Deterministic Fabrication of Fluorescent Nanostructures Featuring Distinct Optical Transitions
Year of publicationPublished in:Nanomaterials
M. Rikers, A. Bashiri, G. Angela, M. Steinert, D. Choi, T. Pertsch, I. Staude
The precise and deterministic integration of fluorescent emitters with photonic nanostructures is an important challenge in nanophotonics and key to the realization of hybrid photonic systems, supporting effects such as emission enhancement, directional emission, and strong coupling. Such integration typically requires the definition or immobilization of the emitters at defined positions with nanoscale precision. While various methods were already developed for creating localized emitters, in this work we present a new method for the deterministic fabrication of fluorescent nanostructures featuring well-defined optical transitions; it works with a minimal amount of steps and is scalable. Specifically, electron-beam lithography is used to directly pattern a mixture of the negative-tone electron-beam resist with the europium complex Eu(TTA)₃, which exhibits both electric and magnetic dipolar transitions. Crucially, the lithography process enables precise control over the shape and position of the resulting fluorescent structures with a feature size of approx. 100 (Formula presented.) (Formula presented.). We demonstrate that the Eu(TTA)₃ remains fluorescent after exposure, confirming that the electron beam does not alter the structure the optical transitions. This work supports the experimental study of local density of optical states in nanophotonics. It also expands the knowledge base of fluorescent polymer materials, which can have applications in polymer-based photonic devices. Altogether, the presented fabrication method opens the door for the realization of hybrid nanophotonic systems incorporating fluorescent emitters for light-emitting dielectric metasurfaces.
Femtosecond Pulse Shaping with Semiconductor Huygens' Metasurfaces
Year of publicationPublished in:Advanced Optical Materials
K. Tanaka, D. Arslan, M. Weissflog, N. Geib, K. Gerold, A. Szeghalmi, M. Ziegler, F. Eilenberger, T. Pertsch, R. Schiek, I. Staude
Angle-Tolerant Circular Eigenpolarizations Enabled by Orientational Disorder in Dielectric Metasurfaces
Year of publicationPublished in:Advanced Optical Materials
K. Tanaka, A. Rahimzadegan, D. Arslan, A. Fitriana, S. Fasold, D. Pidgayko, M. Steinert, T. Pertsch, M. Decker, C. Rockstuhl, I. Staude
Tailored structural disorder in photonic metasurfaces enables advanced light shaping. Specifically, an orientational disorder in chiral nanostructures leads to circular eigenpolarizations with a heavily suppressed linear birefringence. The orientational disorder is, therefore, vital to observing purely chiroptical effects such as circular dichroism and optical activity. Here, it is experimentally and numerically demonstrated that all-dielectric orientationally disordered chiral bilayer square array metasurfaces preserve highly circular eigenpolarizations for a wide range of incidence angles. The angle-dependent performance of disordered chiral metasurfaces is compared with that of their C₂ and C₄ symmetric periodic counterparts, demonstrating that the disordered structures provide nearly pure circular eigenpolarizations across a larger range of angles and wavelengths, whereas the periodic ones do not. These findings underscore the ability of tailored disorder to enhance the robustness of engineered chiroptical responses of all-dielectric metasurfaces and highlight its potential for flat, integrable, and highly efficient optical components, such as circular polarizers and beam splitters.
Angle-Tolerant Circular Eigenpolarizations Enabled by Orientational Disorder in Dielectric Metasurfaces
Year of publicationPublished in:Advanced Optical Materials
K. Tanaka, A. Rahimzadegan, D. Arslan, A. Fitriana, S. Fasold, D. Pidgayko, M. Steinert, T. Pertsch, M. Decker, C. Rockstuhl, I. Staude
Tailored structural disorder in photonic metasurfaces enables advanced light shaping. Specifically, an orientational disorder in chiral nanostructures leads to circular eigenpolarizations with a heavily suppressed linear birefringence. The orientational disorder is, therefore, vital to observing purely chiroptical effects such as circular dichroism and optical activity. Here, it is experimentally and numerically demonstrated that all-dielectric orientationally disordered chiral bilayer square array metasurfaces preserve highly circular eigenpolarizations for a wide range of incidence angles. The angle-dependent performance of disordered chiral metasurfaces is compared with that of their C₂ and C₄ symmetric periodic counterparts, demonstrating that the disordered structures provide nearly pure circular eigenpolarizations across a larger range of angles and wavelengths, whereas the periodic ones do not. These findings underscore the ability of tailored disorder to enhance the robustness of engineered chiroptical responses of all-dielectric metasurfaces and highlight its potential for flat, integrable, and highly efficient optical components, such as circular polarizers and beam splitters.
