Projekt

Photonic Crystal Fano Lasers

Udbyder

Vejleder

Sted

København og omegn

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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Kontakt

Virksomhed/organisation

DTU Fotonik

Navn

Jesper Mørk

Stilling

Professor, Gruppeleder

Mail

jesm@fotonik.dtu.dk

Vejleder-info

Bachelor i Fysik og Nanoteknologi

Vejleder

Jesper Mørk

Medvejledere

Thorsten Svend Rasmussen

Type

Bachelorprojekt, Kandidatspeciale

Kandidatuddannelsen i Fotonik

Vejleder

Jesper Mørk

Medvejledere

Thorsten Svend Rasmussen

Type

Bachelorprojekt, Kandidatspeciale

Kandidatuddannelsen i Fysik og Nanoteknologi

Vejleder

Jesper Mørk

Medvejledere

Thorsten Svend Rasmussen

Type

Bachelorprojekt, Kandidatspeciale

OM DTU

DTU er et teknisk eliteuniversitet med international rækkevidde og standard. Vores mission er at udvikle og nyttiggøre naturvidenskab og teknisk videnskab til gavn for samfundet. 10.000 studerende uddanner sig her til fremtiden, og 5.700 medarbejdere har hver dag fokus på uddannelse, forskning, myndighedsrådgivning og innovation, som bidrager til øget vækst og velfærd.

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Anker Engelunds Vej 1
Bygning 101A
2800 Kgs. Lyngby


45 25 25 25

dtu@dtu.dk

CVR-nr. 30 06 09 46

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