Publicaties
Gekozen filters:
Gekozen filters:
Design and Analysis of Resonant Metamaterials for Acoustic Insulation(Ontwerp en analyse van resonante metamaterialen voor geluidsisolatie) KU Leuven
Increasing customer expectations and more restrictive legal requirements turn the acoustical behaviour of products into an important design criterion in the machine and transportation industry as well as in the construction and consumer goods sector. Ecological trends and the associatedrun for efficiency, however, increased the importance of lightweight design and reduced the applicability of classical (heavy) solutions to improve acoustic ...
Optical analogue of the Robertson-Walker metric: Frequency conversion inside linear time-dependent metamaterials Vrije Universiteit Brussel
In this contribution, we apply the framework of transformation optics to the Robertson-Walker metric of general relativity. We describe how a medium with controlled time-dependent material properties can change the optical frequency, even though it supports linear electromagnetic waves, and we demonstrate perfect redshifting or blueshifting of an electromagnetic wave without creation of
sidebands.
sidebands.
Optical forces in metamaterials Vrije Universiteit Brussel
Since a few years, it has been proposed to harness optical forces, i.e., the forces that arise when linear momentum is transferred from photons to matter, in micro- and nanophotonic systems. Most attention was focused on optical forces in waveguides, where resonant waveguide modes enable forces on the space scale of the wavelength of light. Recently, we have extended such research to subwavelength structures. We start this communication with a ...
Understanding and reducing losses in metamaterials Vrije Universiteit Brussel
In the last decade, a new area of photonics research has emerged, that has given the ability to produce materials with entirely novel electromagnetic properties. These new materials are known as "metamaterials" for their ability to take beyond conventional materials. Clearly, the field of metamaterials can develop mould-breaking technologies for a plethora of applications, where control over light (or more generally electromagnetic radiation) is ...
Amplifying optical gradient forces with metamaterials Vrije Universiteit Brussel
We demonstrate how transformation optics can be used to amplify optical gradient forces. We show how meta-materials allow to enhance optical forces between waveguides over several orders of magnitude, even when realistic losses are included.
Spacetime Metamaterials Perspectives KU Leuven
Optical pulse frequency conversion inside transformation-optical metamaterials Vrije Universiteit Brussel
Based on the analogy between the Maxwell equations in complex metamaterials and the free-space Maxwell equations on the background of an arbitrary metric, transformation optics allows for the design of metamaterial devices using a geometrical perspective. This intuitive geometrical approach has already generated various novel applications within the fields of invisibility cloaking, electromagnetic beam manipulation, optical information storage, ...
Graphene in metamaterials: What makes a material a good conductor? Vrije Universiteit Brussel
Recent developments in the field of metamaterials--or engineered materials with novel electromagnetic properties--have promised a number of exciting applications, in particular at optical frequencies. Most metamaterials consist of carefully designed metallic structures that replace atoms in their role as the basic units of interaction with electromagnetic radiation. Unfortunately, the noble metals are not particularly good conductors at optical ...
Metamaterials enhancing optical forces Vrije Universiteit Brussel
The interaction between light and matter involves not only an energy transfer, but also the transfer of linear momentum. In everyday life applications this linear momentum of light is too small to play any significant role. However, in nanoscale dimensions, the associated optical forces start to play an increasingly important role. These forces are, e.g., large enough for exiting experiments in the fields of cavity-optomechanics, laser ...