Hasil untuk "physics.optics"

Bahram Mashhoon, Yu. N. Obukhov

We discuss the coupling of photon spin with rotation in connection with a recent proposal of Fedderke et al. [arXiv:2406.16178 [physics.optics]] regarding a precision gyroscope based on the intrinsic spin of light. To this end, we analyze the propagation of electromagnetic radiation in a physical system that uniformly rotates about the direction of wave propagation in the presence of an ambient medium. Finally, we consider the possibility of using this type of spin-of-light gyroscope to measure gravitomagnetic fields.

Miao Li, R. Miao, Y. Pang

Ziqui Shao, Zhaoying Wang

A generalized coordinate-independent expression for the evolution of light beam on curved space is derived.

D. Franz, R. Nicolas, W. Boutu et al.

Nanoscale amplification of non-linear processes in solid-state devices opens novel applications in nano-electronics, nano-medicine or high energy conversion for example. Coupling few nano-joules laser energy at a nanometer scale for strong field physics is demonstrated. We report enhancement of high harmonic generation in nano-structured semiconductors using nanoscale amplification of a mid-infrared laser in the sample rather than using large laser amplifier systems. Field amplification is achieved through light confinement in nano-structured semiconductor 3D waveguides. The high harmonic nano-converter consists of an array of zinc-oxide nanocones. They exhibit a large amplification volume, 6 orders of magnitude larger than previously reported [1] and avoid melting observed in metallic plasmonic structures. The amplification of high harmonics is observed by coupling only 5-10 nano-joules of a 3.2 µm high repetition-rate OPCPA laser at the entrance of each nanocone. Harmonic amplification (factor 30) depends on the laser energy input, wavelength and nanocone geometry [2]. [1] Vampa et al., Nat. Phys. 13, 659–662 (2017). [2] Franz et al., arXiv:1709.09153 [physics.optics] (2017)

Lena, Uliar, Ario et al.

K. A.P., Onijnenberg, Eixin et al.

Z. Jacob, S. Pendharker, Yu Guo et al.

M. Othman, Farshad Yazdi, A. Figotin et al.

Giant Gain Enhancement in Photonic Crystals with a Degenerate Band Edge Mohamed A. K. Othman 1 , Farshad Yazdi 1 , Alex Figotin 2 and Filippo Capolino 1 Department of Electrical Engineering and Computer Science, University of California, Irvine, Irvine, CA,.92697 USA Department of Mathematics, University of California, Irvine, Irvine, CA, 92697 USA arXiv:1411.0657v3 [physics.optics] 8 Dec. 2015 {mothman, fyazdi, afigotin, f.capolino}@uci.edu We propose a new approach leading to giant gain enhancement. It is based on unconventional slow wave resonance associated to a degenerate band edge (DBE) in the dispersion diagram for a special class of photonic crystals supporting two modes at each frequency. We show that the gain enhancement in a Fabry-Perot cavity (FPC) when operating at the DBE is several orders of magnitude stronger when compared to a cavity of the same length made of a standard photonic crystal with a regular band edge (RBE). The giant gain condition is explained by a significant increase in the photon lifetime and in the local density of states. We have demonstrated the existence of DBE operated special cavities that provide for superior gain conditions for solid-state lasers, quantum cascade lasers, traveling wave tubes, and distributed solid state amplifiers. We also report the possibility to achieve low-threshold lasing in FPC with DBE compared to RBE-based lasers. I. INTRODUCTION Light confinement using either mirrors or Bragg reflectors provides for high quality (Q)-factor in Fabry-Perot cavity (FPC) resonators and enhanced optical field intensity. Such cavities are commonly used for laser applications and spectroscopy. An important class of high Q-factor structures is formed by slow-wave resonators based on the regular band edge (RBE) of the wavenumber-frequency dispersion diagram relative to photonic crystals, whose simplest architecture is a periodic stack of dielectric layers, with one dimensional periodicity [1–3]. More elaborate designs of nanocavities adopted Silicon heterostructures [4], liquid crystals [5] technologies and demonstrated improved Q-factor compared to previously reported designs. The use of photonic crystals resulted in enhanced amplification properties for low-threshold lasing [2,6], enhanced directional- wave propagation through magneto-optical effects [7–9], nonlinear optics [10] and quantum processing [11]. Pursuing better performing photonic crystal cavities is essential to further advancement of photonic technology [12–15], and photonic integrated circuits [16–18] in particular. These advancement established a basis for a novel class of solar cell architecture with enhanced absorption [19–21], and other thin film applications [22], along with superior atomic interaction with strongly localized photons [23], and unconventional spontaneous emission dynamics [24,25]. Slow light in photonic crystals is yet another fundamental utility that can tailor the electromagnetic response and achieve superior performance through dispersion engineering [26–28]. Figotin and Vitebsky in [29–33], proposed FPC resonators made of unconventional photonic crystals composed by anisotropic dielectric layers. Those FPC resonators exhibit sharper transmission peaks, higher Q-factors, and better general performance in a vicinity of the photonic band edge frequency compare to conventional photonic crystal FPCs of the same size made of isotropic layers. The related field enhancement properties in those unconventional structures can be attributed to the degenerate band edge (DBE) conditions. This special DBE condition produces some four electromagnetic modes (EM) at the DBE frequency; that phenomenon does not occur in regular photonic crystals, i.e., conventional photonic crystals exhibiting an RBE providing a single EM mode operation. Consequently, it is important to acknowledge that the resonance characteristics in DBE cavities studied in this paper are fundamentally different from those in standard band-gap cavities [2,3,34,35]. Significant differences between DBE and RBE based FPCs are highlighted in Sec. II. The principal result of this paper that the DBE condition based on resonance properties discussed in [29–33] lead to giant power gain when an active

