ms of processing time. FFT simulation was utilized to design
predictable optical diffusers. The pseudorandom microstructures were
characterized by optical microscopy, Raman spectroscopy, and angle-resolved
spectroscopy to assess their chemical properties, optical scattering,
transmittance, and polarization response. Increasing laser exposure and the
number of diffusing surfaces enhanced the diffusion and homogenized the
incident light. The recorded speckle pattern showed high contrast with sharp
bright spot free diffusion in the far field view range (250 mm). A model of
glass surface peeling was also developed to prevent its occurrence during the
fabrication process. The demonstrated method provides an economical approach
in fabricating optical glass diffusers in a controlled and predictable
manner. The produced optical diffusers have application in fibre optics, LED
systems, and spotlights.
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البحث (4):
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عنوان البحث:
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Femtosecond Laser Ablation Of Transparent Microphotonic Devices
And Computer-Generated Holograms
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رابط إلى البحث:
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Click here
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تاريخ النشر:
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04/09/2017
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موجز عن البحث:
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Femtosecond laser ablation allows direct patterning of
engineering materials in industrial settings without requiring multistage
processes such as photolithography or electron beam lithography. However, femtosecond
lasers have not been widely used to construct volumetric microphotonic
devices and holograms with high reliability and cost efficiency. Here, a
direct femtosecond laser writing process is developed to rapidly produce
transmission 1D/2D gratings, Fresnel Zone Plate lenses, and
computer-generated holograms. The optical properties including light
transmission, angle-dependent resolution, and light polarization effects for
the microphotonic devices have been characterized. Varying the depth of the microgratings
from 400 nm to 1.5 μm allowed the control over their transmission intensity
profile. The optical properties of the 1D/2D gratings were validated through
a geometrical theory of diffraction model involving 2D phase modulation. The
produced Fresnel lenses had transmission efficiency of ∼60% at normal incidence and they
preserved the polarization of incident light. The computer-generated
holograms had an average transmission efficiency of 35% over the visible
spectrum. These microphotonic devices had wettability resistance of contact
angle ranging from 44° to 125°. These devices can be used in a variety of
applications including wavelength-selective filters, dynamic displays, fiber
optics, and biomedical devices.
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البحث (5):
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عنوان البحث:
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Femtosecond Laser Directed Fabrication Of Optical Diffusers
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رابط إلى البحث:
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Click here
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تاريخ النشر:
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24/03/2017
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موجز عن البحث:
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Optical diffusers are widely used in filament lamps, imaging
systems, display technologies, lasers, and Light Emitting Diodes (LEDs).
Here, a method for the fabrication of optical diffusers through femtosecond
laser machining is demonstrated. Float glass surfaces were ablated with
femtosecond laser light to form nanoscale ripples with dimensions comparable
to the wavelength of visible light. These structures produce highly efficient
and wide field of view diffusers. The machined patterns altered the average
surface roughness, with the majority of particles in the range of a few
hundred nanometers. The optical diffusion characteristic and a maximum
diffusion angle of near 172° was achieved with optimum machining parameters.
The transmission performance of the diffusers was measured to be ∼30% across the visible spectrum. The
demonstrated technique has potential for producing low-cost large area
optical devices. The process benefits from the flexibility of the laser
writing method and enables the production of custom optical diffusers.
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البحث (6):
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عنوان البحث:
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Nanosecond Pulsed Laser Texturing Of Optical Diffusers
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رابط إلى البحث:
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Click here
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تاريخ النشر:
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28/02/2017
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موجز عن البحث:
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High-quality optical glass diffusers have applications
in aerospace, displays, imaging systems, medical devices, and optical
sensors. The development of rapid and
accurate fabrication techniques is highly desirable for their
production. Here, a micropatterning method for the
fast fabrication of optical diffusers by means of
nanosecond pulsed laser ablation is demonstrated (λ=1064 nm, power=7.02, 9.36
and 11.7 W and scanning speed=200 and 800 mm s-1). The experiments
were carried out by point-to-point texturing of a glasssurface in
spiral shape. The laser machining parameters, the number of pulses and their
power had significant effect on surface features. The optical
characteristics of the diffusers were characterized at different scattering angles.
The features of the microscale structures influenced average roughness from
0.8 μm to 1.97 μm. The glass diffusers scattered light at
angles up to 20° and their transmission efficiency were measured up
to ∼97% across the visible spectrum. The
produced optical devices diffuse light less but do so with
less scattering and energy losses as compared to opal
diffusing glass. The presented fabricationmethod can be
applied to any other transparent material to create optical
diffusers. It is anticipated that the optical diffusers presented
in this work will have applications in the production of LED spotlights and
imaging devices.
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المؤتمرات
العلمية:
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المؤتمر (1):
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عنوان المؤتمر:
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Photon 16
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تاريخ الإنعقاد:
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05/09/2016
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مكان الإنعقاد:
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Leeds,
UK
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طبيعة المشاركة:
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Poster
presentation
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عنوان المشاركة:
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Holographic Ink-Based Optical Device
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ملخص المشاركة:
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Hologram
are used for implementation in optical devices, sensors fabrication,
security, data storing and light trapping. The fabrication of photonic
devices over large areas remains expertise-dependent, inaccurate and
high-cost, limiting their widespread use in practical applications and
consumer products. Here, we introduced ink as an optical material for the
diffraction optics and demonstrated a rapid, efficient and low cost method
for imprinting surface grating ink hologram by laser ablation using a single
pulse laser (532nm). The fabrication process of holograms takes only few
minutes. The holographic nanopatterns (gratings) has been modelled
computationally and experimentally. A well-localized 2D diffraction pattern
was observed by illumination of red (λ=632 nm), green (λ=532 nm) and blue (λ=
405 nm) light source. Symmetrical diffraction intensity distribution were
obtained via the angular-resolved measurement. We also demonstrate the
utilities of the laser ablation method and ink material by creating
holographic grating, 2D pattern, optical diffuser and Fresnel zone plate
lens- all based on same ink template. We anticipate that ink as optical
materials will find good application in nano-scale and low cost printable
optical devices.
