An optical cloak made of dielectrics LETTERS *
... used so that all of the originally square cells are transformed to rectangles of a constant aspect ratio. Whereas all other mappings result in a highly anisotropic cloak profile, the quasi-conformal mapping can make the transformed cells almost square, so that the anisotropy of the medium is minimiz ...
... used so that all of the originally square cells are transformed to rectangles of a constant aspect ratio. Whereas all other mappings result in a highly anisotropic cloak profile, the quasi-conformal mapping can make the transformed cells almost square, so that the anisotropy of the medium is minimiz ...
Generalized Jinc functions and their application to focusing and
... space and the corresponding moments in the spatialfrequency domain. In principle, their expression [see Eq. (7) of Ref. 10] can be used to analytically describe an arbitrary paraxial focusing system, provided that the farfield distribution at the focal plane is known and has all the high-order parti ...
... space and the corresponding moments in the spatialfrequency domain. In principle, their expression [see Eq. (7) of Ref. 10] can be used to analytically describe an arbitrary paraxial focusing system, provided that the farfield distribution at the focal plane is known and has all the high-order parti ...
Ch 4 Electrical and optical properties
... The highest a.c. electrical frequencies we have discussed fall within the short radiowave and microwave regions of the electromagnetic spectrum. The transmission and absorption of radiation by the polymer dielectric are determined by the quantities e, and e". Even higher frequencies bring us into th ...
... The highest a.c. electrical frequencies we have discussed fall within the short radiowave and microwave regions of the electromagnetic spectrum. The transmission and absorption of radiation by the polymer dielectric are determined by the quantities e, and e". Even higher frequencies bring us into th ...
Fourier, Fresnel and Image CGHs of three
... Synthesizing a computer-generated hologram (CGH) of a three-dimensional (3-D) image can be a heavy computational task1. One needs to superpose the mathematical contributions of many waves originating from many points on the objects, when not all of them are located at the same distance from the holo ...
... Synthesizing a computer-generated hologram (CGH) of a three-dimensional (3-D) image can be a heavy computational task1. One needs to superpose the mathematical contributions of many waves originating from many points on the objects, when not all of them are located at the same distance from the holo ...
Negative Refraction and Left-handed electromagnetism in
... A material possessing simultaneously negative permittivity ε < 0 and permeability µ < 0 can be shown to necessarily have n ≡ εµ = − | ε || µ | < 0 ...
... A material possessing simultaneously negative permittivity ε < 0 and permeability µ < 0 can be shown to necessarily have n ≡ εµ = − | ε || µ | < 0 ...
Recent advances in transformation optics
... In fact, it has been long known that a spatially changing refractive index modifies light propagation characteristics. Based on the early work of the ancient Greek mathematician Hero of Alexandria (10–70 AD) and the Arab scientist Ibn al-Haytham (965–1040 AD), Pierre de Fermat formulated the famous ...
... In fact, it has been long known that a spatially changing refractive index modifies light propagation characteristics. Based on the early work of the ancient Greek mathematician Hero of Alexandria (10–70 AD) and the Arab scientist Ibn al-Haytham (965–1040 AD), Pierre de Fermat formulated the famous ...
Recent advances in transformation optics
... In fact, it has been long known that a spatially changing refractive index modifies light propagation characteristics. Based on the early work of the ancient Greek mathematician Hero of Alexandria (10–70 AD) and the Arab scientist Ibn al-Haytham (965–1040 AD), Pierre de Fermat formulated the famous ...
... In fact, it has been long known that a spatially changing refractive index modifies light propagation characteristics. Based on the early work of the ancient Greek mathematician Hero of Alexandria (10–70 AD) and the Arab scientist Ibn al-Haytham (965–1040 AD), Pierre de Fermat formulated the famous ...
Novel technique for thermal lens measurement in commonly used
... The beam transmitted by the test substrate is coupled into a scanned optical cavity using two piezo actuated mirrors for auto-alignment and two spherical lenses for mode matching. For the alignment control loop, two quadrant photo diodes detected the beam reflected by the cavity at different Gouy ph ...
... The beam transmitted by the test substrate is coupled into a scanned optical cavity using two piezo actuated mirrors for auto-alignment and two spherical lenses for mode matching. For the alignment control loop, two quadrant photo diodes detected the beam reflected by the cavity at different Gouy ph ...
