Bioinspired Nanophotonic Angle-Independent and Ultralarge Light Dispersion Allowing Simultaneous Near-Infrared-Spectroscopy and Visible-Imaging
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1.
California Institute of Technology
Abstract
High-performance optical spectroscopy integrated into hand-held platforms, especially smartphones, is vital for numerous consumer applications. However, optical spectrometers pose a challenge for miniaturization due to the fundamental limitations of small- and angle-dependent light dispersion. We introduce a new bioinspired light dispersion technology combining disordered scattering nanostructures with ordered Bragg resonances to achieve an ultralarge and angle-independent dispersion. We demonstrate an ultracompact spectrometer using the bioinspired dispersive element enabling simultaneous wide-angle visible imaging and near-infrared spectroscopy on a single conventional complementary metal-oxide-semiconductor image sensor. This approach reduces dispersion-based spectrometer device thickness or total track length below 5 mm with an angular tolerance of 30°, sub-5 nm spectral resolution, and 200 nm bandwidth, enabling hand-held and smartphone-integrated spectroscopy and opening up a new way to achieve high-performance mobile sensing and detection.
Copyright and License
Acknowledgement
We gratefully acknowledge critical support and infrastructure provided for this work by the Kavli Nanoscience Institute at Caltech and Samsung Advanced Institute of Technology. We thank Haeri Park for fruitful discussion on the BioDE simulation and Vinayak Narasimhan and Shailabh Kumar for their help with the biosensing experiment.
Funding
This work was supported by Samsung Electronics. The research was partially funded by a Samsung Global Research Outreach program at Caltech. Y.P. acknowledges the support by the Ministry of Science and ICT under the National R&D Program (NRF-2021R1F1A1062182) and also by the Ministry of Education under the Basic Science Research Program (NRF-2020R1A6A1A03047771); the both programs were funded through the National Research Foundation of Korea (NRF).
Contributions
D.A. and R.H.S. conceived the idea, designed the analyses, and equally contributed to the study. D.A. ran the simulations and developed the numerical models. D.A. and R.H.S. performed the experiments. H. K. and Y.P. fabricated the BioDE. U-J. K. assisted in the assembly of the smartphone spectrometer. R.H.S., D.A., and H.C wrote the manuscript. All authors discussed the results and commented on the manuscript. D.A. and R.H.S. contributed equally to this work.
Data Availability
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Design optimization and simulations, fabrication, device characterization and performance testing and review, and device assembly and application (PDF)
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Video depicting dispersion of each BioDE characterized on a benchtop setup (AVI)
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Video of the BioDE array’s performance as a spectrometer verified through measuring the spectrum (MP4)
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Video of a hand-held camera detecting the NIR spectral streaks from the biosensor (MP4)
Conflict of Interest
The authors declare the following competing financial interest(s): The invention described in this report was the subject of two patent filings by Samsung and Caltech (USA Patent Applications no. 16/914,254 and 16/914,256). Inventors are R.H.S., D.A., H.C. and H. K. The remaining authors (Y.P., U-J.K., Y-G. R, M.W.) have no conflict of interest.
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Additional details
- ISSN
- 2330-4022
- Samsung (United States)
- National Research Foundation of Korea
- NRF- 2020R1A6A1A03047771
- National Research Foundation of Korea
- NRF-2021R1F1A1062182
- Caltech groups
- Kavli Nanoscience Institute