All-dielectric subwavelength metasurface focusing lens
... geometric parameters of the fine pattern. The meta-surface thickness is approximately onethird of the free-space wavelength (λ0 = 1.55 μm, and height ≈0.5 μm), in our specific case. Hence, the phase mask depth variation, Δφ ≈2πδn(h/λ0) ~2⋅δn rad < 2π, across the lens area is relatively small. Theref ...
... geometric parameters of the fine pattern. The meta-surface thickness is approximately onethird of the free-space wavelength (λ0 = 1.55 μm, and height ≈0.5 μm), in our specific case. Hence, the phase mask depth variation, Δφ ≈2πδn(h/λ0) ~2⋅δn rad < 2π, across the lens area is relatively small. Theref ...
Nondiffracting Light Beams for Long Ranges
... (argon-laser) transmission by a Galilean telescope of 10 cm diameter. By this reason, we will introduce at first generation of a LRNB of 10 cm diameter. The focal length f of the telescope’s objective is 40 cm, thus F (=f/D) is 4 and that of eyepiece is set to be 5 cm. Figure 4 shows a wave front wh ...
... (argon-laser) transmission by a Galilean telescope of 10 cm diameter. By this reason, we will introduce at first generation of a LRNB of 10 cm diameter. The focal length f of the telescope’s objective is 40 cm, thus F (=f/D) is 4 and that of eyepiece is set to be 5 cm. Figure 4 shows a wave front wh ...
Multiplexing in high-density optical data storage using the orbital
... If l is an integer, the orbital angular momentum has been increased by an amount of l h . Of course, l does not have to be limited to integer values; in that case, the expectation value for the angular momentum simply takes on the analog value of l h . For the total beam, the angular momentum per un ...
... If l is an integer, the orbital angular momentum has been increased by an amount of l h . Of course, l does not have to be limited to integer values; in that case, the expectation value for the angular momentum simply takes on the analog value of l h . For the total beam, the angular momentum per un ...
Wavelength verification of laser through varied slit widths using a
... Program, the order for the destructive interference was known. The manipulated variable in this research was the usage of different slit widths (0.04 mm, 0.08 mm, and 0.16 mm). It was seen from the experiment that the wavelength is approximately close to the actual one. Even though different slit wi ...
... Program, the order for the destructive interference was known. The manipulated variable in this research was the usage of different slit widths (0.04 mm, 0.08 mm, and 0.16 mm). It was seen from the experiment that the wavelength is approximately close to the actual one. Even though different slit wi ...
optics - einstein classes
... If a person of height h wants to see his full image in a plane mirror, the minimum height of the mirror should be h/2, whatever be the distance of the person from the mirror. The mirror should be placed such that its upper edge is midway between the head and the eye of the person and the lower edge ...
... If a person of height h wants to see his full image in a plane mirror, the minimum height of the mirror should be h/2, whatever be the distance of the person from the mirror. The mirror should be placed such that its upper edge is midway between the head and the eye of the person and the lower edge ...
Improved Intrapulse Raman Scattering Control via Asymmetric Airy
... compared with the case of a prechirped Gaussian-like pulse, showing significant advantages. Finally, we also discuss how Airy pulses may enable the generation and control of multicolor Raman solitons. In Fig. 1(a), we present a typical Airy pulse with an oscillating tail in its fast edge. The associ ...
... compared with the case of a prechirped Gaussian-like pulse, showing significant advantages. Finally, we also discuss how Airy pulses may enable the generation and control of multicolor Raman solitons. In Fig. 1(a), we present a typical Airy pulse with an oscillating tail in its fast edge. The associ ...
B. Gaussian Beam Transformation by a Lens.
... (b) focusing a collimated light beam to a point. These lenses are usually achromatic, i.e. consist of two or more elements, and are highly directional: to minimize aberrations they must be aligned with the optical axis of the system and the correct side must face the collimated beam; the side with t ...
... (b) focusing a collimated light beam to a point. These lenses are usually achromatic, i.e. consist of two or more elements, and are highly directional: to minimize aberrations they must be aligned with the optical axis of the system and the correct side must face the collimated beam; the side with t ...
Airy disk
In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light. The Airy disk is of importance in physics, optics, and astronomy.The diffraction pattern resulting from a uniformly-illuminated circular aperture has a bright region in the center, known as the Airy disk which together with the series of concentric bright rings around is called the Airy pattern. Both are named after George Biddell Airy. The disk and rings phenomenon had been known prior to Airy; John Herschel described the appearance of a bright star seen through a telescope under high magnification for an 1828 article on light for the Encyclopedia Metropolitana:...the star is then seen (in favourable circumstances of tranquil atmosphere, uniform temperature, &c.) as a perfectly round, well-defined planetary disc, surrounded by two, three, or more alternately dark and bright rings, which, if examined attentively, are seen to be slightly coloured at their borders. They succeed each other nearly at equal intervals round the central disc....However, Airy wrote the first full theoretical treatment explaining the phenomenon (his 1835 ""On the Diffraction of an Object-glass with Circular Aperture"").Mathematically, the diffraction pattern is characterized by the wavelength of light illuminating the circular aperture, and the aperture's size. The appearance of the diffraction pattern is additionally characterized by the sensitivity of the eye or other detector used to observe the pattern.The most important application of this concept is in cameras and telescopes. Owing to diffraction, the smallest point to which a lens or mirror can focus a beam of light is the size of the Airy disk. Even if one were able to make a perfect lens, there is still a limit to the resolution of an image created by this lens. An optical system in which the resolution is no longer limited by imperfections in the lenses but only by diffraction is said to be diffraction limited.