Aberration-Free Ultrathin Flat Lenses and Axicons at Telecom
... to the design and demonstration of aberration-free planar lenses and axicons, comprising a phased array of ultrathin subwavelength-spaced optical antennas. The lenses and axicons consist of V-shaped nanoantennas that introduce a radial distribution of phase discontinuities, thereby generating respec ...
... to the design and demonstration of aberration-free planar lenses and axicons, comprising a phased array of ultrathin subwavelength-spaced optical antennas. The lenses and axicons consist of V-shaped nanoantennas that introduce a radial distribution of phase discontinuities, thereby generating respec ...
At-wavelength figure metrology of hard x
... hard x rays, but also the focusing intensity distribution properties determine the spatial and contrast resolution performances of the microscope used. An ideally focused beam, which is the so-called diffraction-limited focused beam, provides such microscopes with excellent resolution performances. ...
... hard x rays, but also the focusing intensity distribution properties determine the spatial and contrast resolution performances of the microscope used. An ideally focused beam, which is the so-called diffraction-limited focused beam, provides such microscopes with excellent resolution performances. ...
Topic 4.5 - Aurora City School
... • The new wavefront would then be the surface that is tangent to all the forward wavelets from each point on the old wavefront. • We can easily see that a plane wavefront moving undisturbed forward easily obeys this construction. ...
... • The new wavefront would then be the surface that is tangent to all the forward wavelets from each point on the old wavefront. • We can easily see that a plane wavefront moving undisturbed forward easily obeys this construction. ...
Reports for the two projects on Bisosensors have been combined
... Recent studies in photonic crystals or gratings have shown some beaming effects [1],[2], but these designs need a cavity under the periodic structure. Recently, periodic groves in a silver film produced enhanced radiation at optical frequencies which includes a directive beam [3]-[6]. The beaming ef ...
... Recent studies in photonic crystals or gratings have shown some beaming effects [1],[2], but these designs need a cavity under the periodic structure. Recently, periodic groves in a silver film produced enhanced radiation at optical frequencies which includes a directive beam [3]-[6]. The beaming ef ...
Lab Writeup Michelson(New)
... monochromatic light produces an interference pattern which consists of a set of concentric circles centered on the field of view. The larger d, the larger the number of circles. Decreasing the magnitude of d makes the circles shrink toward the center, increasing the magnitude of d makes the circles ...
... monochromatic light produces an interference pattern which consists of a set of concentric circles centered on the field of view. The larger d, the larger the number of circles. Decreasing the magnitude of d makes the circles shrink toward the center, increasing the magnitude of d makes the circles ...
PowerPoint 簡報
... • The theory of quantum optics provides an explanation of virtually all optical phenomena. The theory of electromagnetic optics provides the most complete treatment of light within the confines of classical optics (electromagnetic optics, wave optics, ray optics) • Wave optics is a scalar approximat ...
... • The theory of quantum optics provides an explanation of virtually all optical phenomena. The theory of electromagnetic optics provides the most complete treatment of light within the confines of classical optics (electromagnetic optics, wave optics, ray optics) • Wave optics is a scalar approximat ...
The coherence length of black
... One should bear in mind that what is observed also depends on the spectral response of the detector used. A case of practical importance is when the observation is visual. If we take the FWHM of the spectral response of the human eye as 100 THz, the coherence length lc can be calculated using equati ...
... One should bear in mind that what is observed also depends on the spectral response of the detector used. A case of practical importance is when the observation is visual. If we take the FWHM of the spectral response of the human eye as 100 THz, the coherence length lc can be calculated using equati ...
Document
... the rays strike close to th e centre of the mirror. • In real systems the rays hit the whole mirror. We find that rays that hit near the outside of mirror are focused at a different point when compared with those that are close to the centre. • This causes a blurring of the image, and is known as sp ...
... the rays strike close to th e centre of the mirror. • In real systems the rays hit the whole mirror. We find that rays that hit near the outside of mirror are focused at a different point when compared with those that are close to the centre. • This causes a blurring of the image, and is known as sp ...
Analysing the potential for application of the phase shift method in
... Despite rapid technological development in measuring methods used in industrial endoscopy, precise measurement of the dimensions of the detected surface defects is still a challenging problem. New opportunities in this area have been brought by various 3D scanning techniques which consist in convert ...
... Despite rapid technological development in measuring methods used in industrial endoscopy, precise measurement of the dimensions of the detected surface defects is still a challenging problem. New opportunities in this area have been brought by various 3D scanning techniques which consist in convert ...
Dynamic measurements using a Fizeau
... Dynamic metrology based on instantaneous single-frame exposure time requires a higher energy light source to reach comparable camera signal-to-noise levels as phase-scanning techniques, where interferograms are sampled over longer exposure times and multiple frames. The higher optical power require ...
... Dynamic metrology based on instantaneous single-frame exposure time requires a higher energy light source to reach comparable camera signal-to-noise levels as phase-scanning techniques, where interferograms are sampled over longer exposure times and multiple frames. The higher optical power require ...
Optical Micrometer
... which is called the critical angle. If the angle of incidence is larger than the critical angle, there cannot be a refracted ray and the beam is totally internally reflected. A light ray traversing a plate of material with parallel entrance and exit faces is displaced laterally without a change in d ...
... which is called the critical angle. If the angle of incidence is larger than the critical angle, there cannot be a refracted ray and the beam is totally internally reflected. A light ray traversing a plate of material with parallel entrance and exit faces is displaced laterally without a change in d ...
JAP04 - Anglictina pro fyziky 4 Refractive index
... How can we measure the refractive index of air? A value of the refractive index is now being achieved generally by two methods: the first of them (indirect) is based on modified Edlen’s formula where atmospheric conditions as local pressure, temperature, humidity, and CO2 concentration are measured ...
... How can we measure the refractive index of air? A value of the refractive index is now being achieved generally by two methods: the first of them (indirect) is based on modified Edlen’s formula where atmospheric conditions as local pressure, temperature, humidity, and CO2 concentration are measured ...
Airway Luminal Diameter and Shape Measurement by Means of an
... Figure Legend: Tracheal measurement model identical to that illustrated in Figure 3 except using greater distance (y2). A, White light passed from a tungsten-halogen source is collimated and directed at a diffraction grating to form a spectrum on the luminal surface of the divided trachea. The optic ...
... Figure Legend: Tracheal measurement model identical to that illustrated in Figure 3 except using greater distance (y2). A, White light passed from a tungsten-halogen source is collimated and directed at a diffraction grating to form a spectrum on the luminal surface of the divided trachea. The optic ...
Generalized Laws of Reflection and Refraction
... antenna resonance occurs at h ≈ leff/2, where leff is the effective wavelength (14). In the antisymmetric mode, the current distribution in each arm approximates that of one half of a straight antenna of length 2h (Fig. 2B, right), and the condition for the first-order resonance of this mode is 2h ≈ ...
... antenna resonance occurs at h ≈ leff/2, where leff is the effective wavelength (14). In the antisymmetric mode, the current distribution in each arm approximates that of one half of a straight antenna of length 2h (Fig. 2B, right), and the condition for the first-order resonance of this mode is 2h ≈ ...
ULTRAFAST MEASUREMENT OF THE OPTICAL
... The experimental arrangement for USI is shown schematically in Fig. 1. The thin film targets were mounted on a computer-controlled x-y translation stage. The target was rastered about 4 laser diameters between experiments so that each laserdriven shock would propagate into undisturbed material. Expe ...
... The experimental arrangement for USI is shown schematically in Fig. 1. The thin film targets were mounted on a computer-controlled x-y translation stage. The target was rastered about 4 laser diameters between experiments so that each laserdriven shock would propagate into undisturbed material. Expe ...
PDF
... laser beams pass through the objective lens and return toward the optical pickup side, when the phase of the diffracted beam is equal to that of the reflected beam, the optical intensity is increased in the area at which the diffracted beam arrives; on the contrary, if the diffracted and reflected b ...
... laser beams pass through the objective lens and return toward the optical pickup side, when the phase of the diffracted beam is equal to that of the reflected beam, the optical intensity is increased in the area at which the diffracted beam arrives; on the contrary, if the diffracted and reflected b ...
Chapter 8 Wave Optics
... This phenomenon is quite important. The resolution of many instrument like telescope and microscope depends on this. 8.2.3 The diffraction grating (衍射光栅) Suppose that, instead of a single slit, or two slits side by side in Yong’s experiments, we have a very large number of parallel slits, all of the ...
