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Lensless Fluorescent Microscopy on a Chip
Published on: August 17, 2011
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Active metasurface designs for lensless and detector-limited imaging
Julie Belleville1, Prachi Thureja1, Harry A Atwater1
1Thomas J. Watson Laboratories of Applied Physics, California Institute of Technology, Pasadena, CA 91125, USA.
Nanophotonics (Berlin, Germany)
|November 17, 2025
Summary
Active metasurfaces enable compact imaging systems by acting as tunable apertures. A novel perimeter-control architecture allows efficient image collection with fewer control signals, overcoming limitations of passive systems.
Area of Science:
- Optics and Photonics
- Metasurface Technology
- Computational Imaging
Background:
- Metasurfaces offer compact imaging capabilities, surpassing traditional optics.
- Passive metasurface systems face fundamental information and thickness limitations.
- Active metasurfaces present a new paradigm for advanced imaging.
Purpose of the Study:
- To explore active metasurfaces for low form-factor, low pixel-count imaging systems.
- To introduce a lensless imaging concept using an active metasurface aperture.
- To analyze the scalability and fundamental limits of active metasurface imaging platforms.
Main Methods:
- Concept development of a lensless imaging system with an active metasurface.
- Computational demonstration of a 'perimeter-control' addressing architecture.
- Analysis of scalability, information limits, aberrations, and signal-to-noise ratio.
Main Results:
- A scalable 'perimeter-control' architecture (M+N voltages for MxN elements) is sufficient for image collection.
- The system demonstrates robustness even with limited phase control (272°) and amplitude variations.
- Fundamental limits, advantages, and trade-offs of active metasurface imaging are analyzed.
Conclusions:
- Active metasurfaces, particularly with perimeter-control, offer a promising scalable platform for advanced imaging.
- This approach overcomes limitations of passive metasurface systems.
- Future directions include exploring new material platforms for high-efficiency active metasurface imaging.
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