Category Archives: Ikke kategoriseret

Paper published in Nature Photonics

Check out our recent paper in Nature Photonics, where we control the direction of light emitted from the two-dimensional material MoS2 using thin silicon nanowires. Two different directionality mechanisms are shown experimentally and corroborated with a slightly modified, but simple analytical Mie theory. This work has important applications for many devices that require control over the direction of light, such as displays and single-photon sources.

Directional emission of light using a silicon nanowire.

Starting grant from the Independent Research Fund Denmark

I’m honored and humbled to be one of the recipients of a starting grant from the Independent Research Fund Denmark. Please see the following links for information about my project and the official announcements on the websites of the Independent Research Fund Denmark and the Technical University of Denmark (Danish only):

Independent Research Fund Denmark announcement
Technical University of Denmark announcement

Picture from acceptance ceremony.

 

Research highlighted in Danish newspaper Ingeniøren

My research on the guiding, bending and splitting of light in extremely narrow waveguides (only 25 nm), which was recently published in Nature Communications, has been highlighted in the Danish newspaper Ingeniøren. The full interview with Prof. Sergey I. Bozhevolnyi from SDU Nano Optics can be seen in the online version of the article (Danish only).

Short version of online article published in the newspaper Ingeniøren.

Representative for the Physics and Nanotechnology programme at DTU

A career profile of me has recently been added to website of the Physics and Nanotechnology programme at DTU. This is the same programme I was enrolled in as a bachelor and master student and explains why I chose this particular education. In addition, the profile also describes my current research career path, allowing new students to get an idea of their potential future careers with this education. The full profile can be seen here, unfortunately, only in Danish.

Based on my PhD thesis, which I submitted and defended late last year, I have been selected to receive one of the six “Young Researcher Award” from DTU. I’m extremely happy to receive such a prestigious award, which recognizes my research. The award was presented at the PhD reception, where all PhD graduates within the last year are celebrated and receive their PhD diploma (official announcement).

Diploma of the Young Researcher Award from DTU.

Diploma of the Young Researcher Award from DTU.

META’15 in New York

I will be attending the META’15 conference, which is being held next week in New York. I have a presentation scheduled for Tuesday (August 4th) in the Plasmonics and Nanophotonics I session at 11.15. My presentation is titled “Extremely confined gap surface-plasmon modes probed by electron energy-loss spectroscopy (EELS)” and concerns our research published in Nature Communications last year (link to paper). I hope to see you there. Feel free to drop by after the presentation, if you wish to discuss.

EPS-QEOD Thesis Prize 2015

The European Physical Society (EPS) has awarded me with the Quantum Electronics and Optics Division (QEOD) Thesis Prize 2015 in the category of Fundamental Aspects for my PhD thesis on “Probing plasmonic nanostructures with electron energy-loss spectroscopy (EELS)”. I’m extremely happy and honored for such an international recognition of my work. The prize was bestowed to me during an award ceremony at this year’s CLEO Conference in Munich, Germany.

Raza_EPS-QEOD_Thesis_Prize_Diploma

My diploma of the EPS-QEOD Thesis Prize 2015.

Invited topical review on nonlocal plasmonics

sphere_dimer

Artistic impression of local electric field enhancement in metal dimers due to surface plasmon excitation.

Today, our paper reviewing the current status of nonlocal plasmonics was published in Journal of Physics: Condensed Matter. In this work, we present the governing equations of the nonlocal hydrodynamic and the generalized nonlocal optical response (GNOR) models. The importance of nonlocal response in plasmonics is exemplified by solving these equations for archetypical plasmonic structures, such as the metal sphere and the cylindrical dimer. Much of this work is also available in a longer version in my PhD Thesis.

Paper in Optics Letters now online

After quite some time, our paper entitled “Nonlocal study of ultimate plasmon hybridization” is now available online on the Optics Letters website. In this work, we use our generalized nonlocal optical response (GNOR) model (previously described in this paper) to investigate a dimer consisting of two sodium cylinders in (sub)nanometer proximity. We calculate the extinction cross section and field enhancement, when the gap of the dimer is varied from separated via touching to overlapping dimers. The results show very good agreement with other models (such as density-functional theory) and, more importantly, with experimental observations. Using transformation optics, we consider the touching case in more detail and show that the resonance energies of macroscopic touching cylinders depends on the microscopic properties of the electron gas of the metal.