Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 30: Functional Materials: Performance, Reliability and Degradation; and Complex Materials (joint session MM/KFM)
MM 30.4: Vortrag
Donnerstag, 20. März 2025, 12:30–12:45, H23
Use of LiMn2O4 for switching applications in silicon waveguide circuits — •Vinit Agarwalla1, Yug Joshi2, and Guido Schmitz1 — 1Insitut für Materialwissenschaft, Universität Stuttgart, Heisenbergstr.3, 70569 Stuttgart — 2Max-Planck-Institut für Nachhaltige Materialien, Max-Planck-Straße 1, 40237, Düsseldorf
Lithium ion intercalation and deintercalation play an important role in determining the storage performance of cathode materials for lithium ion batteries. However, intercalation of ions also regularly modifies electron structure and optical properties of the materials. This study explores the possibility of exploiting the optical properties of the cathode material LiMn2O4 (LMO) for optical switching applications in silicon waveguide circuits. For this, LMO is coated as a cladding around Si waveguides suitable for the 1550 nm wavelength of optical telecommunication. To stabilize the interface a thin intermediate Si oxide film is tested as an optical transparent reaction barrier. Our TEM images and the EDX mapping show that the Si does not react with LMO for oxide layer thickness as low as 10 nm. Previous work has explored the change in resonance wavelength of reflectance spectra with lithiation/ delithiation in the visible region[1]. In extension, we have measured FTIR reflectance spectra in the near IR region. They show a fairly continuous spectrum between visible and IR region with reflectance going to 100 % and a gradual shift in resonance wavelength in the IR region with Li intercalation. The optical response on light transmission along the wave guides has been determined in dependence on the degree of lithiation. [1]. DOI:10.1002/adom.201701362
Keywords: LMO; intercalation; Optical; Waveguides