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Impact of Transforming Interface Geometry on Edge States in Valley Photonic Crystals

Yu, D. (author), Arora, S. (author), Kuipers, L. (author)

We investigate how altering the interface geometry from a zigzag to a glide plane interface between two topologically distinct valley Hall emulating photonic crystals (VPC), profoundly affects edge states. We experimentally observe a transition from gapless to gapped edge states, accompanied by the occurrence of slow light within the...

journal article 2024

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Observation of Landau levels and chiral edge states in photonic crystals through pseudomagnetic fields induced by synthetic strain

Barczyk, R.T. (author), Kuipers, L. (author), Verhagen, Ewold (author)

Control over light propagation and localization in photonic crystals offers wide applications ranging from sensing and on-chip routing to lasing and quantum light–matter interfaces. Although in electronic crystals, magnetic fields can be used to induce a multitude of unique phenomena, the uncharged nature of photons necessitates alternative...

journal article 2024

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Correction to: Highly-sensitive wafer-scale transfer-free graphene MEMS condenser microphones (Microsystems & Nanoengineering, (2024), 10, 1, (27), 10.1038/s41378-024-00656-x)

Pezone, R. (author), Anzinger, Sebastian (author), Baglioni, G. (author), Wasisto, Hutomo Suryo (author), Sarro, Pasqualina M (author), Steeneken, P.G. (author), Vollebregt, S. (author)

Correction to: Microsystems & Nanoengineering https://doi.org/10.1038/s41378-024-00656-x published online 21 February 2024 After publication of this article¹, it was brought to our attention that two pressure values were not correctly copied from the submitted original work to the published version. Correction 1 (from PDF, Page...

journal article 2024

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Single-electron charge transfer into putative Majorana and trivial modes in individual vortices

Ge, Jian Feng (author), Bastiaans, K.M. (author), Chatzopoulos, Damianos (author), Cho, Doohee (author), Tromp, Willem O. (author), Benschop, Tjerk (author), Niu, Jiasen (author), Gu, Genda (author), Allan, Milan P. (author)

Majorana bound states are putative collective excitations in solids that exhibit the self-conjugate property of Majorana fermions—they are their own antiparticles. In iron-based superconductors, zero-energy states in vortices have been reported as potential Majorana bound states, but the evidence remains controversial. Here, we use scanning...

journal article 2023

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Recent advances in metasurface design and quantum optics applications with machine learning, physics-informed neural networks, and topology optimization methods

Ji, W. (author), Chang, J. (author), Xu, He Xiu (author), Gao, J.R. (author), Groeblacher, S. (author), Urbach, Paul (author), Adam, A.J.L. (author)

As a two-dimensional planar material with low depth profile, a metasurface can generate non-classical phase distributions for the transmitted and reflected electromagnetic waves at its interface. Thus, it offers more flexibility to control the wave front. A traditional metasurface design process mainly adopts the forward prediction algorithm,...

review 2023

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Full Temporal Characterization of Ultrabroadband Few-Cycle Laser Pulses Using Atomically Thin WS₂

Hernandez-Rueda, Javier (author), Pérez-Benito, Óscar (author), Martínez Maestro, Laura (author), Noordam, M.L. (author), Kuipers, L. (author), Weigand, Rosa (author)

Nowadays, the accurate and full temporal characterization of ultrabroadband few-cycle laser pulses with pulse durations below 7 fs is of great importance in fields of science that investigate ultrafast dynamic processes. There are several indirect methods that use nonlinear optical signals to retrieve the complex electric field of femtosecond...

journal article 2023

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Silicon anisotropy in a bi-dimensional optomechanical cavity

Kersul, Cauê M. (author), Benevides, Rodrigo (author), Moraes, Flávio (author), de Aguiar, Gabriel H.M. (author), Wallucks, A. (author), Groeblacher, S. (author), Wiederhecker, Gustavo S. (author), Mayer Alegre, Thiago P. (author)

In this work, we study the effects of mechanical anisotropy in a 2D optomechanical crystal geometry. We fabricate and measure devices with different orientations, showing the dependence of the mechanical spectrum and the optomechanical coupling on the relative angle of the device to the crystallography directions of silicon. Our results show...

journal article 2023

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Normalization procedure for obtaining the local density of states from high-bias scanning tunneling spectroscopy

Rejali, R. (author), Farinacci, L.S.M. (author), Otte, A. F. (author)

Differential conductance spectroscopy performed in the high bias regime - in which the applied voltage exceeds the sample work function - is a suboptimal measure of the local density of states due to the effects of the changing tunnel barrier. Additionally, the large applied voltage oftentimes makes constant-height measurement experimentally...

journal article 2023

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Superconducting single-photon detectors get hot

Chang, J. (author), Esmaeil Zadeh, I.Z. (author)

journal article 2023

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Ultrafast Time Dynamics of Plasmonic Fractional Orbital Angular Momentum

Bauer, T.A. (author), Davis, Timothy J. (author), Frank, Bettina (author), Dreher, Pascal (author), Janoschka, David (author), Meiler, Tim C. (author), Meyer zu Heringdorf, Frank J. (author), Kuipers, L. (author), Giessen, Harald (author)