Fabrication of low-loss lithium niobate on insulator waveguides on the wafer scale [Invited]
Year of publicationPublished in:Optical Materials Express
M. Younesi, T. Kasebier, I. Elmanov, Y. Li, P. Kumar, R. Geiss, T. Siefke, F. Eilenberger, F. Setzpfandt, U. Zeitner, T. Pertsch
We report on the wafer scale fabrication of single-mode low-loss lithium niobate on insulator waveguides utilizing a chemically amplified resist and an optimized dry etching method. The fabricated single-mode waveguides are free of residuals and re-deposition, with measured losses for straight waveguides around 2 dB/m (0.02 dB/cm). We present a method offering advantages for large-scale production mainly due to its cost-effectiveness and faster writing time. This work holds promise for advancing integrated photonics and optical communication technologies.
Enhanced Exciton-Plasmon Interaction Enabling Observation of Near-Field Photoluminescence in a WSe₂-Gold Nanoparticle Hybrid System
Year of publicationPublished in:ACS Photonics
A. Romashkina, S. Sushil, A. Barreda, Z. Fedorova, F. Abtahi, N. Doolaard, Z. Zhang, C. Helgert, I. Staude, F. Eilenberger, T. Pertsch, B. Tugchin
Monolayer transition metal dichalcogenides, such as tungsten diselenide, have recently attracted considerable attention due to their reduced dielectric screening and direct bandgap, which result in high exciton binding energy and strong photoluminescence. The integration of monolayer transition metal dichalcogenides with plasmonic nanoparticles enhances their optoelectronic properties through localized surface plasmons and strong electromagnetic confinement. We investigated the photoluminescence response of the hybrid system of monolayer tungsten diselenide and gold nanoparticle arrays through near-field mapping. Our study demonstrated a significant enhancement of the excitonic emission by the excited gold nanoparticles via near-field interaction. We examined the impact of exciton-plasmon-polariton coupling on the far-field response of the hybrid system. There, we observed the phenomenon of exciton-induced transparency, which indicates the intermediate coupling regime and helps resonantly enhance the light-matter interaction in monolayer tungsten diselenide. The second harmonic generation intensity from the hybrid system was shown to follow the linear spectral response of the hybrid system, thereby demonstrating the enhanced coupling between surface plasmons and excitons. Our research offers insights into the impact of intermediate coupling on the optical properties of hybrid exciton-plasmon systems, which is crucial for the development of advanced nanophotonic devices.
Year of publicationStatusReview pendingPublished in:Optical Fiber Communication Conference in Proceedings Optical Fiber Communication Conference, OFC 2025 and Optical Fiber Communication Conference (OFC) Postdeadline Papers 2025
J. Schmid, P. Cheben, J. Zhang, R. Korček, M. Saad-Bin-Alam, R. Cheriton, S. Janz, D. Xu, S. Wang, M. Vachon, R. Ma, R. Halir, G. Wangüemert-Pérez, A. Ortega-Moñux, I. Molina Fernandez, A. Sánchez-Postigo, J. Luque-González, A. Hinestrosa, D. Melati, Z. Mokeddem, C. Alonso-Ramos, L. Vivien, W. Ye, S. Khajavi, W. Fraser, D. Benedikovic, Y. Sırmacı, I. Staude, T. Pertsch, C. Naraine, J. Bradley, A. Knights, T. Dominguez Bucio, F. Gardes
Combining Computational Spectroscopy and Dipole Modeling for Morphology Optimization of Metastructures in Photonic Applications
Year of publicationStatusReview pendingPublished in:Clinical and Translational Biophotonics, Translational 2025 in Proceedings Optica Biophotonics Congress 2025, Part of Optica Biophotonics Congress: Optics in the Life Sciences
I. Riabenko, T. Pertsch
Combining Computational Spectroscopy and Dipole Modeling for Morphology Optimization of Metastructures in Photonic Applications
Year of publicationStatusReview pendingPublished in:Optical Manipulation and Its Applications, OMA 2025 in Proceedings Optica Biophotonics Congress 2025 - Part of Optica Biophotonics Congress: Optics in the Life Sciences
I. Riabenko, T. Pertsch
Combining Computational Spectroscopy and Dipole Modeling for Morphology Optimization of Metastructures in Photonic Applications
Year of publicationStatusReview pendingPublished in:Bio-Optics: Design and Application, BODA 2025 in Proceedings Optica Biophotonics Congress 2025, Part of Optica Biophotonics Congress: Optics in the Life Sciences
I. Riabenko, T. Pertsch
Combining Computational Spectroscopy and Dipole Modeling for Morphology Optimization of Metastructures in Photonic Applications
Year of publicationStatusReview pendingPublished in:Optical Molecular Probes, Imaging and Drug Delivery, OMP 2025 in Proceedings Optica Biophotonics Congress 2025 - Part of Optica Biophotonics Congress: Optics in the Life Sciences
I. Riabenko, T. Pertsch