Modulador Acústico-Óptico

4 Novembro 2019, 14:00 • David de Castro Alves

Waveguides

29 Outubro 2019, 09:00 • José Manuel Rebordão

POLARIZATION

Practical analysis of a crystal of calcite, double-refraction and location of the optical axis.

WAVEGUIDES

Rectangular slabs: short analysis following the same approach of the optical fibers.

The complete set of a finite number of orthonormal modes. Its relevance for light coupling into a waveguide.

Attenuation, scattering (Rayleigh) and types of dispersion in optical waveguides: material, intermodal, waveguide dispersion. Relation between attenuation and the awakening of non-linear phenomena.

Presentation by Andreia Domingues: Optical Tweezers

NEXT CLASS

Non-linear optics

Presentation by Andreia Domingues:

BIBLIOGRAPHY

Iizuka, Elements of Photonics, Vol. 2, Caps. 9, 11

Saleh B.E.A, Fundamentals of Photonics, Caps. 8, 9

Filtros Espaciais

28 Outubro 2019, 15:00 • David de Castro Alves

Apresentação resumida de Filtros Espaciais

Alinhamento e medidas

Filtros Espaciais

28 Outubro 2019, 14:00 • David de Castro Alves

Apresentação resumida de Filtros Espaciais

Alinhamento e medidas

WAVEGUIDES

22 Outubro 2019, 09:00 • José Manuel Rebordão

Examples of waveguides; architectures for coupling light into waveguides.

A simple waveguide, a two parallel mirrors waveguide: self-consistency conditions, discretization of angles and wavevector components; field configurations, odd and even modes; relation dispersion; number of modes; set of modes as a basis of functions.

Optical fibers: concept, acceptance angle and Numerical Aperture; information throughput and bandwidth; pulse width increase with propagation; need to reduce the width of the nucleous to reduce the number of modes; limits to the geometrical optics approach.

EM description of step-index cylindrical waveguides: Helmholtz equation in cylindrical coordinates; dependence of azimuthal and radial components on axial component. Solutions of the equations for Ez and Hz with separation of variables: Bessel equations; constrains on the different solutions; constrains on the separation variables; continuity of the tangential components and dispersion relation. Graphical analysis of modes for axial and non-axial modes. Hybrid modes. Monomode waveguides.

NEXT CLASS

Rectangular optical waveguides.

Presentation by Andreia

BIBLIOGRAPHY

Iizuka, Elements of Photonics, Vol. 2, Caps. 9, 11

Saleh B.E.A, Fundamentals of Photonics, Caps. 8, 9