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 Dean S. Hazineh*, Soon Wei Daniel Lim*, Qi Guo, Federico Capasso, and Todd Zickler. 7/28/2023. “
Polarization Multi-Image Synthesis with Birefringent Metasurfaces.” IEEE International Conference on Computational Photography.
Publisher's Version combined_paper.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 VersionAbstractOptical 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.
Publisher's Version s41467-023-39072-6.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 VersionAbstractExtreme 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