This book examines the full hierarchy of these systems, from 1D to 2D and 3D, from photonic crystals and random microresonator chains to quasi crystals. It treats photon transport as well as photon generation and random lasing, and deals with semiconductors, organics and glass materials. Aug 20, 2015 · The reference introduces the reader to light propagation and emission in complex photonic media, which includes random, heterogeneous and fractal photonic structures. A broad coverage of 1-D, 2-D and 3-D photonic quasi crystals provides mode structures and interaction in random. List of contributors; Preface; 1. Light propagation and emission in complex photonic media W. L. Vos, A. Lagendijk and A. P. Mosk; 2. Transport of localized waves via modes and channels A. Genack and Z. Shi; 3. Modes structure and interaction in random lasers M. Leonetti and C. Lopez; 4. Ordered and disordered light transport in couple microring resonators S. Mookherjea; 5. One-dimensional.
Aug 15, 2017 · Fig. 1. Wrinkle lithography combined with concurrent design methodology for the fabrication of quasi-random nanostructures. A Process of wrinkle lithography to fabricate quasi-random nanostructures and B concurrent design approach to search the optimal structures for the broadband, light-trapping property.C A thin-film light-trapping photonic device with resulting pattern. Mar 10, 2017 · A directional random laser mediated by transverse Anderson localization in a disordered glass optical fiber is reported. Previous demonstrations of random lasers have found limited applications. Read "Light Localisation and Lasing Random and Quasi-random Photonic Structures" by available from Rakuten Kobo. The properties of quasi-random and random photonic systems have been extensively studied over the last two decades, but.
Mar 30, 2012 · Random lasing occurring from multiple light scatterings and the interference effect of the scattered light has various complex lasing states in disordered structures, in which light waves are localized in various forms. Modes of random lasing are generally classified into localized, extended and transition modes based on their localization types. Localization of the laser modes within the stop band is assigned to defect states caused by crystal structure faults. We distinguish this photonic lasing mechanism from another regime of stimulated emission associated with random lasing what could be also observed in dye-infiltrated opals, but at higher excitation intensities.
Oct 01, 2012 · Hereafter we investigate the formation of photonic stop-bands in quasi-random NAA structures. A superposition of the stop-bands from the triangular periodic arrangement of their domains leads to the formation of a general PBG. Given that the orientation of the domains is random, the investigated structures are isotropic in a macroscopic sense. Jun 16, 2017 · Unlike the conventional photonic crystals with periodic structures, quasi-random nanostructures comprise seemingly random material distributions. of random lasing, and the rich physics of amplifying random systems, it is important to provide a clear deﬁnition of what is meant by a random laser. A good deﬁnition of a laser is an optical structure or material that satisﬁes the following two criteria: 1 light is. Apr 26, 2015 · This parameter gauges the interaction of light with any complex photonic medium, and allows to compare complex media from different classes for similar applications. Comments: 8 pages, 2 figures, Light Localisation and Lasing: Random and Quasi-Random Photonic Structures, Eds. M. Ghulinyan and L. Pavesi, Cambridge Univ. Press, Cambridge, 2015. The dependence of the lasing threshold on the amount of positional disorder in photonic crystal structures is newly studied by means of the finite element method, not of the finite difference time domain method usually used. A two-dimensional model of a photonic crystal consisting of dielectric cylinders arranged on a triangular lattice within a circular region is considered.
mechanism of the bandgap formation, light localization and focusing [2, 3, 6]. Unlike periodic photonic structures or PhQs, deterministic aperiodic DA photonic structures lack both translational and rotational symmetry but display remarkable self-similarity scale invariance symmetry in their structural and spectral features. Such structures. the lasing mode dominates over the in-plane leakage. The lasing modes in a photonic polycrystalline move away from the center frequency of the photonic band gap to reduce the out-of-plane leakage. In a photonic amorphous structure, the short-range order improves optical conﬁnement and enhances the quality factor of resonances.
Three-dimensional photonic crystals 3D PhCs are a fascinating platform for manipulating photons and controlling their interactions with matter. One widely investigated structure is the layer-by-layer woodpile structure, which possesses a complete photonic bandgap. On the other hand, other types of 3D PhC structures also offer various possibilities for controlling light by utilizing the three. This parameter gauges the interaction of light with any complex photonic medium, and allows to compare complex media from different classes for similar applications.Comment: 8 pages, 2 figures, Light Localisation and Lasing: Random and Quasi-Random Photonic Structures, Eds. M. Ghulinyan and L. Pavesi, Cambridge Univ. Press, Cambridge, 2015 Ch.
Random lasing was experimentally investigated in pyrromethene 597-doped strongly disordered chiral liquid crystals CLCs composed of the nematic liquid crystal SLC1717 and the chiral agent CB15. The concentration of the chiral agent tuned the bandgap, and disordered CLC microdomains were achieved by fast quenching of the mixture from the isotropic to the cholesteric phase. Anderson localization in random structures is an intriguing physical phenomenon, for which experimental verifications are far behind theoretical predictions. We report the first experimental confirmations of photonic band-tail states and a complete transition of Anderson localization. An optically activated photonic crystal alloy platform enables the acquisition of extensive experimental. Mher Ghulinyan, "Light Localisation and Lasing: Random and Quasi-random Photonic Structures" English ISBN: 1107038774 2015 260 pages PDF 21 MB. This proposed procedure can produce the black silicon with random and quasi-random structures which can enable efficient light trapping, harvesting and expected to possess better electrical properties. It is envisaged that such structures are highly desirable for better efficiencies in solar cells and future research will be in this direction. A most well-known example is the random laser, in which lasing action is sustained by multiple scattering of light within the disordered media. Disordered structures are also proposed for the applications including wavelength filters, optical switches, sensors and cavity quantum electrodynamics.
Ghulinyan M. & Pavesi L. eds Light Localisation and Lasing: Random and Pseudo-random Photonic Structures Cambridge University Press, 2014. Wiersma D. S. The physics and applications of random lasers. Nature Physics 4, 359–367 2008. Letokhov V. S. Generation of light by a scattering medium with negative resonance absorption. of Anderson localization in random lasing16. In diffusive random lasers the lasing wavelength is primarily determined by the spectral peak of the gain medium7, while only weak dispersion is incorporated into the multiple-scattering medium, enabling modest tunability of the random laser10,26.A photonic-crystal waveguide, in contrast, is highly.
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