Introduction of Minor Nonlinear Effect Strain Insensitive SMF Fitting
... cladding in the step index profile [7]. This way results in MFD reduction. Furthermore, higher order modes would be appeared in it. Other bend minimizing techniques include depressed cladding, adding a low index trench, and photonic crystal fiber employment [8-10]. Photonic crystal fibers (PCFs) hav ...
... cladding in the step index profile [7]. This way results in MFD reduction. Furthermore, higher order modes would be appeared in it. Other bend minimizing techniques include depressed cladding, adding a low index trench, and photonic crystal fiber employment [8-10]. Photonic crystal fibers (PCFs) hav ...
Session 10 Wave Optics
... Thomas Young was a champion of the wave theory of light on the basis that it could account for interference phenomena. It should be easy to understand how waves on the surface of a pond add when they are in phase and cancel when they are 1800 out of phase. ...
... Thomas Young was a champion of the wave theory of light on the basis that it could account for interference phenomena. It should be easy to understand how waves on the surface of a pond add when they are in phase and cancel when they are 1800 out of phase. ...
The Wigner function in paraxial optics I. Matrix
... (called the momentum), which gives information about the direction of propagation of the different (plane wave) components of the field. For laser signal processors, the range of directions is usually very narrow, so it is valid to describe these systems by using the paraxial approximation. Paraxial ...
... (called the momentum), which gives information about the direction of propagation of the different (plane wave) components of the field. For laser signal processors, the range of directions is usually very narrow, so it is valid to describe these systems by using the paraxial approximation. Paraxial ...
5377 17paper
... Rather than spatially, it is convenient to examine this object structure in the frequency domain. The idea is to find the optimum linear combination of features that samples the entire pupil. As an example, Figure 2(a) shows the magnitude of the diffraction energy within the objective lens pupil for ...
... Rather than spatially, it is convenient to examine this object structure in the frequency domain. The idea is to find the optimum linear combination of features that samples the entire pupil. As an example, Figure 2(a) shows the magnitude of the diffraction energy within the objective lens pupil for ...
An analogy strategy for transformation optics Yao Chen Liu
... components such as lenses [12–18], waveguides [19–21], light-harvesting devices [22] and polarization converters [23]. Most of these blueprints, however, confront difficulties in realization because of the required complex and extreme material properties after transformation. The state-of-the-art met ...
... components such as lenses [12–18], waveguides [19–21], light-harvesting devices [22] and polarization converters [23]. Most of these blueprints, however, confront difficulties in realization because of the required complex and extreme material properties after transformation. The state-of-the-art met ...
Mikla JOAM 2012
... the occurrence of the technological revolution involving not only computer applications but also the disappearance of the small independent X-ray companies into today's multinational companies. Research and development is nowadays just too expensive for much independent practical high-technology con ...
... the occurrence of the technological revolution involving not only computer applications but also the disappearance of the small independent X-ray companies into today's multinational companies. Research and development is nowadays just too expensive for much independent practical high-technology con ...
Get PDF - OSA Publishing
... In the experimental set-up, this is performed with a phase-only spatial light modulator (SLM). We first derive the theoretical concept that relates the refractive index and the physical thickness of an aberration-inducing medium to the focus shift. Then the PSF measurement system based on the use of ...
... In the experimental set-up, this is performed with a phase-only spatial light modulator (SLM). We first derive the theoretical concept that relates the refractive index and the physical thickness of an aberration-inducing medium to the focus shift. Then the PSF measurement system based on the use of ...
Resolution scaling in STED microscopy
... dark and bright states, to achieve such resolutions have since been demonstrated [8-13]. At the same time, STED has been applied to a multitude of imaging tasks [14-17] mainly in biology and more recently, STED microscopes have become commercially available. The resolution achieved by such a far-fie ...
... dark and bright states, to achieve such resolutions have since been demonstrated [8-13]. At the same time, STED has been applied to a multitude of imaging tasks [14-17] mainly in biology and more recently, STED microscopes have become commercially available. The resolution achieved by such a far-fie ...
Fluorescence Microscopy
... phenomena, and where better its application than when trying to comprehend cell physiology using florescence microscopy? Microscopy has played an important role in determining the activity of cells, from the very early appreciation of living animalcules by Van Leeuwenhoek (Ford 1989) with a simple mi ...
