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Tunable metasurface inverse design for 80% switching efficiencies and 144 angular steering
Haejun Chung, Owen D. Miller
Tunable metasurfaces have demonstrated the potential for dramatically enhanced functionality for applications including sensing, ranging and imaging. Liquid crystals (LCs) have fas…
Limits to surface-enhanced Raman scattering near arbitrary-shape scatterers
Jérôme Michon, Mohammed Benzaouia, Wenjie Yao +2
The low efficiency of Raman spectroscopy can be overcome by placing the active molecules in the vicinity of scatterers, typically rough surfaces or nanostructures with various shap…
High-NA Achromatic Metalenses by Inverse Design
Haejun Chung, Owen D. Miller
We use inverse design to discover metalens structures that exhibit broadband, achromatic focusing across low, moderate, and high numerical apertures. We show that standard unit-cel…
Maximal Free-Space Concentration of Electromagnetic Waves
Hyungki Shim, Haejun Chung, Owen D. Miller
We derive upper bounds to free-space concentration of electromagnetic waves, mapping out the limits to maximum intensity for any spot size and optical beam-shaping device. For sub-…
Maximal Spontaneous Photon Emission and Energy Loss from Free Electrons
Yi Yang, Aviram Massuda, Charles Roques-Carmes +7
Free electron radiation such as Cerenkov, Smith--Purcell, and transition radiation can be greatly affected by structured optical environments, as has been demonstrated in a variety…