periodic structure वाक्य
उदाहरण वाक्य
मोबाइल
- In an ideal infinite crystal, the equilibrium position of each individual atom is determined by the forces exerted by all the other atoms in the crystal, resulting in a periodic structure.
- In general, Bloch oscillations are a consequence of the periodic structure of the lattice potential and the existence of a maximum value of the Bloch wave vector k _ { max }.
- More generally, for periodic structures having discrete translational symmetry, the solutions take the form of Bloch waves, most famously in crystalline atomic materials but also in photonic crystals and other periodic wave equations.
- Recently, a graphene-based Bragg grating ( one-dimensional photonic crystal ) has been fabricated and demonstrated its competence for excitation of surface electromagnetic waves in the periodic structure using a prism coupling technique.
- A periodic structure can support both forward and backward space harmonics, which are not modes of the field, and cannot exist independently, even if a beam can be coupled to only one of them.
- The reciprocal lattice plays a fundamental role in most analytic studies of periodic structures, particularly in the Laue conditions the momentum difference between incoming and diffracted X-rays of a crystal is a reciprocal lattice vector.
- Non-periodic tilings can also be obtained by projection of higher-dimensional structures into spaces with lower dimensionality and under some circumstances there can be tiles that enforce this non-periodic structure and so are aperiodic.
- A graphene-based Bragg grating ( one-dimensional photonic crystal ) has been fabricated and demonstrated its capability for excitation of surface electromagnetic waves in the periodic structure by using He Ne laser as the light source.
- A perfect crystal lattice, with low enough thermal motion and no deviations from periodic structure, would have no resistivity, but a real metal has crystallographic defects, impurities, multiple isotopes, and thermal motion of the atoms.
- Another strand of research has tried to construct three-dimensional photonic structures from self-assembly essentially letting a mixture of dielectric nano-spheres settle from solution into three-dimensionally periodic structures that have photonic band-gaps.
- Recently, researchers fabricated a graphene-based Bragg grating ( one-dimensional photonic crystal ) and demonstrated that it supports excitation of surface electromagnetic waves in the periodic structure by using 633 nm He-Ne laser as the light source.
- These include an explanation of the nature of leaky waves and how to calculate them, a new derivation for small aperture and small obstacle expressions, radial and spherical transmission line theories, new results for propagation through periodic structures, and so on.
- "' Extraordinary optical transmission "'( "'EOT "') is the phenomenon of greatly enhanced transmission of light through a subwavelength aperture in an otherwise opaque metallic film which has been patterned with a regularly repeating periodic structure.
- This feature, in combination with the fact that the molecules have well-defined ends, differentiates EMACs from other kinds of molecular wires : EMACs exist only as distinct molecular entities, they do not aggregate and they do not form periodic structures of repeating units.
- This periodic wavefront can be generated by spatially coherent illumination of a periodic structure, like a diffraction grating, and if so the intensity distribution of the wave field at the Talbot length resembles exactly the structure of the grating and is called a self-image.
- Although Sallust s purposes in writing have been debated over the years, it seems logical to classify him as a senatorial historian who adopted the attitude of a anaphora, and chiasmus reflect preference for the old-fashioned Latin style of Cato to the Ciceronian periodic structure of his own era.
- Every crystal is a periodic structure which can be characterized by a Bravais lattice, and for each Bravais lattice we can determine the reciprocal lattice, which encapsulates the periodicity in a set of three reciprocal lattice vectors ( "'b 1, b 2, b 3 "').
- In conclusion one can say that the exit-wave function reconstruction method has most advantages for determining the ( aperiodic ) atomic structure of defects and small clusters and CIP is the method of choice if the periodic structure is in focus of the investigation or when defocus series of HREM images cannot be obtained, e . g . due to beam damage of the sample.
- An extension of the mechanism was also proposed to account for the development of periodic structures with periodicity larger than the laser beam's wavelength ( i . e . grooves ) that are formed perpendicularly to the subwavelength-sized ripples; the proposed physical mechanism assumes the suppression of surface plasmon excitation followed by the formation of hydrothermal convection rolls that propagate parallel to the electric field polarisation.
- The Forouhi-Bloomer dispersion equations in combination with " Rs " and " Rp ", must be collected over a large wavelength range from a periodic structure ( grating ), and then analyzed with a model that incorporates Forouhi-Bloomer dispersion equations and RCWA . Inputs into the model include grating pitch and " n " and " k " spectra of all materials within the structure, while outputs can include Depth, CDs at multiple locations, and even sidewall angle.
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