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الرابط:
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Click here
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المؤتمر (2):
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عنوان المؤتمر:
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Photon 16
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تاريخ الإنعقاد:
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05/09/2016
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مكان الإنعقاد:
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Leeds,
UK
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طبيعة المشاركة:
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Poster
presentation
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عنوان المشاركة:
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Ultrashort Pulses Laser Directed Manufacturing Of Glass Diffuser
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ملخص المشاركة:
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High-quality
optical glass diffusers have applications in aerospace, displays, imaging
systems, medical devices, and optical sensors. The development of rapid and
accurate fabrication techniques is highly desirable for their production.
Here, a micropatterning method for the fast fabrication of optical diffusers
by means of nanosecond pulsed laser ablation is demonstrated (λ=1064 nm,
power= 7.02, 9.36 and 11.7 W and scanning speed=200 and 800 mm s-1). The
experiments were carried out by point-to-point texturing a glass surface in
spiral shape. The laser machining parameters, the number of pulses and their
power had significant effect on surface features. The optical characteristics
of the diffusers were characterized at different scattering angles. The features
of the microscale structures influenced average roughness, starting in the
range of 0.8µm and increasing up to the 1.97µm. The glass diffusers scatter
light at angles up to 20° and their transmission efficiency were measured up
to ~97% across the visible spectrum. The produced optical devices diffuse
light less but do so with less scattering and energy losses compared to opal
diffusing glass. The presented fabrication method can be applied on any other
transparent material to create optical diffusers. It is anticipated that the
optical diffusers presented in this work will have applications in the
production of LED spotlights and imaging devices.
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الرابط:
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Click here
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المؤتمر (3):
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عنوان المؤتمر:
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The 5th Mechanical Engineering Symposium
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تاريخ الإنعقاد:
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02/03/2016
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مكان الإنعقاد:
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Birmingham,
UK
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طبيعة المشاركة:
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Oral
presentation
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عنوان المشاركة:
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Laser Directed Manufacturing Of Optical Diffuser
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ملخص المشاركة:
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The
glass diffusers are widely used as an important component in optics industry.
This study focuses on the texturing of the glass surface using femtosecond
laser. By performing the optical measurements by means of automated
rotational stage, the angular distribution of the light and its transmission
efficiency is achieved. Also the laser machining parameters such as hatch
direction, scanning speed, frequency, power rate and hatch pitch are varied
in order to optimize the efficiency of light diffusion. It is shown that the
diffusion angle can reach to 172˚ by the proposed process
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المؤتمر (4):
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عنوان المؤتمر:
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Nanotech 2017
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تاريخ الإنعقاد:
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04/12/2017
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مكان الإنعقاد:
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Dubai,
UAE
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طبيعة المشاركة:
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Oral
Presentation
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عنوان المشاركة:
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Laser Inscription Of Pseudorandom Structures For Microphotonic
Diffuser Applications
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ملخص المشاركة:
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Advances
in laser ablation processes has allowed rapidly producing efficient optical
diffusers. Here, we demonstrate a novel technique to fabricate high-quality
glass optical diffusers with cost-efficiency using a continuous CO2 laser.
Surface relief pseudorandom microstructures were patterned on both sides of
the glass substrates. Increasing laser exposures and the number of the
diffusing surfaces enhanced the diffusion and homogenized the incident light.
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الرابط:
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Click here
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المؤتمر (5):
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عنوان المؤتمر:
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PERCAT LES & EPS Research Conference
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تاريخ الإنعقاد:
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01/06/2016
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مكان الإنعقاد:
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Birmingham,
UK
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طبيعة المشاركة:
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Poster presentation
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عنوان المشاركة:
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Ultrashort Pulses Laser Manufacturing Of Optical Diffuser
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ملخص المشاركة:
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This
study demonstrates on the inscribing of the glass surface using ultrashort
pulses laser. By performing the optical measurements by means of automated
rotational stage, the angular distribution of the light and its transmission
efficiency is achieved. Also the laser machining parameters such as hatch
direction, scanning speed, frequency, power rate and hatch pitch are varied
in order to optimize the efficiency of light diffusion. It is shown that the
diffusion angle can reach to 172˚ by the proposed process.
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جوائز التكريم:
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الجائزة (1):
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مسمى الجائزة:
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Certificate Of Recognition For Scientific
Excellence
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الجهة المانحة:
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American Chemical Society Publications
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تاريخ الجائزة:
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01/05/2018
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مجال التكريم:
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Helped advance scientific
excellence and made ACS the most trusted, most cited, and most read
publisher.
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براءة اختراع:
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الإختراع (1):
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مسمى الإختراع:
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Method For Producing Optical
Diffusers Using Microstructures Of Mandarin Peel
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الجهة المانحة:
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Saudi Patent Office
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تاريخ تسجيل الإختراع:
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19/09/2018
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مجال الإختراع:
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Manufacturing
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الإختراع (2):
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مسمى الإختراع:
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Method For Producing An Optical
Diffusers By Micro In Printing Paper
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الجهة المانحة:
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Saudi Patent Office
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تاريخ تسجيل الإختراع:
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13/02/2019
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مجال الإختراع:
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Manufacturing
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