20.500.12556/RUL-173333 Origins and mitigation of scattering-related propagation losses in suspended GaAs waveguides for quantum photonic integrated circuits Quantum photonic integrated circuits (QPICs) offer a promising path toward scalable quantum technologies. QPICs rely on the integration of many quantum photonic components and interconnecting optical waveguides for generation, manipulation, and detection of single photons. A key challenge in QPICs is the management and minimization of optical losses, which is particularly critical for single-photon applications. In this paper, we investigate optical propagation losses in strip waveguides within suspended gallium arsenide (GaAs) platforms, which can directly host deterministic single-photon sources but suffer high scattering-related losses. We systematically analyze different scattering loss contributions by investigating four key waveguide perturbation types: sidewall roughness, top surface roughness, surface particles, and suspension tethers. Our approach combines rigorous 3D finite-difference time-domain (FDTD) simulations with experimental measurements to decouple and quantify individual contributions to the total propagation loss. We study two suspended GaAs platforms operating at different wavelengths: an established 930 nm platform and an emerging 1300 nm platform in the telecommunication O-band. Based on our findings, we identify the dominant scattering loss mechanisms and propose novel design-time guidelines and concrete strategies to reduce the main loss contributions by factors of 2.5–5. These improvements are crucial for enabling complex QPICs directly within the native platform of the single-photon source, supporting advances in integrated quantum technologies. optical propagation losses optical scattering quantum photonic integrated circuits QPICs suspended gallium arsenide GaAs strip waveguides waveguide sidewall roughness waveguide surface roughness waveguide surface particles waveguide suspension tethers optical waveguides surface waves surface roughness rough surfaces gallium arsenide propagation losses scattering optical surface waves surface treatment optical losses optične izgube širjenja optično sipanje kvantna fotonska integrirana vezja viseči trakasti valovodi iz galijevega arzenida GaAs hrapavost stranic valovoda hrapavost površine valovoda delci na površini valovoda nosilni mostiči valovoda true false true Angleški jezik Slovenski jezik Članek v reviji 2025-09-16 08:53:51 2025-09-16 08:53:57 2026-01-27 13:46:22 0000-00-00 00:00:00 2025 0 0 13 str. no. 5, art. 6100413 Vol. 31 Sep./Oct. 2025 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 0000-00-00 621.38 1558-4542 10.1109/JSTQE.2025.3576388 249046531 Origins_and_Mitigation_of_Scattering-Related_Propagation_Losses_in_Suspended_GaAs_Waveguides_for_Quantum_Photonic_Integrated_Circuits.pdf Origins_and_Mitigation_of_Scattering-Related_Propagation_Losses_in_Suspended_GaAs_Waveguides_for_Quantum_Photonic_Integrated_Circuits.pdf 1 E786A1F9593F68C185F71ADA00D16AB8 d3511e274fe02c0ed155bf13d202276ad3c0841f8449d7364cba8973c1a09588 25cd41d2-92ca-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=217676 https://ieeexplore.ieee.org/document/11023197 1 bf9ef7a5-92c9-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=217675 Fakulteta za elektrotehniko 0 0 0