On-chip twisted hollow-core light cages: enhancing planar photonics with 3D nanoprinting

• DOI: 10.48550/arxiv.2409.07602
• Publication Date: 2024-09-11
• Authors: Johannes Bürger; Jisoo Kim; Thomas Weiß; Stefan A. Maier; Markus A. Schmidt
• Keywords: FOS: Physical sciences; Physics - Optics; Optics (physics.optics)

Twisted optical fibers are a promising platform for manipulating circularly polarized light and orbital angular momentum beams applications such as nonlinear frequency conversion, communication, or chiral sensing. However, integration into chip-scale technology is challenging because twisted incompatible with planar photonics the achieved twist rates limited. Here, we address these challenges by introducing concept of 3D-nanoprinted on-chip hollow-core cages. We show theoretically experimentally that geometrical twisting cages forces fundamental core mode given handedness to couple selected higher-order modes, resulting in strong circular dichroism (CD). These resonances result from harmonics mode, allowing us predict their spectral locations occurrence birefringence. enable very high CD, exceeding those more than two orders magnitude (twist period: 90 $\mu$m, CD: 0.8 dB/mm). Moreover, unique cage design provides lateral access central region, enabling future spectroscopy. Therefore, presented opens path translating fiber research technology, new integrated photonics.