Robert Lupoiu

All Publications

• Conformal Aberration-Correcting Spaceplates LASER & PHOTONICS REVIEWS Shao, Y., Wang, Z., Dai, T., Lupoiu, R., Kim, Y., Milster, T. D., Fan, J. A. 2026

  View details for DOI 10.1002/lpor.202502414

  View details for Web of Science ID 001653747400001

• A multi-agentic framework for real-time, autonomous freeform metasurface design. Science advances Lupoiu, R., Shao, Y., Dai, T., Mao, C., Edée, K., Fan, J. A. 2025; 11 (44): eadx8006

  Abstract

  Innovation in nanophotonics currently relies on human experts who synergize specialized knowledge in photonics and coding with simulation and optimization algorithms, entailing design cycles that are time-consuming, computationally demanding, and frequently suboptimal. We introduce MetaChat, a multi-agentic design framework that can translate semantically described photonic design goals into high-performance, freeform device layouts in an automated, nearly real-time manner. Multistep reasoning is enabled by our Agentic Iterative Monologue paradigm, which coherently interfaces agents with code-based tools, other specialized agents, and human designers. Design acceleration is facilitated by Feature-wise Linear Modulation-conditioned Maxwell surrogate solvers that support the generalized evaluation of metasurface structures. We use freeform dielectric metasurfaces as a model system and demonstrate with MetaChat the design of multiobjective, multiwavelength metasurfaces orders of magnitude faster than conventional methods. These concepts present a scientific computing blueprint for using specialist design agents, surrogate solvers, and human interactions to drive multiphysics innovation and discovery.

  View details for DOI 10.1126/sciadv.adx8006

  View details for PubMedID 41171904

• Multifunctional Spaceplates for Optical Aberration Correction ACS PHOTONICS Shao, Y., Lupoiu, R., Jiang, J., Zhou, Y., Milster, T. D., Fan, J. A. 2024

  View details for DOI 10.1021/acsphotonics.4c00086

  View details for Web of Science ID 001189157400001

• Atomically Precise Manufacturing of Silicon Electronics. ACS nano Pitters, J., Croshaw, J., Achal, R., Livadaru, L., Ng, S., Lupoiu, R., Chutora, T., Huff, T., Walus, K., Wolkow, R. A. 2024

  Abstract

  Atomically precise manufacturing (APM) is a key technique that involves the direct control of atoms in order to manufacture products or components of products. It has been developed most successfully using scanning probe methods and has received particular attention for developing atom scale electronics with a focus on silicon-based systems. This review captures the development of silicon atom-based electronics and is divided into several sections that will cover characterization and atom manipulation of silicon surfaces with scanning tunneling microscopy and atomic force microscopy, development of silicon dangling bonds as atomic quantum dots, creation of atom scale devices, and the wiring and packaging of those circuits. The review will also cover the advance of silicon dangling bond logic design and the progress of silicon quantum atomic designer (SiQAD) simulators. Finally, an outlook of APM and silicon atom electronics will be provided.

  View details for DOI 10.1021/acsnano.3c10412

  View details for PubMedID 38376086

• High Speed Simulation and Freeform Optimization of Nanophotonic Devices with Physics-Augmented Deep Learning ACS PHOTONICS Chen, M., Lupoiu, R., Mao, C., Huang, D., Jiang, J., Lalanne, P., Fan, J. A. 2022

  View details for DOI 10.1021/acsphotonics.2c00876

  View details for Web of Science ID 000848111900001

• WaveY-Net: Physics-Augmented Deep Learning for High-Speed Electromagnetic Simulation and Optimization Chen, M., Lupoiu, R., Mao, C., Huang, D., Jiang, J., Lalanne, P., Fan, J. A. edited by Chang-Hasnain, C. J., Fan, J. A., Zhou, W. SPIE-INT SOC OPTICAL ENGINEERING. 2022

  View details for DOI 10.1117/12.2612418

  View details for Web of Science ID 000836330700011

• MetaNet: a new paradigm for data sharing in photonics research OPTICS EXPRESS Jiang, J., Lupoiu, R., Wang, E. W., Sell, D., Hugonin, J., Lalanne, P., Fan, J. A. 2020; 28 (9): 13670–81

  Abstract

  Optimization methods are playing an increasingly important role in all facets of photonics engineering, from integrated photonics to free space diffractive optics. However, efforts in the photonics community to develop optimization algorithms remain uncoordinated, which has hindered proper benchmarking of design approaches and access to device designs based on optimization. We introduce MetaNet, an online database of photonic devices and design codes intended to promote coordination and collaboration within the photonics community. Using metagratings as a model system, we have uploaded over one hundred thousand device layouts to the database, as well as source code for implementations of local and global topology optimization methods. Further analyses of these large datasets allow the distribution of optimized devices to be visualized for a given optimization method. We expect that the coordinated research efforts enabled by MetaNet will expedite algorithm development for photonics design.

  View details for DOI 10.1364/OE.388378

  View details for Web of Science ID 000530854700092

  View details for PubMedID 32403837

• SiQAD: A Design and Simulation Tool for Atomic Silicon Quantum Dot Circuits IEEE TRANSACTIONS ON NANOTECHNOLOGY Ng, S., Retallick, J., Chiu, H., Lupoiu, R., Livadaru, L., Huff, T., Rashidi, M., Vine, W., Dienel, T., Wolkow, R. A., Walus, K. 2020; 19: 137-146

  View details for DOI 10.1109/TNANO.2020.2966162

  View details for Web of Science ID 000516594700001