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Photonic crystal

About: Photonic crystal is a research topic. Over the lifetime, 43424 publications have been published within this topic receiving 887083 citations.


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Journal ArticleDOI
TL;DR: In this article, the authors present a review on the fundamental physical aspects, methods of theoretical analyses, experimental techniques to realize two-dimensional sonic crystals, wave-guides and coupled waveguides, and finally ideas of sonic circuits built in sonic-crystal slabs.
Abstract: A sonic crystal is a finite-size periodic array composed of scatterers embedded in a homogeneous material. It should have full band-gaps where any sound wave is not allowed to propagate but is reflected completely. It is actually a sonic version of a photonic crystal. Since similarities and differences between the photonic and electronic band structures were discussed and summarized in 1993 by Yablonovitch, photonic crystals have been intensively investigated from the physical and application-oriented points of view. In the same time frame, sonic and phononic crystals have been discussed to realize acoustic band-gaps, wave-guides and filters. Their first experimental realizations of full band-gaps were both reported in 1998. Two-dimensional sonic crystals of rigid cylinders in air have been recently revealed to be promising for acoustical coupled wave-guides constructed in a sonic-crystal slab. This review focuses on sonic crystals corresponding to photonic crystals, and reviews papers on the fundamental physical aspects, methods of theoretical analyses, experimental techniques to realize two-dimensional sonic crystals, wave-guides and coupled wave-guides, and finally ideas of sonic circuits built in sonic-crystal slabs.

177 citations

Journal ArticleDOI
TL;DR: The dispersion properties of large hole photonic crystal fibers (PCFs) are tailored by changing the diameter of the air-holes belonging to the first three rings, in order to obtain fibers with a small effective area and low dispersion values in a wide wavelength range around 1550 nm as mentioned in this paper.
Abstract: The dispersion properties of large-hole photonic crystal fibers (PCFs) are tailored by changing the diameter of the air-holes belonging to the first three rings, in order to obtain fibers with a small effective area and low dispersion values in a wide wavelength range around 1550 nm. Highly nonlinear triangular PCFs with effective area of a few square micrometers, flattened dispersion curve, and zero-dispersion wavelength around 1500 nm have been designed.

177 citations

Patent
04 Nov 2005
TL;DR: A planar optical platform for generating a Raman signal from a foreign object comprises an input region and an output region, for receiving and extracting optical radiation, optically coupled to a plasmonic band structure region as discussed by the authors.
Abstract: A planar optical platform for generating a Raman signal from a foreign object comprises an input region and an output region, for receiving and extracting optical radiation, optically coupled to a plasmonic band structure region. The plasmonic band structure region comprises a layer of a first material, having a first refractive index, patterned with an array of sub-regions of a second material, having a second refractive index, wherein a side-wall of each sub-region is coated with a metallodielectric layer. The array of sub-regions gives rise to a plasmonic band structure and, in use, each sub-region confines a plasmon resonance excited by optical radiation coupled into the plasmonic band structure region, which gives rise to a Raman signal from a foreign object placed proximate the plasmonic band structure region. The platform may be incorporated into a spectroscopic measurement system and is particularly useful for surface-enhanced Raman spectroscopy of analyte molecules.

176 citations

Journal ArticleDOI
TL;DR: In this article, the optical properties of a photonic crystal interfaced with a uniform medium with the negative dielectric constant or with another non-magnetic crystal were studied.
Abstract: We study the optical properties of a photonic crystal interfaced with a uniform medium with the negative dielectric constant or with another photonic crystal. We show that, at such an interface, nonpropagating surface states may arise. These states result in a sharp feature in the transmission and reflection spectra of the system. We also show that interfacing magnetic and nonmagnetic photonic crystals gives rise to giant Faraday and Kerr effects.

176 citations

Journal ArticleDOI
22 Apr 2020-Nature
TL;DR: This work theoretically propose and experimentally demonstrate a class of resonances in photonic crystal slabs that radiate only towards one side of the slab, with no mirror placed on the other side, and finds them to be topological in nature.
Abstract: Unidirectional radiation is important for various optoelectronic applications, such as lasers, grating couplers and optical antennas. However, almost all existing unidirectional emitters rely on the use of materials or structures that forbid outgoing waves—that is, mirrors, which are often bulky, lossy and difficult to fabricate. Here we theoretically propose and experimentally demonstrate a class of resonances in photonic crystal slabs that radiate only towards one side of the slab, with no mirror placed on the other side. These resonances, which we name ‘unidirectional guided resonances’, are found to be topological in nature: they emerge when a pair of half-integer topological charges1–3 in the polarization field bounce into each other in momentum space. We experimentally demonstrate unidirectional guided resonances in the telecommunication regime by achieving single-side radiative quality factors as high as 1.6 × 105. We further demonstrate their topological nature through far-field polarimetry measurements. Our work represents a characteristic example of applying topological principles4,5 to control optical fields and could lead to energy-efficient grating couplers and antennas for light detection and ranging. Unidirectional radiation is achieved in a photonic crystal slab without the use of mirrors by merging a pair of topological defects carrying half-integer charges.

176 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023748
20221,590
20211,207
20201,455
20191,643
20181,683