M. Sumetsky

A tunable bottle microresonator can trap an optical pulse of the given spectral width, hold it as long as the material losses permit, and release without distortion.

Stevan Urošević

Removed by arXiv administrators because submission violated the terms of arXiv's license agreement.

Juan Miguel Auñon, Manuel Nieto-Vesperinas

This is the supplementary information to arXiv:1303.4545v1 [physics.optics] 19 Mar 2013 in which we address the forces exerted by the electromagnetic field emitted by a planar uctuating source on dielectric particles that have arose much interest because of their recently shown magnetodielectric behavior.

M. Sumetsky

A low-loss CROW delay line with a weak inter-resonator coupling determined by the Kac matrix is dispersionless and can be easily impedance-matched by adjusting the coupling to the input/output waveguide.

M. Zamboni-Rached, E. Recami, I. Besieris

Our aim in this paper is to recall some essential points of "Extended special Relativity", now more correctly called "Non-Restricted special Relativity" theory (NRR), and in particular of the extended Maxwell Equations; as well as to set forth some further comments on the basic differences between Cherenkov Radiation and the so-called X-shaped Waves, met within the more recent realm of the Non-diffracting Waves (also known as Localized Waves). The occasion is furnished by some very recent Seshadri's comments[1] on a previous article of ours, titled "Cherenkov radiation versus X-shaped localized waves" (see[2], and arXiv:0807.4301[physics.optics]), and not less on NRR itself. OCIS codes: 320.5550; 350.7420; 070.7345; 350.5500; 070.0070; 100.7410; 050.050; 000.1600; 000.2690; 000.6800; 250.5530; 260.0260. PACS nos.: 41.60.Bq; 03.50.De; 03.30.+p; 41.20;Jb; 04.30.Db; 42.25.-p; 42.25.Fx; 47.35.Rs. Keywords: Non-diffracing Waves; Localized Waves; Cherenkov radiation; X-shaped waves; Wave equations; Bessel beams; Superluminal pulses; Maxwell equations; Special Relativity; Non-restricted Special Relativity; Extended special Relativity; Lorentz transformations; Superluminal point-charges.

V. O. Sokolov, V. G. Plotnichenko, E. M. Dianov

IR luminescence and absorption in bismuth-doped silica glass-core fibers observed recently (see [arXiv:1106.2969v1 [physics.optics]) are argued to be caused by transitions in interstitial BiO molecules

Li-Gang Wang

It is shown that the spatial Goos-Hänchen shift is greatly affected by spatial coherence. A typical example is given.

Adrian C. Melissinos

It is suggested that slow light could be used to test for relative motion with respect to an absolute reference frame at a sensitivity v ~ 10^{-3} m/s.