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22 results on '"Goßler, Christian"'

4. Angle‐dependent light scattering in tissue phantoms for the case of thin bone layers with predominant forward scattering.

Author

Witke, Tom, Kuhn, Eduard, Teichert, Fabian, Goßler, Christian, Schwarz, Ulrich Theodor, and Thränhardt, Angela

Abstract

The cochlea forms a key element of the human auditory system in the temporal bone. Damage to the cochlea continues to produce significant impairment for sensory reception of environmental stimuli. To improve this impairment, the optical cochlear implant forms a new research approach. A prerequisite for this method is to understand how light propagation, as well as scattering, reflection, and absorption, takes place within the cochlea. We offer a method to study the light distribution in the human cochlea through phantom materials which have the objective to mimic the optical behavior of bone and Monte‐Carlo simulations. The calculation of an angular distribution after scattering requires a phase function. Often approximate functions like Henyey–Greenstein, two‐term Henyey–Greenstein or Legendre polynomial decompositions are used as phase function. An alternative is to exactly calculate a Mie distribution for each scattering event. This method provides a better fit to the data measured in this work. [ABSTRACT FROM AUTHOR]

Published
2024
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5. On the Fabrication and Characterization of Polymer-Based Waveguide Probes for Use in Future Optical Cochlear Implants

Author

Helke, Christian, primary, Reinhardt, Markus, additional, Arnold, Markus, additional, Schwenzer, Falk, additional, Haase, Micha, additional, Wachs, Matthias, additional, Goßler, Christian, additional, Götz, Jonathan, additional, Keppeler, Daniel, additional, Wolf, Bettina, additional, Schaeper, Jannis, additional, Salditt, Tim, additional, Moser, Tobias, additional, Schwarz, Ulrich Theodor, additional, and Reuter, Danny, additional

Published
2022
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6. On the Fabrication and Characterization of Polymer-Based Waveguide Probes for Use in Future Optical Cochlear Implants.

Author

Helke, Christian, Reinhardt, Markus, Arnold, Markus, Schwenzer, Falk, Haase, Micha, Wachs, Matthias, Goßler, Christian, Götz, Jonathan, Keppeler, Daniel, Wolf, Bettina, Schaeper, Jannis, Salditt, Tim, Moser, Tobias, Schwarz, Ulrich Theodor, and Reuter, Danny

Subjects
COCHLEAR implants, SPIRAL ganglion, SCANNING electron microscopes, SCANNING electron microscopy, LIGHT intensity, OPTICAL microscopes, SEMICONDUCTOR lasers, SEMICONDUCTOR manufacturing, WAVEGUIDES
Abstract

Improved hearing restoration by cochlear implants (CI) is expected by optical cochlear implants (oCI) exciting optogenetically modified spiral ganglion neurons (SGNs) via an optical pulse generated outside the cochlea. The pulse is guided to the SGNs inside the cochlea via flexible polymer-based waveguide probes. The fabrication of these waveguide probes is realized by using 6" wafer-level micromachining processes, including lithography processes such as spin-coating cladding layers and a waveguide layer in between and etch processes for structuring the waveguide layer. Further adhesion layers and metal layers for laser diode (LD) bonding and light-outcoupling structures are also integrated in this waveguide process flow. Optical microscope and SEM images revealed that the majority of the waveguides are sufficiently smooth to guide light with low intensity loss. By coupling light into the waveguides and detecting the outcoupled light from the waveguide, we distinguished intensity losses caused by bending the waveguide and outcoupling. The probes were used in first modules called single-beam guides (SBGs) based on a waveguide probe, a ball lens and an LD. Finally, these SBGs were tested in animal models for proof-of-concept implantation experiments. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Hearing the Light

Author

Moser, Tobias, primary, Keppeler, Daniel, additional, Goßler, Christian, additional, and Schwarz, Ulrich T., additional

Published
2021
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15. GaN-based micro-LED arrays on flexible substrates for optical cochlear implants

Author

Goßler, Christian, primary, Bierbrauer, Colin, additional, Moser, Rüdiger, additional, Kunzer, Michael, additional, Holc, Katarzyna, additional, Pletschen, Wilfried, additional, Köhler, Klaus, additional, Wagner, Joachim, additional, Schwaerzle, Michael, additional, Ruther, Patrick, additional, Paul, Oliver, additional, Neef, Jakob, additional, Keppeler, Daniel, additional, Hoch, Gerhard, additional, Moser, Tobias, additional, and Schwarz, Ulrich T, additional

Published
2014
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