Publications by Year: 2023

2023
Rui Jie Tang, Soon Wei Daniel Lim, Marcus Ossiander, Xinghui Yin, and Federico Capasso. 11/14/2023. “Time Reversal Differentiation of FDTD for Photonic Inverse Design.” ACS Photonics, 10, 12, Pp. 4140-4150. Publisher's Version ddfdtd_acsphotonics_authors_manuscript.pdf ddfdtd_acsphotonics_supplementary.pdf
Jinsheng Lu, Vincent Ginis, Soon Wei Daniel Lim, and Federico Capasso. 10/6/2023. “Helicity and Polarization Gradient Optical Trapping in Evanescent Fields.” Phys. Rev. Lett., 131, 14, Pp. 143803. Publisher's Version physrevlett.131.143803.pdf
Yun Kai, Jet Lem, Marcus Ossiander, Maryna L. Meretska, Vyacheslav Sokurenko, Steven E. Kooi, Federico Capasso, Keith A. Nelson, and Thomas Pezeril. 9/7/2023. “High-power laser beam shaping using a metasurface for shock excitation and focusing at the microscale.” Opt. Express, 31, 19, Pp. 31308–31315. Publisher's VersionAbstract
Achieving high repeatability and efficiency in laser-induced strong shock wave excitation remains a significant technical challenge, as evidenced by the extensive efforts undertaken at large-scale national laboratories to optimize the compression of light element pellets. In this study, we propose and model a novel optical design for generating strong shocks at a tabletop scale. Our approach leverages the spatial and temporal shaping of multiple laser pulses to form concentric laser rings on condensed matter samples. Each laser ring initiates a two-dimensional focusing shock wave that overlaps and converges with preceding shock waves at a central point within the ring. We present preliminary experimental results for a single ring configuration. To enable high-power laser focusing at the micron scale, we demonstrate experimentally the feasibility of employing dielectric metasurfaces with exceptional damage threshold, experimentally determined to be 1.1 J/cm2, as replacements for conventional optics. These metasurfaces enable the creation of pristine, high-fluence laser rings essential for launching stable shock waves in materials. Herein, we showcase results obtained using a water sample, achieving shock pressures in the gigapascal (GPa) range. Our findings provide a promising pathway towards the application of laser-induced strong shock compression in condensed matter at the microscale.
oe-31-19-31308.pdf
Yijie Shen, Qiwen Zhan, Logan G Wright, Demetrios N Christodoulides, Frank W Wise, Alan E Willner, Kai-heng Zou, Zhe Zhao, Miguel A Porras, Andy Chong, Chenhao Wan, Konstantin Y Bliokh, Chen-Ting Liao, Carlos Hernández-García, Margaret Murnane, Murat Yessenov, Ayman F Abouraddy, Liang Jie Wong, Michael Go, Suraj Kumar, Cheng Guo, Shanhui Fan, Nikitas Papasimakis, Nikolay I Zheludev, Lu Chen, Wenqi Zhu, Amit Agrawal, Mickael Mounaix, Nicolas K Fontaine, Joel Carpenter, Spencer W Jolly, Christophe Dorrer, Benjamín Alonso, Ignacio Lopez-Quintas, Miguel López-Ripa, Íñigo J Sola, Junyi Huang, Hongliang Zhang, Zhichao Ruan, Ahmed H Dorrah, Federico Capasso, and Andrew Forbes. 8/4/2023. “Roadmap on spatiotemporal light fields.” Journal of Optics, 25, 9, Pp. 093001. Publisher's VersionAbstract
Spatiotemporal sculpturing of light pulse with ultimately sophisticated structures represents a major goal of the everlasting pursue of ultra-fast information transmission and processing as well as ultra-intense energy concentration and extraction. It also holds the key to unlock new extraordinary fundamental physical effects. Traditionally, spatiotemporal light pulses are always treated as spatiotemporally separable wave packet as solution of the Maxwell’s equations. In the past decade, however, more generalized forms of spatiotemporally nonseparable solution started to emerge with growing importance for their striking physical effects. This roadmap intends to highlight the recent advances in the creation and control of increasingly complex spatiotemporally sculptured pulses, from spatiotemporally separable to complex nonseparable states, with diverse geometric and topological structures, presenting a bird’s eye viewpoint on the zoology of spatiotemporal light fields and the outlook of future trends and open challenges.
