Self-collimation in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="script">P</mml:mi><mml:mi mathvariant="script">T</mml:mi></mml:mrow></mml:math>
-symmetric crystals

Ahmed, W. W.; Herrero, R.; Botey, Muriel; Staliūnas, Kęstutis

doi:10.1103/physreva.95.053830

Cited by 7 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present work, we demonstrate self-collimation in 2-dimensional (2D) Parity (P-) symmetric and Parity Time (PT) symmetric complex lattices (where index and gain/loss modulations are either in phase or de-phased a quarter of the period of the modulation) [9,10]. In this later case, we analyze PT-symmetry in transverse, longitudinal and simultaneously in both directions to study the mode dynamics of self-collimated beams.…”

Section: Introductionmentioning

confidence: 93%

Self-collimated beams in 2D complex periodic lattices from P- to PT-symmetry

Ahmed

Botey

Herrero

et al. 2017

2017 11th International Congress on Engineered Materials Platforms for Novel Wave Phenomena (Metamaterials)

Self Cite

View full text Add to dashboard Cite

We analyze self-collimation in two-dimensional periodic complex lattices. We consider P-symmetric and PT-symmetric complex lattices with different geometries, where the periodic modulations of both refractive index and gain/loss are either in-phase, or dephased a quarter of wavelength of the modulation. The non-diffractive propagation of light beams is analytically predicted using coupled mode approach and further confirmed by numerical integration of a paraxial model.

show abstract

Section: Introductionmentioning

confidence: 93%

Self-collimated beams in 2D complex periodic lattices from P- to PT-symmetry

Ahmed

Botey

Herrero

et al. 2017

2017 11th International Congress on Engineered Materials Platforms for Novel Wave Phenomena (Metamaterials)

Self Cite

View full text Add to dashboard Cite

show abstract

“…In 2D, the number of possible PT-symmetric geometries are enlarged [18]. Here, we just consider the PTsymmetric radial configuration:…”

Section: Figure 1: (A) 1d Pt-axisymmetric Complex Optical Potential mentioning

confidence: 99%

PT-axisymmetric VCSELs with linear central defect

Ahmed

Botey

Herrero

et al. 2017

2017 19th International Conference on Transparent Optical Networks (ICTON)

View full text Add to dashboard Cite

Semiconductor Lasers and particularly Vertical-Cavity Surface-Emitting Lasers (VCSELs) are important laser sources used for many purposes. However, the applications of these lasers are mainly restricted by their strongly multimode operation given by the lack of an intrinsic transverse mode selection mechanism [1]. The introduction of an axial PT-symmetric potential within this kind of lasers is expected to induce a field enhancement and localization at the symmetry axis, central part of the laser. The required complex potential, combining a modulated refractive index and gain-loss distributions, may be achieved by different configurations with actual fabrication techniques.The Complex Ginzburg-Landau equation is used as a simple VCSELs model, and the numerical results show important localization effects; due to the asymmetric mode coupling energy converges to the center leading to a strong light confinement. The main consequence is a narrow and bright laser emission from the central part of the device. As the system nonlinearities introduce saturation limiting the maximum intensity of the output beam, the inclusion of a central linear defect in the structure allows a larger field concentration.

show abstract

“…Some techniques have been proposed to reduce and suppress the MI [1]. Aside, the introduction of non-Hermitian potentials has shown an asymmetric or even unidirectional coupling between modes allowing different spatial effects [2][3].…”

mentioning

confidence: 99%