arXiv subjects

Marko Perestjuk

Publications and source records attributed to Marko Perestjuk.

2 recordsLinked to original sources

arXiv2024

One Million Quality Factor Integrated Ring Resonators in the Mid-Infrared

We report ring resonators on a silicon germanium on silicon platform operating in the mid-infrared wavelength range around 3.5 - 4.6 {\mu}m with quality factors reaching up to one million. Advances in fabrication technology enable us to demonstrate such high Q-factors, which put silicon germanium at the forefront of mid-infrared integrated photonic platforms. The achievement of high Q is attested by the observation of degeneracy lifting between clockwise (CW) and counter-clockwise (CCW) resonances, as well as optical bistability due to an efficient power buildup in the rings.

physics.optics↗

arXiv2024

The Behavior of the Intercalant AlCl_4 Anion during the Formation of Graphite Intercalation Compound: An X-ray Absorption Fine Structure Study

This work aims to study the insertion of AlCl_4^- anion in the crystalline structure of oriented pyrolytic graphite (PG) at the point of view of the anion itself. The electronic and atomic structures of the anion at different intercalation stages are studied. In particular double-edge (bicolor) X-ray absorption spectroscopy at the Al and Cl K-edges is carried out, highlighting a contraction of the anion bonding at the highest intercalation degree obtained electrochemically (stage 3), while the electronic population changes for both the edges upon cycle.

cond-mat.mtrl-sci↗