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- W4372291573 abstract "We present a systematic investigation of an SiO 2 etching process using a standard fluorocarbon chemistry ICP-RIE etch tool with a cryogenically cooled electrode. Our goal is to enable the control of the SiO 2 feature morphology, i.e., the sidewall angle, in order to add a degree of freedom for the design of resonant micro-/nanooptical elements. For such elements as e.g., whispering gallery mode resonators with specific mode profiles, it is essential to maintain low surface roughness. To this end, we investigate a variety of gas compositions. For statistical evaluation, we use a surface response methodology for several parameters and investigate the influence of the substrate temperature on the sidewall angle. Different hypotheses from the literature for the cause of non-anisotropic etch behavior are discussed for our specific case. Various investigations based on the prior hypothesis are presented, which provide more information about the pseudo-isotropic etch profile. Finally, we present two use cases: firstly, a classical anisotropic etch with a high aspect ratio and very low roughness (<1 nm), and secondly, an etch process for the fabrication of whispering gallery mode resonators that confine the light at the bottom of the resonator." @default.
- W4372291573 created "2023-05-07" @default.
- W4372291573 creator A5039808453 @default.
- W4372291573 creator A5083649362 @default.
- W4372291573 date "2023-05-31" @default.
- W4372291573 modified "2023-10-18" @default.
- W4372291573 title "2.5D+ plasma etching for a continuously adjustable sidewall angle in SiO<sub>2</sub>" @default.
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- W4372291573 doi "https://doi.org/10.1364/ome.484157" @default.
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