Prof. Martijn Wubs Profile

Prof. Martijn Wubs

Professor at Technical Univ of Denmark

SPIE Involvement:

Author

Area of Expertise:

nanophotonics , quantum optics , theory , nanoplasmonics , solid state quantum information

Websites:

Personal Website | Company Website

Proceedings Article | 3 September 2019 Presentation + Paper

Preparing pure states with lossy beam splitters using quantum coherent absorption of squeezed light

Martijn Wubs, Ali Ü. C. Hardal

Proceedings Volume 11091, 110910Z (2019) https://doi.org/10.1117/12.2529576

KEYWORDS: Absorption, Beam splitters, Quantum cryptography, Coherence (optics), Graphene, Nanostructuring, Quantum optics, Optical components, Photons, Quantum physics

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Proceedings Article | 23 May 2018 Presentation

An analytical approach to collective effects in nanolasers (Conference Presentation)

Emil André, Igor Protsenko, Alexander Uskov, Jesper Mørk, Martijn Wubs

Proceedings Volume 10682, 106820R (2018) https://doi.org/10.1117/12.2307100

KEYWORDS: Polarization, Free space, Numerical analysis, Statistical analysis

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Traditionally, the active material in a laser is modelled as independent emitters, but in recent years it has become increasingly clear that radiative coupling between emitters can significantly change the characteristics of small lasers. Collective effects in free space such as superradiance have been studied extensively [1,2], but the effects of inter-emitter correlation in micro- and nano-cavities need further examination to be put on firm theoretical ground. Several studies of collective effects in nano-cavities have been made [3-6], but the theoretical models employed are intricate, and numerical methods are needed both to generate the dynamic equations and to solve them. We propose a model where the complexity is strongly reduced, allowing analytical solutions [7]. We consider a collection of identical two-level emitters interacting with a single cavity mode. We start from Maxwell-Bloch equations, but instead of making the typical adiabatic elimination of the polarization, we allow the polarization decay rate to be of the same magnitude or smaller than other decay rates. Hence, the traditional laser rate equations for the photon number and the population inversion must be supplemented by equations for the emitter-field correlation and the emitter-emitter correlation. This gives us four generalized laser rate equations, which we solve analytically in steady state. Comparing with the steady state results obtained from the traditional laser rate equations we see that inclusion of collective effects leads to a reduction of the photon number for small pump rates, similarly to what is found in [4]. From the generalized laser rate equations, we derive a measure of the strength of collective effects in terms of laser parameters: This describes the difference between results with and without inter-emitter correlations, and it goes smoothly to zero as we approach parameter values where the traditional laser rate equations become valid. To gain insight into the photon statistics of the laser, we construct dynamic equations for higher order correlations of operators. We derive an analytical expression for the zero-delay photon auto-correlation function, and for low pump rates we find that the interaction of emitters results in super-thermal values of the auto-correlation. This feature is observed in experiments and numerical models [4-5], and with our analytical expressions, we are able to pinpoint the parameter combinations for which the collective effects have the largest impact. Considering the same model in terms of the Fourier components of the operators, we find results for the photon number that agree well with the previous approach, while allowing computation of the linewidth. Thus, we can examine how emitter-emitter correlation affects the line broadening of the laser.

Proceedings Article | 16 September 2016 Presentation + Paper

Quantum optical effective-medium theory and transformation quantum optics for metamaterials

Martijn Wubs, Ehsan Amooghorban, Jingjing Zhang, N. Asger Mortensen

Proceedings Volume 9918, 99180P (2016) https://doi.org/10.1117/12.2239328

KEYWORDS: Geometrical optics, Quantum optics, Quantum physics, Metamaterials, Electromagnetism, Photons, Dielectrics, Quantum electrodynamics, Electroluminescent displays, Neodymium

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Proceedings Article | 11 September 2013 Paper

Nonlocal modification and quantum optical generalization of effective-medium theory for metamaterials

Martijn Wubs, Wei Yan, Ehsan Amooghorban, N. Asger Mortensen

Proceedings Volume 8806, 88061F (2013) https://doi.org/10.1117/12.2024465

KEYWORDS: Metamaterials, Quantum optics, Quantum physics, Lab on a chip, Dielectrics, Metals, Near field optics, Near field, Homodyne detection, Multilayers

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Proceedings Article | 15 October 2012 Paper

Effects of nonlocal response on the density of states of hyperbolic metamaterials

Wei Yan, Martijn Wubs, N. Mortensen

Proceedings Volume 8455, 84550V (2012) https://doi.org/10.1117/12.929478

KEYWORDS: Metamaterials, Metals, Dielectrics, Gold, Thulium, Plasmonics, Lab on a chip, Dispersion, Photonics, Surface plasmon polaritons

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Proceedings Article | 21 February 2012 Paper

Are there novel resonances in nanoplasmonic structures due to nonlocal response?

Martijn Wubs, Søren Raza, Giuseppe Toscano, Antti-Pekka Jauho, N. Asger Mortensen

Proceedings Volume 8260, 82601E (2012) https://doi.org/10.1117/12.908404

KEYWORDS: Metals, Plasmonics, Nanostructures, Plasma, Nanoplasmonic structures, Nanoplasmonics, Interfaces, Polarization, Nanotechnology, Nanowires

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SPIE Journal Paper | 1 January 2011

Field enhancement at metallic interfaces due to quantum confinement

Z. Fatih Öztürk, Sanshui Xiao, Min Yan, Martijn Wubs, Antti-Pekka Jauho, Niels Mortensen

JNP, Vol. 5, Issue 01, 051602, (January 2011) https://doi.org/10.1117/12.10.1117/1.3574159

KEYWORDS: Interfaces, Metals, Dielectrics, Plasmonics, Surface enhanced Raman spectroscopy, Raman spectroscopy, Quantum physics, Photonics, Numerical analysis, Maxwell's equations

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Proceedings Article | 11 September 2010 Paper

Plasmonic nanostructures: local versus nonlocal response

Giuseppe Toscano, Martijn Wubs, Sanshui Xiao, Min Yan, Z. Fatih Öztürk, Antti-Pekka Jauho, N. Mortensen

Proceedings Volume 7757, 77571T (2010) https://doi.org/10.1117/12.860774

KEYWORDS: Metals, Plasmonics, Nanostructures, Electrons, Nanoplasmonic structures, Quantum electronics, Dielectrics, Optical properties, Nanorods, Nanowires

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Showing 5 of 8 publications

Conference Committee Involvement (1)

Nanoscale Quantum Optics

2 June 2014 |

Course Instructor

NON-SPIE: Optics and Photonics

BSc course at the Technical University of Denmark. I was course responsible in 2013, 2014, 2015, 2016, and 2017.

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NON-SPIE: Optical Properties of Solids

MSc course at the Technical University of Denmark. I was course responsible in 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, and 2017.

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