منابع مشابه
Photonic band-gap structures
The analogy between electromagnetic wave propagation in multidimensionally periodic structures and electronwave propagation in real crystals has proven to be a fruitful one. Initial efforts were motivated by the prospect of a photonic band gap, a frequency band in three-dimensional dielectric structures in which electromagnetic waves are forbidden irrespective of the propagation direction in sp...
متن کاملAngular photonic band gap
Materials and structures that strongly discriminate electromagnetic radiation based on one, or more of its properties (e.g. polarization, frequency) play an enabling role for a wide range of physical phenomena. For example, polarizers can selectively transmit light based on its polarization [1] over a wide range of frequencies; photonic crystals [2] (PhCs) can reflect light of certain frequenci...
متن کاملWavelength splitting in photonic band-gap structures with multiple defects
We explain the physical effects involved in optical coupling in periodic structures which allow for photonic band gaps. We use a simple model to do this, since this allows us to establish some general principles for the operation of such devices. Further, we investigate the choice of parameters, with respect to the band gap, which will allow the device to operate suitably, and we contrast syste...
متن کاملTwo-dimensional photonic band-gap structures as quasi-metals.
By considering waves that propagate out of the transverse plane, we show that common high-index materials (e.g., GaAs) with a two-dimensional array of air holes can act in some ways as three-dimensional photonic band-gap structures. In particular, we describe a dielectric quasi-metal that ref lects all propagating light incident from free space.
متن کاملA new topology optimization algorithm for photonic band gap structures
A new topology optimization algorithm is proposed based on bi-directional evolutionary structural optimization (BESO) method in order to design photonic crystals with maximum band gaps. The optimization process starts from a simple unit cell without band gap, and the photonic crystals are assumed to be periodically composed of two materials with different permittivity. Based on finite element a...
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ژورنال
عنوان ژورنال: Journal of the Optical Society of America B
سال: 1993
ISSN: 0740-3224,1520-8540
DOI: 10.1364/josab.10.000283