Project

Photonic Crystal Fano Lasers

Publisher

Supervisor

Location

Greater Copenhagen area

A Fano resonance is a general phenomenon occurring in Nature whenever a continuum of states interacts with a single, discrete state. It was suggested that such a resonance can be used to realize an ultra-small laser with remarkable properties, which has led to subsequent analysis and experimental realization.

The laser is realized in a photonic crystal membrane with embedded quantum dots for active material. The Fano resonance occurs due to the interaction of the optical mode in the nanocavity and the continuum of waveguide modes, which leads to a strongly resonant suppression of transmission, effectively forming a narrowband and highly dispersive laser mirror.

Simulations and experiments have demonstrated some remarkable properties of this laser, including the first reported case of laser self-pulsing on a microscopic scale, consistent single-mode lasing and a theoretical frequency modulation bandwidth orders of magnitude larger than conventional semiconductor lasers.

The reflection spectrum may be modified by placing additional air holes in the waveguide below the nanocavity, which can yield asymmetric or inverted spectra compared to the conventional Lorentzian shape. If the waveguide is completely blocked, the in-plane out-coupling is mediated entirely through the nanocavity, yielding a novel laser structure, which may potentially combine the desirable qualities of both the Fano laser and the conventional line-defect lasers.

This modified structure is entirely unexplored as of yet, so the project provides the opportunity to work on a novel structure based on bridging the gap between two separate laser designs with different useful qualities, in order to investigate new physics and design light sources for the photonic integrated circuits of the future.

The project can be tailored to cover a suitable combination of theory, numerical modelling, and experimental work, depending on the interests and competencies of the student(s).

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Contact

Company / Organization

DTU Fotonik

Name

Jesper Mørk

Position

Professor, Gruppeleder

Mail

jesm@fotonik.dtu.dk

Supervisor info

BSc in Physics and Nanotechnology

Supervisor

Jesper Mørk

Co-supervisors

Thorsten Svend Rasmussen

Type

BSc project, MSc thesis

MSc in Engineering, Photonics Engineering

Supervisor

Jesper Mørk

Co-supervisors

Thorsten Svend Rasmussen

Type

BSc project, MSc thesis

MSc in Physics and Nanotechnology

Supervisor

Jesper Mørk

Co-supervisors

Thorsten Svend Rasmussen

Type

BSc project, MSc thesis

Technical University of Denmark

For almost two centuries DTU, Technical University of Denmark, has been dedicated to fulfilling the vision of H.C. Ørsted – the father of electromagnetism – who founded the university in 1829 to develop and create value using the natural sciences and the technical sciences to benefit society.


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