shen_2023_j._opt._25_093001.pdf
Dean Hazineh, Soon Wei Daniel Lim, Qi Guo, Federico Capasso, and Todd Zickler. 7/28/2023. “Polarization Multi-Image Synthesis with Birefringent Metasurfaces.” In 2023 IEEE International Conference on Computational Photography (ICCP), Pp. 1-12. Publisher's Version polarization_multi-image_synthesis_with_birefringent_metasurfaces.pdf
Christina M. Spaegele, Michele Tamagnone, Soon Wei Daniel Lim, Marcus Ossiander, Maryna L. Meretska, and Federico Capasso. 6/16/2023. “Topologically protected optical polarization singularities in four-dimensional space.” Science Advances, 9, 24, Pp. eadh0369. Publisher's VersionAbstract
Optical singularities play a major role in modern optics and are frequently deployed in structured light, super-resolution microscopy, and holography. While phase singularities are uniquely defined as locations of undefined phase, polarization singularities studied thus far are either partial, i.e., bright points of well-defined polarization, or are unstable for small field perturbations. We demonstrate a complete, topologically protected polarization singularity; it is located in the four-dimensional space spanned by the three spatial dimensions and the wavelength and is created in the focus of a cascaded metasurface-lens system. The field Jacobian plays a key role in the design of such higher-dimensional singularities, which can be extended to multidimensional wave phenomena, and pave the way for unconventional applications in topological photonics and precision sensing. Metasurfaces enable topologically protected polarization singularities, paving the way to fault-tolerant precision sensing.
sciadv.adh0369.pdf
Soon Wei Daniel Lim, Joon-Suh Park, Dmitry Kazakov, Christina M Spaegele, Ahmed H Dorrah, Maryna L Meretska, and Federico Capasso. 6/5/2023. “Point singularity array with metasurfaces.” Nature Communications, 14, 3237. s41467-023-39072-6.pdf
Wei Ting Chen, Joon-Suh Park, Justin Marchioni, Sophia Millay, Kerolos MA Yousef, and Federico Capasso. 5/3/2023. “Dispersion-engineered metasurfaces reaching broadband 90% relative diffraction efficiency.” Nature Communications, 14, Pp. 2544. Publisher's Version HighEfficiency_paper.pdf Associated_simulation_files.zip
Jinsheng Lu, Vincent Ginis, Cheng-Wei Qiu, and Federico Capasso. 5/1/2023. “Polarization-Dependent Forces and Torques at Resonance in a Microfiber-Microcavity System.” Phys. Rev. Lett., 130, Pp. 183601. Publisher's Version physrevlett.130.183601.pdf
Ahmed H. Dorrah, Priyanuj Bordoloi, Vinicius S. de Angelis, Jhonas O. de Sarro, Leonardo A. Ambrosio, Michel Zamboni-Rached, and Federico Capasso. 4/10/2023. “Light sheets for continuous-depth holography and three-dimensional volumetric displays.” Nature Photonics. Publisher's Version s41566-023-01188-y.pdf
Marcus Ossiander, Maryna Leonidivna Meretska, Hana Kristin Hampel, Soon Wei Daniel Lim, Nico Knefz, Thomas Jauk, Federico Capasso, and Martin Schultze. 4/6/2023. “Extreme ultraviolet metalens by vacuum guiding.” Science, 380, 6640, Pp. 59-63. Publisher's VersionAbstract
Extreme ultraviolet (EUV) radiation is a key technology for material science, attosecond metrology, and lithography. Here, we experimentally demonstrate metasurfaces as a superior way to focus EUV light. These devices exploit the fact that holes in a silicon membrane have a considerably larger refractive index than the surrounding material and efficiently vacuum-guide light with a wavelength of  50 nanometers. This allows the transmission phase at the nanoscale to be controlled by the hole diameter. We fabricated an EUV metalens with a 10-millimeter focal length that supports numerical apertures of up to 0.05 and used it to focus ultrashort EUV light bursts generated by high-harmonic generation down to a 0.7-micrometer waist. Our approach introduces the vast light-shaping possibilities provided by dielectric metasurfaces to a spectral regime that lacks materials for transmissive optics. The fields of ultrafast spectroscopy and semiconductor photolithography rely on very short wavelengths, typically in the extreme ultraviolet (EUV) realm. However, most optical materials strongly absorb light in this wavelength regime, resulting in a lack of generally available transmissive components. Ossiander et al. designed and fabricated a metalens in which a carefully engineered array of holes in a thin silicon membrane focuses ultrafast EUV pulses close to the diffraction limit by “vacuum guiding.” The results open up transmissive optics to the EUV regime. —ISO Metalens technology can be pushed into the extreme ultraviolet wavelength regime.