... This phenomenon is quite important. The resolution of many instrument like telescope and microscope depends on this. 8.2.3 The diffraction grating (衍射光栅) Suppose that, instead of a single slit, or two slits side by side in Yong’s experiments, we have a very large number of parallel slits, all of the ...
The Analysis of Liquid Crystal Phases using Polarized Optical
... Birefringent or doubly-refracting sample has a unique property that it can produce two individual wave components while one wave passes through it, those two components are termed as ordinary and extraordinary waves. Figure 7 is an illustration of a typical construction of Nicol polarizing prism, as ...
... Birefringent or doubly-refracting sample has a unique property that it can produce two individual wave components while one wave passes through it, those two components are termed as ordinary and extraordinary waves. Figure 7 is an illustration of a typical construction of Nicol polarizing prism, as ...
Coherence properties of light propagated through a
... information content than fully coherent wavefields and that the use of partially coherent illumination in imaging can yield higher spatial resolution.2 Hence, the characterisation of the coherence properties of a wavefield embodied in the MOI is of critical importance for applications including imag ...
... information content than fully coherent wavefields and that the use of partially coherent illumination in imaging can yield higher spatial resolution.2 Hence, the characterisation of the coherence properties of a wavefield embodied in the MOI is of critical importance for applications including imag ...
Optic Version of the Mach-Zehnder Interferometer
... Optoelectronics Laboratory, Department of Physics, University of San Carlos, Cebu City 6000, Philippines ...
... Optoelectronics Laboratory, Department of Physics, University of San Carlos, Cebu City 6000, Philippines ...
ABOUT THE EXTRAORDINARY REFRACTIVE INDEX
... When a beam of light passes through the ADP crystal, results two beams with different properties. One of them is called the ordinary beam which is characterized by an ordinary refractive index, and the other is called extraordinary and is characterized by an extraordinary refractive index. For each ...
... When a beam of light passes through the ADP crystal, results two beams with different properties. One of them is called the ordinary beam which is characterized by an ordinary refractive index, and the other is called extraordinary and is characterized by an extraordinary refractive index. For each ...
Interference of Light waves Wave Optics
... • In constructive interference the amplitude of the resultant wave is greater than that of either individual wave • In destructive interference the amplitude of the resultant wave is less than that of either individual wave • All interference associated with light waves arises when the electromagnet ...
... • In constructive interference the amplitude of the resultant wave is greater than that of either individual wave • In destructive interference the amplitude of the resultant wave is less than that of either individual wave • All interference associated with light waves arises when the electromagnet ...
Evaluation and application of spatial light modulators for
... derivation of information about the structure of objects and their behavior under typical operational or environmental conditions. Recent implementations in optical range and displacement sensors are the basis for numerous applications in civil engineering, industrial inspection, traffic control, re ...
... derivation of information about the structure of objects and their behavior under typical operational or environmental conditions. Recent implementations in optical range and displacement sensors are the basis for numerous applications in civil engineering, industrial inspection, traffic control, re ...
Phase-contrast X-ray imaging
Phase-contrast X-ray imaging (PCI) or phase-sensitive X-ray imaging is a general term for different technical methods that use information concerning changes in the phase of an X-ray beam that passes through an object in order to create its images. Standard X-ray imaging techniques like radiography or computed tomography (CT) rely on a decrease of the X-ray beam's intensity (attenuation) when traversing the sample, which can be measured directly with the assistance of an X-ray detector. In PCI however, the beam's phase shift caused by the sample is not measured directly, but is transformed into variations in intensity, which then can be recorded by the detector.In addition to producing projection images, PCI, like conventional transmission, can be combined with tomographic techniques to obtain the 3D distribution of the real part of the refractive index of the sample. When applied to samples that consist of atoms with low atomic number Z, PCI is more sensitive to density variations in the sample than conventional transmission-based X-ray imaging. This leads to images with improved soft tissue contrast.In the last several years, a variety of phase-contrast X-ray imaging techniques have been developed, all of which are based on the observation of interference patterns between diffracted and undiffracted waves. The most common techniques are crystal interferometry, propagation-based imaging, analyzer-based imaging, edge-illumination and grating-based imaging (see below).