Spider Silk: The Mother Nature`s Biological Superlens
... To summarise, this paper verified that the minor ampullate spider silk, spun from the Nephila edulis spider, has the properties to perform as an optical superlens by utilising photonic nanojets to carry the surface information at a highspatial-frequency, which can resolve 100-nm objects and patterns ...
... To summarise, this paper verified that the minor ampullate spider silk, spun from the Nephila edulis spider, has the properties to perform as an optical superlens by utilising photonic nanojets to carry the surface information at a highspatial-frequency, which can resolve 100-nm objects and patterns ...
Multi-photon absorption and third-order
... ranged from 38 to 123 µm for different wavelengths. As shown, α3 and α4 present nonlinear absorption coefficients for 3PA and 4PA. The peak intensity I00 at the sample is determined as I00 = laser_power / [(πω02) × pulse_repetitions × pulse_width] × 40%, due to Fresnel reflection and back scattering ...
... ranged from 38 to 123 µm for different wavelengths. As shown, α3 and α4 present nonlinear absorption coefficients for 3PA and 4PA. The peak intensity I00 at the sample is determined as I00 = laser_power / [(πω02) × pulse_repetitions × pulse_width] × 40%, due to Fresnel reflection and back scattering ...
Minimized speckle noise in lens-less holographic projection by pixel
... persistent difficulties with laser eye-safety and strong image flickering. On the other hand the holographic projection provides stable images formed by strongly divergent wavefronts, which ensures a completely safe operation. From the point of view of energetic efficiency, the utilization of 8-bit ...
... persistent difficulties with laser eye-safety and strong image flickering. On the other hand the holographic projection provides stable images formed by strongly divergent wavefronts, which ensures a completely safe operation. From the point of view of energetic efficiency, the utilization of 8-bit ...
Negative refraction - Condensed Matter Theory group
... consistent with a negative refractive index, and it is now common to use the term ‘negatively refracting’ to describe these double negative materials. In view of the role of causality in guiding us to physically correct solutions, we shall henceforth prefer to write ε → −1 rather than ε = −1 , with ...
... consistent with a negative refractive index, and it is now common to use the term ‘negatively refracting’ to describe these double negative materials. In view of the role of causality in guiding us to physically correct solutions, we shall henceforth prefer to write ε → −1 rather than ε = −1 , with ...
Document
... through which the ray travels, and a less dense medium (air). There is no phase change on reflection from such an interface, just as there is no phase change when a wave on a string is reflected from a free end of the string. The second ray is reflected at an interface between an optically less dens ...
... through which the ray travels, and a less dense medium (air). There is no phase change on reflection from such an interface, just as there is no phase change when a wave on a string is reflected from a free end of the string. The second ray is reflected at an interface between an optically less dens ...
OPTIMIZATION OF THE FIBER-OPITC FABRY-PEROT INTERFEROMETER CONSTRUCTION Małgorzata Jędrzejewska-Szczerska,
... In this work the method of optimization of the fiber-optic, Fabry-Perot interferometer construction has been presented. The low-finesse Fabry-Perot interferometer working in reflective mode has been investigated. This interferometer was chosen for optimization because of broad range of it potential ...
... In this work the method of optimization of the fiber-optic, Fabry-Perot interferometer construction has been presented. The low-finesse Fabry-Perot interferometer working in reflective mode has been investigated. This interferometer was chosen for optimization because of broad range of it potential ...
Materials processing with a tightly focused femtosecond laser vortex
... references therein). So far, none of the proposed compensation techniques have been tested or used in laser micromachining. Recently we have synthesized high-quality doublecharge femtosecond vortex beams by using polarization singularities associated with the beam propagation in uniaxial birefringen ...
... references therein). So far, none of the proposed compensation techniques have been tested or used in laser micromachining. Recently we have synthesized high-quality doublecharge femtosecond vortex beams by using polarization singularities associated with the beam propagation in uniaxial birefringen ...
Optical Metrology - Bogazici University Physics Department
... FTP’s main advantage is that it uses only a single image to extract profile of an object. In other techniques, 3 or 4 images are required. ...
... FTP’s main advantage is that it uses only a single image to extract profile of an object. In other techniques, 3 or 4 images are required. ...
Experimental study on Extremely-Thin-Body In0
... Analysis of strain relaxation of SiGe layer The amount of strain in the SiGe layer in the fabricated device was evaluated by Raman spectroscopy. It is well known that the biaxial strain is partially relaxed when a biaxially strained layer is etched into a narrow mesa with submicron width such as op ...
... Analysis of strain relaxation of SiGe layer The amount of strain in the SiGe layer in the fabricated device was evaluated by Raman spectroscopy. It is well known that the biaxial strain is partially relaxed when a biaxially strained layer is etched into a narrow mesa with submicron width such as op ...
Looking through walls and around corners with
... analogues in time-reversal techniques in acoustics and radiofrequency electromagnetic waves . Related notions for imaging through random media in optics can be traced back to phase-conjugation/phase21-25 subtraction holographic techniques . These, however, require coherent laser sources and interfer ...
... analogues in time-reversal techniques in acoustics and radiofrequency electromagnetic waves . Related notions for imaging through random media in optics can be traced back to phase-conjugation/phase21-25 subtraction holographic techniques . These, however, require coherent laser sources and interfer ...
Optical Measurements of Interface Acoustic Waves Guided by the
... a Stoneley wave for the slip contact conditions. The fact that the two solids are transparent allows us to explore the dilatation field on each side of the interface. Figure 3 shows the typical time signals measured on both sides. The measured value of the wave velocity is 3400 mIs, equal, within e ...
... a Stoneley wave for the slip contact conditions. The fact that the two solids are transparent allows us to explore the dilatation field on each side of the interface. Figure 3 shows the typical time signals measured on both sides. The measured value of the wave velocity is 3400 mIs, equal, within e ...
Fast Light, Slow Light and Optical Precursors: What
... to realize that there are many quantities that can be introduced to describe the speed at which a light pulse moves through a material system.2 This confusing situation arises from the fact that a pulse propagating through any material system will experience some level of distortion — e.g., it sprea ...
... to realize that there are many quantities that can be introduced to describe the speed at which a light pulse moves through a material system.2 This confusing situation arises from the fact that a pulse propagating through any material system will experience some level of distortion — e.g., it sprea ...
The Analysis of Liquid Crystal Phases using Polarized Optical
... the non-plarized white light are splitted into two ray as it passes through the prism. The one travels out of the prism is called ordinary ray, and the other one is called extraordinary ray. So if we have a birefringent specimen located between the polarizer and analyzer, the initial light will be s ...
... the non-plarized white light are splitted into two ray as it passes through the prism. The one travels out of the prism is called ordinary ray, and the other one is called extraordinary ray. So if we have a birefringent specimen located between the polarizer and analyzer, the initial light will be s ...
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)
... hundreds of microns can be successfully held by a beam (or beams) of light. Optical tweezers is a type of optical micro-manipulation and micro-fabrication system. Optical tweezers are scientific instruments that use a highlyfocused laser beam to trap, move and rotate microscopic individual dielectri ...
... hundreds of microns can be successfully held by a beam (or beams) of light. Optical tweezers is a type of optical micro-manipulation and micro-fabrication system. Optical tweezers are scientific instruments that use a highlyfocused laser beam to trap, move and rotate microscopic individual dielectri ...
The Basic Idea
... Figure 3.1: This diagram illustrates the basic idea of a Michelson interferometer. Light, in this case from a laser, enters from the left. The beam is split into two perpendicular paths, which are then reflected back toward the beam splitter using mirrors. The beam is then split again, and part of ...
... Figure 3.1: This diagram illustrates the basic idea of a Michelson interferometer. Light, in this case from a laser, enters from the left. The beam is split into two perpendicular paths, which are then reflected back toward the beam splitter using mirrors. The beam is then split again, and part of ...
PDF File
... of facilitating plasmon resonances and enhancing near electromagnetic field is to put multiple nanometallic particles close to each other or to compile them into periodic structures. For infinitely long noble-metal scatterers having one-dimensional periodicity, fruitful results have been reported upon ...