... phenomena, and where better its application than when trying to comprehend cell physiology using florescence microscopy? Microscopy has played an important role in determining the activity of cells, from the very early appreciation of living animalcules by Van Leeuwenhoek (Ford 1989) with a simple mi ...
Light-Scattering Study of the Normal Human Eye
... resulting time-dependent changes in the electromagnetic characteristics, such as the refractive index of the material, underlie the coupling of the light to the acoustic modes. Conversely, the electric field of an incident light wave can induce spatially varying and temporally periodic elastic strai ...
... resulting time-dependent changes in the electromagnetic characteristics, such as the refractive index of the material, underlie the coupling of the light to the acoustic modes. Conversely, the electric field of an incident light wave can induce spatially varying and temporally periodic elastic strai ...
Ch 03 - Aberrations
... In Chap. 2 we discussed the image-forming characteristics of optical systems, but we limited our consideration to an infinitesimal threadlike region about the optical axis called the paraxial region. In this chapter we will consider, in general terms, the behavior of lenses with finite apertures and ...
... In Chap. 2 we discussed the image-forming characteristics of optical systems, but we limited our consideration to an infinitesimal threadlike region about the optical axis called the paraxial region. In this chapter we will consider, in general terms, the behavior of lenses with finite apertures and ...
Introduction to super-resolution microscopy
... has to be modified to obtain the information of axial displacement of fluorescent probes. 3D-STORM inserts a cylindrical lens between the objective and tube lens to introduce astigmatism in the imaging system. The z position of the probe can then be measured as elliptical deformation of the fluorescenc ...
... has to be modified to obtain the information of axial displacement of fluorescent probes. 3D-STORM inserts a cylindrical lens between the objective and tube lens to introduce astigmatism in the imaging system. The z position of the probe can then be measured as elliptical deformation of the fluorescenc ...
Electron diffraction for analysing crystal orientation of thin films
... diffraction it seems important to emphasize that within this chapter the term ’diffraction’ is treated synonymously with ’elastic scattering’, i.e. a process which preserves the energy of the incident electron. If the accelerating voltage of the electron is in the range of 20 - 200 V (sometimes up t ...
... diffraction it seems important to emphasize that within this chapter the term ’diffraction’ is treated synonymously with ’elastic scattering’, i.e. a process which preserves the energy of the incident electron. If the accelerating voltage of the electron is in the range of 20 - 200 V (sometimes up t ...
IOSR Journal of Applied Physics (IOSR-JAP)
... depends on the total number of analytes in the volume. As a result, the detection signal does not scale down with the sample volume. This characteristic makes label-free detection advantageous over label-based detection and particularly attractive when ultra small (femtoliter to nanoliter) detection ...
... depends on the total number of analytes in the volume. As a result, the detection signal does not scale down with the sample volume. This characteristic makes label-free detection advantageous over label-based detection and particularly attractive when ultra small (femtoliter to nanoliter) detection ...
amplitude transfer function
... our analysis has been “diffraction–limited” • Aberration effects on the MTF are FoV (field) location–dependent: typically we get more blur near the edges of the field (narrower MTF ⇔broader PSF) • This, in addition, means that real–life optical systems are not shift invariant either! • ⇒ the concept ...
... our analysis has been “diffraction–limited” • Aberration effects on the MTF are FoV (field) location–dependent: typically we get more blur near the edges of the field (narrower MTF ⇔broader PSF) • This, in addition, means that real–life optical systems are not shift invariant either! • ⇒ the concept ...
PDF
... of Lg 苷 Lu 兾2. The two surface gratings are shifted by Lu 兾2 with respect to each other and separated by a distance of ⬃d along the Z axis. The resulting diffraction pattern is a superposition of diffraction effects caused by the three stacked gratings and can be described with Eqs. (1) and (2). The ...
... of Lg 苷 Lu 兾2. The two surface gratings are shifted by Lu 兾2 with respect to each other and separated by a distance of ⬃d along the Z axis. The resulting diffraction pattern is a superposition of diffraction effects caused by the three stacked gratings and can be described with Eqs. (1) and (2). The ...
Superlens
A practical superlens, or super lens, is a lens which uses metamaterials to go beyond the diffraction limit. The diffraction limit is a feature of conventional lenses and microscopes that limits the fineness of their resolution. Many lens designs have been proposed that go beyond the diffraction limit in some way, but there are constraints and obstacles involved in realizing each of them.