Title: Automated generation of high-accuracy CAD models for metaform design, fabrication, and testing
Metaforms are novel optical components formed by conforming a metasurface to a freeform substrate. Metaforms can be a powerful solution when designing compact imaging systems such as augmented reality displays. Given the rotationally variant nature of the metaform substrate and the difficulty of metasurface fabrication on curved substrates, the proper alignment of the metasurface nanofeatures to the freeform substrate is essential. Thus, to seamlessly bridge the metaform design, manufacturing, and metrology, we developed a software tool that automatically generates ISO standard highaccuracy CAD models for the designed metaform components. more »« less
Nikolov, Daniel K.; Bauer, Aaron; Cheng, Fei; Kato, Hitoshi; Vamivakas, A. Nick; Rolland, Jannick P.
(, Science Advances)
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(Ed.)
The demand for high-resolution optical systems with a compact form factor, such as augmented reality displays, sensors, and mobile cameras, requires creating new optical component architectures. Advances in the design and fabrication of freeform optics and metasurfaces make them potential solutions to address the previous needs. Here, we introduce the concept of a metaform—an optical surface that integrates the combined benefits of a freeform optic and a metasurface into a single optical component. We experimentally realized a miniature imager using a metaform mirror. The mirror is fabricated via an enhanced electron beam lithography process on a freeform substrate. The design degrees of freedom enabled by a metaform will support a new generation of optical systems.
We present a photoinduced reconfigurable metasurface to enable high spatial resolution terahertz (THz) wave modulation. Conventional photoinduced THz wave modulation uses optically induced conductive patterns on a semiconductor substrate to create programmable passive THz devices. The technique, albeit versatile and straightforward, suffers from limited performance resulting from the severe lateral diffusion of the photogenerated carriers that undermines the spatial resolution and conductivity contrast of the photoinduced conductive patterns. The proposed metasurface overcomes the limitation using a metal-jointed silicon mesa array with subwavelength-scaled dimensions on an insulator substrate. The structure physically restrains the lateral diffusion of the photogenerated carriers while ensuring the electrical conductivity between the silicon mesas , which is essential for THz wave modulation. The metasurface creates high-definition photoconductive patterns with dimensions smaller than the diffusion length of photogenerated carriers. The metasurface provides a modulation depth of −20 to −10 dB for the THz waves between 0.2 to 1.2 THz and supports a THz bandpass filter with a tunable central frequency. The new, to the best of our knowledge, design concept will benefit the implementation of reconfigurable THz devices.
Ferguson, Matthew M; Nikolov, Daniel K; Bauer, Aaron; Clark, Stephan; Hanninen, Adam; Potma, Eric; Rolland, Jannick P
(, Optica Publishing Group)
Freeform and rotationally symmetric optics of a reflective freeform microscope are characterized using a non-contact optical coordinate measuring machine. We demonstrate the importance of datum reference structures, even for rotationally symmetric components.
Nikolov, Daniel K; Fan, Yiwen; Ferguson, Matthew; Lau, Jason; Zou, Hangyue; Rolland, Jannick P
(, Optica Publishing Group)
We are developing a freeform optics CAD tool driven by application needs in industry and research. It supports standardized workflows from design to system assembly, demonstrated for freeform components for compact consumer technology and space optics.
Fan, Yiwen, Nikolov, Daniel K, Vamivakas, A Nick, and Rolland, Jannick P. Automated generation of high-accuracy CAD models for metaform design, fabrication, and testing. SPIE . Web. doi:10.1117/12.2647769.
Fan, Yiwen, Nikolov, Daniel K, Vamivakas, A Nick, & Rolland, Jannick P. Automated generation of high-accuracy CAD models for metaform design, fabrication, and testing. SPIE, (). https://doi.org/10.1117/12.2647769
Fan, Yiwen, Nikolov, Daniel K, Vamivakas, A Nick, and Rolland, Jannick P.
"Automated generation of high-accuracy CAD models for metaform design, fabrication, and testing". SPIE (). Country unknown/Code not available: SPIE. https://doi.org/10.1117/12.2647769.https://par.nsf.gov/biblio/10518277.
@article{osti_10518277,
place = {Country unknown/Code not available},
title = {Automated generation of high-accuracy CAD models for metaform design, fabrication, and testing},
url = {https://par.nsf.gov/biblio/10518277},
DOI = {10.1117/12.2647769},
abstractNote = {Metaforms are novel optical components formed by conforming a metasurface to a freeform substrate. Metaforms can be a powerful solution when designing compact imaging systems such as augmented reality displays. Given the rotationally variant nature of the metaform substrate and the difficulty of metasurface fabrication on curved substrates, the proper alignment of the metasurface nanofeatures to the freeform substrate is essential. Thus, to seamlessly bridge the metaform design, manufacturing, and metrology, we developed a software tool that automatically generates ISO standard highaccuracy CAD models for the designed metaform components.},
journal = {SPIE},
publisher = {SPIE},
author = {Fan, Yiwen and Nikolov, Daniel K and Vamivakas, A Nick and Rolland, Jannick P},
editor = {Kress, Bernard C and Peroz, Christophe}
}
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