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HELLO, I'M

Rongyang Xu.

Postdoctor supported by Alexander von Humboldt Foundation

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Rongyang Xu

Postdoc researcher
Kirchhoff-Institut für Physik, Heidelberg University, Germany

rongyang.xu@kip.uni-heidelberg.de

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About

Research interests

Dielectric metasurfaces, all-dielectric perfect absorbers, intergrated photonic circuits, neuromorphic computing, photonic convolutional accelerators.

Education & Experience

Education and experience

Experience:

2024.02-2026.01   Heidelberg University, Postdoctor (Humboldt fellowship), Host: Prof. Dr. Wolfram Pernice (Leibniz Prize Laureate)

2023.01-2024.01   Heidelberg University, Postdoctoral researcher, Supervisor: Prof. Dr. Wolfram Pernice

2022.10-2023.01   Osaka University, Visiting researcher, Supervisor: Prof. Junichi Takahara (JSAP Fellow)

Education:
2019.10-2022.09   Osaka University, Ph.D., Course of Applied Physics, Supervisor: Prof. Junichi Takahara
2016.10-2018.11   Ruhr University Bochum, M.Sc., Lasers and Photonics, Supervisor: Dr. Nathan Jukam, Prof. Dr. Martin Hofmann
2012.10-2016.06   Institute of Technology Tallaght, B.S., Mechanical Engineering, Supervisor: Mr. Paul Dillon
2012.10-2016.06   Nanjing Tech University, B.S., Mechanical Engineering and Automation

About

Honors

2024 The Japan Society of Applied Physics (JSAP) Young Scientist Award

2024 Humboldt Research Fellowship for Postdocs

2022 Support for Pioneering Research Initiated by the Next Generation, Japan Science and Technology Agency (JST)  

Awards & Interests

Publications

Articles:

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First author:

  1. R. Xu, S. Taheriniya, A. Varri, M. Ulanov, I. Konyshev, L. Krämer, L. McRae, F. L. Ebert, J. R. Bankwitz, X. Ma, S. Ferrari, H. Bhaskaran, W. H. P. Pernice, "Mode Conversion Trimming in Asymmetric Directional Couplers Enabled by Silicon Ion Implantation," Nano Lett., 24, 10813-10819.

  2. R. Xu, D. Chen, and J. Takahara, "Perfect absorption of violet light enabled by rotated Mie resonators," J. Appl. Phys., 135, 243109 (2024).

  3. R. Xu and J. Takahara, "Hollow Mie resonators based on toroidal magnetic dipole mode with enhanced sensitivity in refractometric sensing," Appl. Phys. Express, 17, 012005 (2024).

  4. (editor's pick) R. Xu, S. Taheriniya, A. Ovvyan, R. Bankwitz, L. McRae, E. Jung, F. Brückerhoff-Plückelmann, I. Bente, F. Lenzini, H. Bhaskaran, W. H. P. Pernice, "Hybrid photonic integrated circuits for neuromorphic computing [invited]," Opt. Mater. Express 13(12), 3553-3606 (2023).

  5. R. Xu, T. Morimoto, and J. Takahara. "Vertical photon sorting by stacking silicon and germanium nanopillars for broadband absorbers." Nanophotonics, 12(13), 2461-2469 (2023).

  6. R. Xu, J. Fujikata, and J. Takahara. "Graphene perfect absorber based on degenerate critical coupling of toroidal mode." Opt. Lett. 48(6), 1490-1493 (2023).

  7. R. Xu and J. Takahara, "Stacked all-dielectric absorber based on degenerate critical coupling for visible to near-infrared light," Appl. Phys. Express, 15, 122006 (2022).

  8. (Spotlights 2022 & Highlights of 2022) R. Xu and J. Takahara, "Angle-insensitive Huygens’ metasurfaces of quadrupole modes," Appl. Phys. Express, 15, 122003 (2022).

  9. R. Xu and J. Takahara, "Highly sensitive and robust refractometric sensing by magnetic dipole of Si nanodisks," Appl. Phys. Lett.,120, 201104 (2022).

  10. (editor's pick) R. Xu and J. Takahara, "All-dielectric perfect absorber based on quadrupole modes," Opt. Lett. 46(15), 3596-3599 (2021).

  11. R. Xu and J. Takahara, "Radiative loss control of an embedded silicon perfect absorber in the visible region," Opt. Lett. 46(4), 805-808 (2021).

  12. R. Xu, Z. Zhang, A.D. Wieck, and N. Jukam, "Terahertz Fano resonances induced by combining metamaterial modes of the same symmetry," Opt. Express, 28(3), 3932-3941(2020).

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Co-author:

  1. K. Nishida, K. Sasai, R. Xu, T. Yen, Y. Tang, J. Takahara, and S. Chu, "All-optical scattering control in an all-dielectric quasi-perfect absorbing Huygens’ metasurface," Nanophotonics, 12(1), 139-146 (2023).

  2. 高原淳一、Rongyang Xu、酒井隆司：光の構造化は何をもたらすか　"シリコンメタサーフェスにおける多重極子とトロイダルモード"、Microoptics News, Vol. 40, No. 3, pp. 11-16, (2022).

  3. T. Liu, R. Xu, P. Yu, Z. Wang, and J. Takahara, "Multipole and multimode engineering in Mie resonance-based metastructures," Nanophotonics, 9(5), 1115–1137 (2020).

Conferences:

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  1. R. Xu, S. Taheriniya, A. Varri, W. Pernice, "Trimming asymmetric directional couplers for efficient mode conversion using silicon ion." In 3rd International Conference on Physical Computing (ICOPC), Heidelberg, Aug. 26, 2024. (Oral)

  2. R. Xu, S. Taheriniya, A. Varri, F. Brückerhoff-Plückelmann, and W. Pernice, "Performance Optimization of Photonic Accelerators in Neuromorphic Computing via Structure Trimming." In 24th International Conference on Transparent Optical Networks (ICTON), Bari, Jul. 16, 2024. (Oral, Invited)

  3. ​R. Xu, I. Konyshev, W. Pernice, "Exploit higher-order modes in nanophotonic circuits for neuromorphic computing." in 2nd International Conference on Physical Computing (ICOPC), Heidelberg, Sept. 11, 2023. (Poster)

  4. R. Xu and J. Takahara, "High-Sensitivity Silicon Mie Resonators for Refractometric Sensing." In The 83rd JSAP Autumn Meeting, The Japan Society of Applied Physics, Sendai, Sept. 20, 2022. (Oral) 

  5. R. Xu and J. Takahara, "Assembly of All-Dielectric Broadband Perfect Absorbers Based on Degenerate Critical Coupling." In 2022 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR), Sapporo, Aug. 2, 2022. (Oral)

  6. R. Xu and J. Takahara, "Wideband Silicon Perfect Absorber based on Degenerate Critical Coupling." In Optics & Photonics International Congress (OPIC), Yokohama, Apr. 18, 2022. (Oral)

  7. R. Xu, R. Sakai, and J. Takahara, "Perfect Absorption in Hybrid Silicon Metasurfaces." In The 69th JSAP Spring Meeting 2022, The Japan Society of Applied Physics, Mar. 24, 2022, online. (Oral)

  8. R. Xu and J. Takahara, "Perfect absorbing silicon nanopillar metasurfaces enabled by degenerate critical coupling." In Core-to-Core Symposium, Global Nanophotonics, Osaka, Mar. 14, 2022. (Poster)

  9. R. Xu and J. Takahara, "All-Dielectric Perfect Absorber of Quadrupole Modes by using Cross-Shaped Mie Resonators." In 26th Microoptics Conference (MOC), IEEE, Sept. 28, 2021, online. (Poster)

  10. R. Xu and J. Takahara, "Silicon Perfect Absorber of Quadrupole Modes within the visible light range." In JSAP-OSA Joint Symposia, Optical Society of America, Sept. 10, 2021, online. (Oral)

  11. R. Xu and J. Takahara, "Si Perfect Absorber by Degenerate Critical Coupling in Visible Region." In Optics & Photonics International Congress (OPIC), Apr. 19, 2021, online. (Oral)

  12. R. Xu, T. Liu, and J. Takahara, "Field Enhancement by Thin Dielectric Nanodisks as Mie resonator." In JSAP-OSA Joint Symposia, Optical Society of America, Sept. 9, 2020, online. (Oral)

  13. R. Xu, A.D. Wieck, and N. Jukam., "Fano line shapes created in metamaterials by integrating different modes of the same symmetry in composite structures." 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE, Paris, 2019. (Poster)

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Co-author:​

  1. R. Sakai, R. Xu, and J. Takahara, "Silicon perfect absorber metasurface by toroidal dipoles." In The 83rd JSAP Autumn Meeting, The Japan Society of Applied Physics, Sendai, Sept. 23, 2022. (Oral) 

  2. J. Takahara and R. Xu, "Mutual Control of Heat-Light by Si Metasurface." In 2022 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR), Sapporo, Aug. 2, 2022. (Oral) (Invited talk)

  3. K. Sasai, R. Xu, and J. Takahara, "Perfect absorber using single crystalline silicon metasurface." In The 69th JSAP Spring Meeting, The Japan Society of Applied Physics, Mar. 24, 2022, online. (Oral)

  4. K. Sasai, R. Xu, and J. Takahara, "Optimization of single crystalline silicon metasurface perfect absorber for giant photothermal nonlinearity", In Core-to-Core Symposium "Global Nanophotonics 2022", Osaka International Convention Center, Mar. 14, 2022. (poster)

  5. R. Sakai, R. Xu, and J. Takahara, "Design of hollow silicon Mie resonator for degenerate critical coupling", In Core-to-Core Symposium "Global Nanophotonics 2022", Osaka International Convention Center, Mar. 14, 2022. (poster)

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