Photonic crystal fiber PCF is a kind of optical fiber that uses photonic crystals to form the cladding around the core of the cable.
Witzens, Jeremy Dispersion in photonic crystals. Photonic crystals are periodic mesoscopic arrays of scatterers that modify the propagation properties of electromagnetic waves in a similar way as "natural" crystals modify the properties of electrons in solid-state physics.
In this thesis photonic crystals are implemented as planar photonic crystals, i. Photonic crystals can feature forbidden frequency ranges the band-gaps in which light cannot propagate.
Even though most work on photonic crystals has focused on these band-gaps for application such as confinement and guiding of light, this thesis focuses on the allowed frequency regions the photonic bands and investigates how the propagation of light is modified by the crystal lattice.
In particular the guiding of light in bulk photonic crystals in the absence of lattice defects the self-collimation effect and the angular steering of light in photonic crystals the superprism effect are investigated.
The latter is used to design a planar lightwave circuit for frequency domain demultiplexion. Difficulties such as efficient insertion of light into the crystal are resolved and previously predicted limitations on the resolution are circumvented.
The demultiplexer is also fabricated and characterized. Monolithic integration of vertical-cavity surface-emitting lasers by means of resonantly enhanced grating couplers is investigated. The grating coupler is designed to bend light through a ninety-degree angle and is characterized with the finite-difference time-domain method.
The vertical-cavity surface-emitting lasers are fabricated and characterized. A purely theoretical section of the thesis investigates advanced data processing techniques for the finite-difference time-domain method.
In particular it is shown that an inner product can be used to filter out specific photonic crystal modes or photonic crystal waveguide modes Bloch-modes.
However it is also shown that the numerical accuracy of this inner product severely worsens for Bloch modes with very low group velocities.Photonic Crystal Fiber (PCF) Thorlabs offers a selection of photonic crystal fibers (PCF), provided by NKT Photonics, to provide high confinement of transmitted light.
These options include air guided, polarization-maintaining, endlessly single mode and large-mode-area fibers. A THESIS submitted in partial fulfillment of the requirements for the degree MASTER OF SCIENCE Department of Physics Figure 1 This depicts the fiber end of a kagome hollow core photonic crystal fiber.
The image on the left has a core size of one cell and the . Using fiber draw techniques developed for communications fiber it meets these two requirements, and photonic crystal fibres are commercially available.
Another promising method for developing two-dimensional photonic crystals is the so-called photonic crystal slab. Photonic crystal fibers (PCFs) are optical fibers that employ a microstructured arrangement of material in a background material of different refractive index.
The background material is often undoped silica and a low index region is typically provided by air voids running along the length of the fiber. In this thesis, the use of photonic crystal cavities for experiments in cavity quantum-electrodynamics is described.
The diploma project will be carried out at the Photonics Laboratory, Liquid Crystal Group, MC2, Chalmers. It involves collaborations with the COM center, Technical University of Denmark (DTU), where a PhD project is currently being carried out on the topic of liquid crystal-filled PCFs; and, with the company Crystal Fibre A/S, in Denmark. Photonic crystal fiber (PCF) is a kind of optical fiber that uses photonic crystals to form the cladding around the core of the cable. Photonic crystal is a low-loss periodic dielectric medium constructed using a periodic array of microscopic air holes that run along the entire fiber length. In this thesis photonic crystals are implemented as planar photonic crystals, i.e., optically thin semiconductor films with periodic arrays of holes etched into them, with a hole-to-hole spacing of the order of the wavelength of light in the dielectric media.
To this end, the propagation of light in photonic crystals, and the creation of cavities by making defects in the photonic crystal lattice, is discussed.
The diploma project will be carried out at the Photonics Laboratory, Liquid Crystal Group, MC2, Chalmers. It involves collaborations with the COM center, Technical University of Denmark (DTU), where a PhD project is currently being carried out on the topic of liquid crystal-filled PCFs; and, with the company Crystal Fibre A/S, in Denmark.