Monolithic thin-film lithium niobate broadband spectrometer with one nanometre resolution

Giovanni Finco (), Gaoyuan Li, David Pohl, Marc Reig Escalé, Andreas Maeder, Fabian Kaufmann and Rachel Grange
Additional contact information
Giovanni Finco: Optical Nanomaterial Group
Gaoyuan Li: Optical Nanomaterial Group
David Pohl: Optical Nanomaterial Group
Marc Reig Escalé: Optical Nanomaterial Group
Andreas Maeder: Optical Nanomaterial Group
Fabian Kaufmann: Optical Nanomaterial Group
Rachel Grange: Optical Nanomaterial Group

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Miniaturised optical spectrometers are attractive due to their small footprint, low weight, robustness and stability even in harsh environments such as space or industrial facilities. We report on a stationary-wave integrated Fourier-transform spectrometer featuring a measured optical bandwidth of 325 nm and a theoretical spectral resolution of 1.2 nm. We fabricate and test on lithium niobate-on-insulator to take full advantage of the platform, namely electro-optic modulation, broad transparency range and the low optical loss achieved thanks to matured fabrication techniques. We use the electro-optic effect and develop innovative layouts to overcome the undersampling limitations and improve the spectral resolution, thus providing a framework to enhance the performance of all devices sharing the same working principle. With our work, we add another important element to the portfolio of integrated lithium-niobate optical devices as our spectrometer can be combined with multiple other building blocks to realise functional, monolithic and compact photonic integrated circuits.

Date: 2024
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DOI: 10.1038/s41467-024-46512-4

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