The creation and manipulation of optical vortices, both in free space and in two-dimensional systems such as surface plasmon polaritons (SPPs), has attracted widespread attention in nano-optics due to their robust topological structure. Coupled with strong spatial confinement in the case of SPPs, these plasmonic vortices and their underlying...

journal article 2023

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Non-classical mechanical states guided in a phononic waveguide

Zivari, A. (author), Stockill, R.H.J. (author), Fiaschi, N. (author), Groeblacher, S. (author)

The ability to create, manipulate and detect non-classical states of light has been key for many recent achievements in quantum physics and for developing quantum technologies. Achieving the same level of control over phonons, the quanta of vibrations, could have a similar impact, in particular on the fields of quantum sensing and quantum...

journal article 2022

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Compact amorphous-silicon visible-light monitor integrated in silicon nitride waveguides

De Vita, Christian (author), Klitis, Charalambos (author), Codreanu, N. (author), Ferrari, Giorgio (author), Sorel, Marc (author), Melloni, Andrea (author), Morichetti, Francesco (author)

This work reports on the realization of an amorphous silicon visible-light detector integrated in Si3N4 waveguides. The device is very compact (< 40 μm), has a responsivity of about 10 mA/W and a sensitivity of -40 dBm.

conference paper 2022

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Topological Protection in Radiative Photonic Crystal Cavities

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

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Electronic Properties and Phase Transition in the Kagome Metal Yb_0.5Co₃Ge₃

Wang, Y. (author), McCandless, Gregory T. (author), Wang, Xiaoping (author), Thanabalasingam, Kulatheepan (author), Wu, H. (author), Bouwmeester, D. (author), van der Zant, H.S.J. (author), Ali, M.N. (author), Chan, C.L. (author)

The Kagome lattice is an important fundamental structure in condensed matter physics for investigating the interplay of electron correlation, topology, and frustrated magnetism. Recent work on Kagome metals in the AV3Sb5 (A = K, Rb, and Cs) family has shown a multitude of correlation-driven distortions, including symmetry breaking charge...

journal article 2022

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Ultra-high system detection efficiency superconducting nanowire single-photon detectors for quantum photonics and life sciences

Lopez Rodriguez, B. (author), Chang, J. (author), Los, Johannes W.N. (author), Steinhauer, Stephan (author), Zwiller, Val (author), Esmaeil Zadeh, I.Z. (author)

Ultra-high system detection efficiency (SDE) s uperconducting nanowire single-photon detectors are demonstrated for a broad range of wavelengths, from UV to mid-infrared, opening novel possibilities in the fields of quantum photonics, neuroimaging and astronomy.

conference paper 2022

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Revealing the nanogeometry of WS2 nanoflowersby polarization-resolved Raman spectroscopy

Komen, I. (author), van Heijst, S.E. (author), Caldarola, M. (author), Conesa Boj, S. (author), Kuipers, L. (author)

Recent studies of transition metal dichalcogenides (TMDs) have revealed exciting optical properties, such as stable excitons and chiral light–matter interactions. Chemical vapor deposition techniques provide a platform for the fabrication of nanostructures with diverse geometries, ranging from horizontal flakes to flower-like structures. Raman...

journal article 2022

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Simultaneous Characterization of Two Ultrashort Optical Pulses at Different Frequencies Using a WS₂Monolayer

Noordam, Marcus L. (author), Hernandez Rueda, F.J. (author), Kuipers, L. (author)

The precise characterization of ultrashort laser pulses has been of interest to the scientific community for many years. Frequency-resolved optical gating (FROG) has been extensively used to retrieve the temporal and spectral field distributions of ultrashort laser pulses. In this work, we exploit the high, broad-band nonlinear optical...

journal article 2022

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On-chip distribution of quantum information using traveling phonons

Zivari, A. (author), Fiaschi, N. (author), Burgwal, Roel (author), Verhagen, Ewold (author), Stockill, Robert (author), Groeblacher, S. (author)

Distributing quantum entanglement on a chip is a crucial step toward realizing scalable quantum processors. Using traveling phonons-quantized guided mechanical wave packets-as a medium to transmit quantum states is now gaining substantial attention due to their small size and low propagation speed compared to other carriers, such as electrons...

journal article 2022

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Cloaked near-field probe for non-invasive near-field optical microscopy

Bernal Arango, F.A. (author), Alpeggiani, F. (author), Conteduca, Donato (author), Opheij, A. (author), Chen, Aobo (author), Abdelrahman, Mohamed I. (author), Krauss, Thomas F. (author), Alù, Andrea (author), Kuipers, L. (author)

Near-field scanning optical microscopy is a powerful technique for imaging below the diffraction limit, which has been extensively used in biomedical imaging and nanophotonics. However, when the electromagnetic fields under measurement are strongly confined, they can be heavily perturbed by the presence of the near-field probe itself. Here,...

journal article 2022

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Breakdown of Spin-to-Helicity Locking at the Nanoscale in Topological Photonic Crystal Edge States

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