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
... natural materials to fulfil such demands. For example, natural materials only show magnetism (m/m0 s 1) up to terahertz frequencies. Fortunately, the emerging field of metamaterials offers an entirely new route to design material properties at will, so that the transformation optical design could be ...
... natural materials to fulfil such demands. For example, natural materials only show magnetism (m/m0 s 1) up to terahertz frequencies. Fortunately, the emerging field of metamaterials offers an entirely new route to design material properties at will, so that the transformation optical design could be ...
DU4301727731
... molecules increases when concentration increases, more particles are thermally agitated resulting in an enhanced effect. The optical nonlinearity of the dye may be due to laser heating induced nonlinear effect. A laser beam, while passing through an absorbing media, induces temperature and density g ...
... molecules increases when concentration increases, more particles are thermally agitated resulting in an enhanced effect. The optical nonlinearity of the dye may be due to laser heating induced nonlinear effect. A laser beam, while passing through an absorbing media, induces temperature and density g ...
Atomic Layer Deposition for Photonic Crystal Devices
... • Large refraction characteristics with small change in incident beam angle • Effect does not require a band gap • Effect can be ‘tunable’ by using electro-optic materals ...
... • Large refraction characteristics with small change in incident beam angle • Effect does not require a band gap • Effect can be ‘tunable’ by using electro-optic materals ...
mirrors, combination of mirrors and catadioptric systems
... either made « hollow », using actual mirrors, or in the shape of glass prisms such as those we already described in chapter III (§II). We had shown in that chapter the possibility for these prisms to be achromatic like mirrors, in spite of refraction. The choice between these two designs is made as ...
... either made « hollow », using actual mirrors, or in the shape of glass prisms such as those we already described in chapter III (§II). We had shown in that chapter the possibility for these prisms to be achromatic like mirrors, in spite of refraction. The choice between these two designs is made as ...
Radiative Transfer Theory - UCL Department of Geography
... Note that the single scattering albedo for leaves is not always low. This is particularly true in the near infrared. In this case, we still need to account for further orders of scattering. The iterative method used above for the microwave case is not directly appropriate, but a range of methods exi ...
... Note that the single scattering albedo for leaves is not always low. This is particularly true in the near infrared. In this case, we still need to account for further orders of scattering. The iterative method used above for the microwave case is not directly appropriate, but a range of methods exi ...
Influence of substrate configuration on the angular response pattern
... degrees of freedom. The angular response pattern can be measured by placing the device at the axis of rotation of the goniometer and co-aligning to the laser beam. The output beam of the CO2 laser is attenuated to a low power using neutral density filters, chopped with a mechanical chopper, and focu ...
... degrees of freedom. The angular response pattern can be measured by placing the device at the axis of rotation of the goniometer and co-aligning to the laser beam. The output beam of the CO2 laser is attenuated to a low power using neutral density filters, chopped with a mechanical chopper, and focu ...
Laser oscillation in proton implanted Nd:YAG waveguides
... Introduction Nd doped YAG is one of the most attractive dielectric materials for solid state lasers. The efficiency of laser operation is enhanced by using waveguide geometries, because the optical modes propagate well confined in the waveguide structure, avoiding thus diffraction effects. Several t ...
... Introduction Nd doped YAG is one of the most attractive dielectric materials for solid state lasers. The efficiency of laser operation is enhanced by using waveguide geometries, because the optical modes propagate well confined in the waveguide structure, avoiding thus diffraction effects. Several t ...
Pulse Delay Chromatic Dispersion Measurements in Single Mode
... of high power laser beams and fibre optic sensors also rely on optical fibre. However nonlinear effects, attenuation of the optical signal, polarization mode dispersion and chromatic dispersion can interfere with the high-speed data transmission. These effects are but a few detrimental factors that ...
... of high power laser beams and fibre optic sensors also rely on optical fibre. However nonlinear effects, attenuation of the optical signal, polarization mode dispersion and chromatic dispersion can interfere with the high-speed data transmission. These effects are but a few detrimental factors that ...
Single Particle Spectroscopy Study of Metal-Film
... one predominant peak with a weaker shoulder. Note that in Figure 1b all the spectra have been normalized in order to facilitate direct comparison of peak positions. However, it should be noted that the particle on the Au-coated samples shows stronger scattering intensities compared to those observed ...
