Publications by authors named "C Hail"
Article Synopsis
- Researchers use laser spectroscopy at very low temperatures (2 K) to study single dibenzoterrylene (DBT) molecules in tiny anthracene crystals made through a special printing technique.
- They find that the light emitted by these single molecules has very sharp transitions, almost as clear as those seen in bulk materials, indicating high-quality optical properties.
- By taking super-resolution images and changing the polarization of the light, they can measure the size and orientation of the crystals, which is important for future applications involving precisely placed quantum emitters.
High quality factor optical nanostructures provide a great opportunity to enhance nonlinear optical processes such as third harmonic generation. However, the field enhancement in these high quality factor structures is typically accompanied by optical mode nonlocality. As a result, the enhancement of nonlinear processes comes at the cost of their local control as needed for nonlinear wavefront shaping, imaging, and holography.
View Article and Find Full Text PDFThe strong interaction of light with micro- and nanostructures plays a critical role in optical sensing, nonlinear optics, active optical devices, and quantum optics. However, for wavefront shaping, the required local control over light at a subwavelength scale limits this interaction, typically leading to low-quality-factor optical devices. Here, we demonstrate an avenue towards high-quality-factor wavefront shaping in two spatial dimensions based on all-dielectric higher-order Mie-resonant metasurfaces.
View Article and Find Full Text PDFTwo-dimensional transition metal dichalcogenides (2D TMDCs) are promising candidates for ultrathin active nanophotonic elements due to the strong tunable excitonic resonances that dominate their optical response. Here, we demonstrate dynamic beam steering by an active van der Waals metasurface that leverages large complex refractive index tunability near excitonic resonances in monolayer molybdenum diselenide (MoSe). Through varying the radiative and nonradiative rates of the excitons, we can dynamically control both the reflection amplitude and phase profiles, resulting in an excitonic phased array metasurface.
View Article and Find Full Text PDFArticle Synopsis
- Active metasurfaces are advanced nanophotonic devices that can dynamically manipulate light by responding to external stimuli, allowing for control over reflected or transmitted light's characteristics.
- These metasurfaces can manage properties like amplitude, phase, polarization, spectrum, and momentum, making them capable of shaping light waves effectively.
- The article explores methods to develop high-performance active metasurfaces, including two-dimensional control and practical uses in optical imaging, communication, and computation.