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. 2024 Jan 10;15:436. doi: 10.1038/s41467-023-44518-y

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Microscope images of the fabricated a photonic chip, b tunable Fourier-transform spectrometer, c spatial heterodyne spectrometer, and d inverse-taper edge couplers. e Measured transmittance (|t|²) cube. The cube is sliced into the matrices with varying heating power (P), represented by the colors of dots in the upper right corner. Each matrix contains transmittances with varying arm-length differences (ΔL_SHS) and wavelengths (λ).