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Summer 2023 Photonics Initiative Seminar: Junsuk Rho, Pohang University of Science and Technology (POSTECH), Korea

In this one-hour seminar, Junsuk Rho, Pohang University of Science and Technology (POSTECH), Korea, will be presenting a talk titled:  “Perspectives of design, materials, and fabrication for metasurfaces.”

Abstract – We represent AI-designed metasurfaces[1, 2] and three low-cost manufacturing: 1)
nanoimprinting with high-refractive-index dielectric particle embedding resin (PER)[2-5], 2)
bandgap engineering of hydrogenated amorphous silicon (a-Si:H)[6], and 3) atomic-layer coating
on imprinted resin[7]. a-Si[3], TiO2[2, 4], and ZrO2 PERs[5] are used for metasurfaces at infrared
(940 nm), visible (532 nm), and ultraviolet (325 and 248 nm), respectively; measured efficiencies
reach 47% (940 nm), 91% (532 nm), 72% (325 nm), and 49% (248 nm). PER metasurfaces with
an inverse design provide 3D, full-color holography at visible[2]. The bandgap of a-Si:H is
engineered to suppress optical losses, realizing metasurface efficiencies of 42% (450 nm), 65%
(532 nm), and 75% (635 nm)[6]. We deposit an atomic layer on resin for 12-inch metasurfaces,
achieving measured efficiencies of 61% (450 nm), 78% (532 nm), and 65% (635 nm)[7].
References:
1. “MAXIM: Metasurfaces-oriented electromagnetic wave simulation software with intuitive graphical user
interfaces,” Computer Physics Communications 264, 107846 (2021).
2. “Breaking the information capacity limits of single-celled metasurfaces using inverse design,” Advanced
Materials 35, 2208520 (2023).
3. “Printable nanocomposite metalens for high-contrast near-infrared imaging,” ACS Nano 15, 698-706 (2021).
4. “Metasurface holography reaching the highest efficiency limit in the visible via one-step nanoparticleembedded-
resin printing,” Laser & Photonics Reviews, 16, 2200098 (2022).
5. “Single-step manufacturing of hierarchical dielectric metalens in the visible”, Nature Communications 11, 2268
(2020)
6. “One-step printable platform for high-efficiency metasurfaces down to the deep ultraviolet region,” Light
Science and Applications 12, 68 (2023)
7. “Revealing structural disorder in hydrogenated amorphous silicon for a low-loss photonic platform at visible
frequencies,” Advanced Materials 33, 2005893 (2021).
8. “Mass-production of visible metalenses,” Nature Materials 22, 474-481 (2023).

Bio – Prof. Rho is a Mu-Eun-Jae (无垠斋) Endowed Chair Professor and Young Distinguished
Professor at Pohang University of Science and Technology (POSTECH), Korea, with a double
appointment in the Department of Chemical Engineering and the Department of Mechanical
Engineering. He received his Ph.D. at the University of California, Berkeley (2013), M.S. at the
University of Illinois, Urbana-Champaign (2008) and B.S. at Seoul National University, Korea
(2007) all in Mechanical Engineering. Prior joining POSTECH, he conducted postdoctoral
research in Materials Sciences Division & Molecular Foundry at Lawrence Berkeley National
Laboratory, and also worked as a principal investigator (Ugo Fano Fellow) in Nanoscience and
Technology Division & the Center for Nanoscale Materials at Argonne National Laboratory.
Prof. Rho has authored and co-authored more than 280 high-impact journal papers including
Science, Nature, Nature Nanotechnology, Nature Materials, Nature Photonics and Chemical
Reviews. He is also the recipients of several notable honors and awards such as Samsung Lee
Kun-Hee fellowship (2008-2013), US Department of Energy Argonne Named fellowship (2013-
2016), Edmund Optics Award (2015), SPIE Rising Researcher Award (2017), OSA IMCO Young
Scientist Award (2019), Korean Presidential Early Career Award for Scientists and Engineers
(2019), Springer-Nature MINE Young Scientist Award (2020), Elsevier MEE/MNE Young
Investigator Award and Lectureship (2020), MDPI Micromachines Young Investigator Award
(2020), Member of the Young Korean Academy of Science and Technology (2020), Associate
Member of the National Academy of Engineering of Korea (2022), NAEK Young Engineers Award
(2022), Hong Jin-Ki Creator Award (2022), Fulbright Visiting Scholar Fellowship (2022), Simpson
Fellowship (2022) and Eshbach Fellowship (2023). He serves 14 editorial positions including
Light: Science and Applications (Springer-Nature), Microsystems and Nanoengineering
(Springer-Nature) and Nanophotonics (De Gruyter).

This is an in-person seminar. If you opt to join via Zoom use:

ID 882 0365 5577

Passcode 418552

For further information, please contact:

Leah Abraha

labraha@gc.cuny.edu

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Event Information

Date
June 2
Time
12:00 pm - 1:00 pm
Location
ASRC Auditorium
Address
85 St. Nicholas Terrace
New York, NY 10031 United States
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Event Category: