Searched for: +
(1 - 9 of 9)
document
Barczyk, R.T. (author), Parappurath, Nikhil (author), Arora, S. (author), Bauer, T.A. (author), Kuipers, L. (author), Verhagen, Ewold (author)
The introduction of topological concepts to the design of photonic crystal cavities holds great promise for applications in integrated photonics due to the prospect of topological protection. This study examines the signatures of topological light confinement in the leakage radiation of 2D topological photonic crystal cavities. The cavities are...
journal article 2022
document
Arora, S. (author), Bauer, T.A. (author), Parappurath, N. (author), Barczyk, R.T. (author), Verhagen, E. (author), Kuipers, L. (author)
We measure the local near-field spin in topological edge state waveguides that emulate the quantum spin Hall effect. We reveal a highly structured spin density distribution that is not linked to a unique pseudospin value. From experimental near-field real-space maps and numerical calculations, we confirm that this local structure is essential...
journal article 2022
document
Barczyk, R.T. (author), Parappurath, N. (author), Arora, S. (author), Bauer, T.A. (author), Kuipers, L. (author), Verhagen, E. (author)
We study the signatures of topological light confinement in the leakage radiation of two-dimensional topological photonic crystal cavities that feature the quantum spin Hall effect at telecom wavelengths. The mode profiles in real and momentum space are retrieved using far field imaging and Fourier spectropolarimetry. We examine the scaling...
conference paper 2022
document
Arora, S. (author), Bauer, T.A. (author), Barczyk, René (author), Verhagen, Ewold (author), Kuipers, L. (author)
Topological on-chip photonics based on tailored photonic crystals (PhCs) that emulate quantum valley-Hall effects has recently gained widespread interest owing to its promise of robust unidirectional transport of classical and quantum information. We present a direct quantitative evaluation of topological photonic edge eigenstates and their...
journal article 2021
document
Parappurath, Nikhil (author), Alpeggiani, F. (author), Kuipers, L. (author), Verhagen, Ewold (author)
Topological protection in photonics offers new prospects for guiding and manipulating classical and quantum information. The mechanism of spin-orbit coupling promises the emergence of edge states that are helical, exhibiting unidirectional propagation that is topologically protected against back scattering. We directly observe the topological...
journal article 2020
document
Alpeggiani, F. (author), Parappurath, N. (author), Verhagen, Ewold (author), Kuipers, L. (author)
The scattering matrix is a fundamental tool to quantitatively describe the properties of resonant systems. In particular, it enables the understanding of many photonic devices of current interest, such as photonic metasurfaces and nanostructured optical scatterers. In this contribution, we show that the scattering matrix of a photonic system...
conference paper 2017
document
Parappurath, N. (author), Alpeggiani, F. (author), Kuipers, L. (author), Verhagen, Ewold (author)
We observe that the asymmetric transmission (AT) through photonic systems with a resonant chiral response is strongly related to the far-field properties of eigenmodes of the system. This understanding can be used to predict the AT for any resonant system from its complex eigenmodes. We find that the resonant chiral phenomenon of AT is...
journal article 2017
document
Parappurath, N. (author), Alpeggiani, F. (author), Kuipers, L. (author), Verhagen, E. (author)
We develop a theoretical formalism which explains asymmetric transmission (AT) in chiral resonators from their eigenmodes. We derive a fundamental limit for AT and propose the design of a chiral photonic crystal offering 84% AT.
conference paper 2017
document
Alpeggiani, F. (author), Parappurath, N. (author), Verhagen, E. (author), Kuipers, L. (author)
It is well known that the quasinormal modes (or resonant states) of photonic structures can be associated with the poles of the scattering matrix of the system in the complex-frequency plane. In this work, the inverse problem, i.e., the reconstruction of the scattering matrix from the knowledge of the quasinormal modes, is addressed. We develop...
journal article 2017
Searched for: +
(1 - 9 of 9)