... of facilitating plasmon resonances and enhancing near electromagnetic field is to put multiple nanometallic particles close to each other or to compile them into periodic structures. For infinitely long noble-metal scatterers having one-dimensional periodicity, fruitful results have been reported upon ...
High accurate metrology on large surface areas with low reflectivity
... range. As seen in figure 4, the firmware program implements a hysteresis by only sending a new move command to the axis, when the difference between the required position and the actual position is greater than a certain threshold. This ensures that the axis is not introducing any vibration due to t ...
... range. As seen in figure 4, the firmware program implements a hysteresis by only sending a new move command to the axis, when the difference between the required position and the actual position is greater than a certain threshold. This ensures that the axis is not introducing any vibration due to t ...
Observation of subluminal twisted light in vacuum: comment
... has to consider the group velocity not at points on the axis z but outside of it—on the ring. Exactly that was done by the authors of Ref. [1] and results of their calculations in Fig. 1(b) show the subluminality effect. We do not question the effect and its linear dependence on the index l. Indeed, ...
... has to consider the group velocity not at points on the axis z but outside of it—on the ring. Exactly that was done by the authors of Ref. [1] and results of their calculations in Fig. 1(b) show the subluminality effect. We do not question the effect and its linear dependence on the index l. Indeed, ...
Light trapping in thin film organic solar cells
... Light trapping can be achieved upon novel designs of the device geometry [29–33]. A folded or V-shaped geometry is interesting, as its formation requires one single additional step, which is to fold the cell [29]. This can be easily done when a plastic substrate is used. A schematic device architect ...
... Light trapping can be achieved upon novel designs of the device geometry [29–33]. A folded or V-shaped geometry is interesting, as its formation requires one single additional step, which is to fold the cell [29]. This can be easily done when a plastic substrate is used. A schematic device architect ...
Session 10 Wave Optics
... coherent light waves. This is Huygens’ Principle. When observed on a distant screen, alternate bright and dark patterns (fringes) can be seen. This is a result of interference of the ‘secondary’ waves. One can understand the interference by considering the path difference between pairs of waves at t ...
... coherent light waves. This is Huygens’ Principle. When observed on a distant screen, alternate bright and dark patterns (fringes) can be seen. This is a result of interference of the ‘secondary’ waves. One can understand the interference by considering the path difference between pairs of waves at t ...
Fluidic Optics - Whitesides Group
... Fabrication in PDMS is easy, and its use as a material reduces the time, complexity, and cost of prototyping; its influence on costs of manufactured systems remains to be established, but polymers are, in general, less expensive than ceramics as materials. PDMS has a refractive index of ~ 1.4. It is ...
... Fabrication in PDMS is easy, and its use as a material reduces the time, complexity, and cost of prototyping; its influence on costs of manufactured systems remains to be established, but polymers are, in general, less expensive than ceramics as materials. PDMS has a refractive index of ~ 1.4. It is ...
Anti-reflective coating
An antireflective or anti-reflection (AR) coating is a type of optical coating applied to the surface of lenses and other optical elements to reduce reflection. In typical imaging systems, this improves the efficiency since less light is lost. In complex systems such as a telescope, the reduction in reflections also improves the contrast of the image by elimination of stray light. This is especially important in planetary astronomy. In other applications, the primary benefit is the elimination of the reflection itself, such as a coating on eyeglass lenses that makes the eyes of the wearer more visible to others, or a coating to reduce the glint from a covert viewer's binoculars or telescopic sight.Many coatings consist of transparent thin film structures with alternating layers of contrasting refractive index. Layer thicknesses are chosen to produce destructive interference in the beams reflected from the interfaces, and constructive interference in the corresponding transmitted beams. This makes the structure's performance change with wavelength and incident angle, so that color effects often appear at oblique angles. A wavelength range must be specified when designing or ordering such coatings, but good performance can often be achieved for a relatively wide range of frequencies: usually a choice of IR, visible, or UV is offered.