... one predominant peak with a weaker shoulder. Note that in Figure 1b all the spectra have been normalized in order to facilitate direct comparison of peak positions. However, it should be noted that the particle on the Au-coated samples shows stronger scattering intensities compared to those observed ...
YZM NI
... 0.25 s/ml. The coated POF is dried and kept in an oven at 50 C for 4 h to crosslink the thin film on the polished segment of the POF. The PMMA plastic optical fibre containing the optical sensing segment is located in a temperature controlled humidity box, as shown in Fig. 4. For the purpose of cont ...
... 0.25 s/ml. The coated POF is dried and kept in an oven at 50 C for 4 h to crosslink the thin film on the polished segment of the POF. The PMMA plastic optical fibre containing the optical sensing segment is located in a temperature controlled humidity box, as shown in Fig. 4. For the purpose of cont ...
PDF - Photonics Research Group
... However, these will not only increase processing complexities but also increase electrical and thermal series resistances. Hence, an ohmic contact with minimized optical loss is of great importance for membrane devices. The ohmic contact on top of a membrane device is typically n-type. This is becau ...
... However, these will not only increase processing complexities but also increase electrical and thermal series resistances. Hence, an ohmic contact with minimized optical loss is of great importance for membrane devices. The ohmic contact on top of a membrane device is typically n-type. This is becau ...
Single Particle Spectroscopy Study of Metal-Film
... one predominant peak with a weaker shoulder. Note that in Figure 1b all the spectra have been normalized in order to facilitate direct comparison of peak positions. However, it should be noted that the particle on the Au-coated samples shows stronger scattering intensities compared to those observed ...
... one predominant peak with a weaker shoulder. Note that in Figure 1b all the spectra have been normalized in order to facilitate direct comparison of peak positions. However, it should be noted that the particle on the Au-coated samples shows stronger scattering intensities compared to those observed ...
Superresolution size determination in fluorescence microscopy: A
... tion in the image data file. Distances between such objects down to about 15 nm have been measured with a precision 共95% confidence limit兲 as good as 10 nm using optically ‘‘conventional’’ fluorescence microscopes.19,24 In this article, results from a different far field light microscopical approach ...
... tion in the image data file. Distances between such objects down to about 15 nm have been measured with a precision 共95% confidence limit兲 as good as 10 nm using optically ‘‘conventional’’ fluorescence microscopes.19,24 In this article, results from a different far field light microscopical approach ...
Self-rotation of resonant elliptically polarized light in collision
... electro-optics, which can be thought of as three stage processes (see, e.g., Ref. [4] and references therein) consisting of optical pumping (which produces atomic polarization), quantum beats (which modify atomic polarization), and modification of the polarization of weak probe light as it propagate ...
... electro-optics, which can be thought of as three stage processes (see, e.g., Ref. [4] and references therein) consisting of optical pumping (which produces atomic polarization), quantum beats (which modify atomic polarization), and modification of the polarization of weak probe light as it propagate ...
optical design of an echelle grating based atomic emission
... θB = 74°, and choosing minimum possible φ = 14° from physical considerations, we get the parameters : mmin = 60, mmax = 120, Ψmax = 243539 Å, Ψmin = 239547 Å and ∆β = 4.45°. For a detector size of 13.3 mm X 13.3 mm the focal length f2 of M2 is calculated to be 175 mm from the relation: ...
... θB = 74°, and choosing minimum possible φ = 14° from physical considerations, we get the parameters : mmin = 60, mmax = 120, Ψmax = 243539 Å, Ψmin = 239547 Å and ∆β = 4.45°. For a detector size of 13.3 mm X 13.3 mm the focal length f2 of M2 is calculated to be 175 mm from the relation: ...
V. experimental setup of all-optical tunable delay
... Abstract— In this system, we report experimental demonstration of an all-optical tunable delay element based on the combination of wavelength conversion and fiber dispersion with a total delay range of 3870ps. We present wavelength conversion method that show with FWM of phase conjugation property. ...
... Abstract— In this system, we report experimental demonstration of an all-optical tunable delay element based on the combination of wavelength conversion and fiber dispersion with a total delay range of 3870ps. We present wavelength conversion method that show with FWM of phase conjugation property. ...
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.