EUV_metalens.pdf
Marcus Ossiander, Maryna L. Meretska, Sarah Rourke, Christina Spaegele, Xinghui Yin, Ileana-Cristina Benea-Chelmus, and Federico Capasso. 2/27/2023. “Metasurface-stabilized optical microcavities.” Nature Communications, 14, Pp. 1114. Publisher's Version s41467-023-36873-7.pdf
Lisa W. Li, Noah A. Rubin, Michael Juhl, Joon Suh Park, and Federico Capasso. 2/22/2023. “Evaluation and characterization of imaging polarimetry through metasurface polarization gratings.” Appl. Opt., 62, 7, Pp. 1704–1722. Publisher's VersionAbstract
Metasurfaces are a new class of diffractive optical elements with subwavelength elements whose behavior can be lithographically tailored. By leveraging form birefringence, metasurfaces can serve as multifunctional freespace polarization optics. Metasurface gratings are novel, to the best of our knowledge, polarimetric components that integrate multiple polarization analyzers into a single optical element enabling the realization of compact imaging polarimeters. The promise of metasurfaces as a new polarization building block is contingent on the calibration of metagrating-based optical systems. A prototype metasurface full Stokes imaging polarimeter is compared to a benchtop reference instrument using an established linear Stokes test for 670, 532, and 460&\#x00A0;nm gratings. We propose a complementary full Stokes accuracy test and demonstrate it using the 532&\#x00A0;nm grating. This work presents methods and practical considerations involved in producing accurate polarization data from a metasurface-based Stokes imaging polarimeter and informs their use in polarimetric systems more generally.
ao-62-7-1704.pdf
Vincent Ginis, Ileana-Cristina Benea-Chelmus, Jinsheng Lu, Marco Piccardo, and Federico Capasso. 1/30/2023. “Resonators with tailored optical path by cascaded-mode conversions.” Nature Communications, 14, Pp. 495. Publisher's VersionAbstract

Optical resonators enable the generation, manipulation, and storage of electromagnetic waves. The physics underlying their operation is determined by the interference of electromagnetic waves, giving rise to the resonance spectrum. This mechanism causes the limitations and trade-offs of resonator design, such as the fixed relationship between free spectral range, modal linewidth, and the resonator’s refractive index and size. Here, we introduce a new class of optical resonators, generating resonances by designing the optical path through transverse mode coupling in a cascaded process created by mode-converting mirrors. The generalized round-trip phase condition leads to resonator characteristics that are markedly different from Fabry-Perot resonators and can be tailored over a wide range. We confirm the existence of these modes experimentally in an integrated waveguide cavity with mode converters coupling transverse modes into one supermode. We also demonstrate a transverse mode-independent transmission and show that its engineered spectral properties agree with theoretical predictions.

s41467-023-35956-9.pdf
Giampaolo Pitruzzello. 2023. “Metaoptics for the consumer market (Interview with Prof. Capasso) .” Nature Photonics, 17, Pp. 6-7. Publisher's Version naturephotonics_interview_capasso.pdf