KEYWORDS: Design and modelling, Lens design, Optical design, Metalenses, Commercial off the shelf technology, Wavefronts, Optics manufacturing, Near field optics, Manufacturing, Flat optics
We present a nano-to-macroscale design methodology for hybrid metalens refractive optical systems, and evaluate our approach by fabricating and characterizing an F/1.4, 22.5mm diameter aperture visible band air-spaced doublet.
We present phonic funnels, a novel material platform, that enables a smooth optical link between the diffraction-limited and deep subwavelength areas. Photonic funnels comprise conical structures with hyperbolic cores that enable highly confined propagation of light and perfectly conducting walls that isolate the core of the funnel from the surroundings. We demonstrate realization of the funnels with semiconductor metamaterial platform, with minimum diameter of the opening of the order of 1/30-th of free space wavelength and characterize propagation of light through the funnels experimentally and theoretically. We also analyze funnel-induced modulation of emission.
In this talk I will discuss our group’s work on the design, growth, fabrication and characterization of a new class of all-epitaxial plasmonic optoelectronic devices with enhanced performance when compared to state-of-the-art infrared optoelectronics. Specifically, we demonstrate that highly doped semiconductors, serving as ‘designer’ plasmonic materials, can be monolithically integrated with a range of infrared optoelectronic device architectures to provide strong field confinement, and enhanced emission, detection, and potentially modulation capabilities in the mid-infrared. We will present results from long-wave infrared detectors with thickness of only 350 nm, capable of over 50% external quantum efficiency and state-of-the-art detectivity, as well as dual color detectors, spectrally-selective detectors, and enhanced efficiency emitters leveraging our designer plasmonic materials with a range of novel device architectures.
Photonic funnels, conical structures with hyperbolic cores, that have been recently demonstrated at mid-IR frequencies, provide a platform to avoid the diffraction limit and enable a smooth optical link between the nanoscale and microscale. Orbital angular momentum (OAM) of beams play important role in optical manipulation, microscopy, and potentially optical communications.. In this work we analyze theoretically the interaction structured light (light that has non-zero OAM) with photonic funnels. In particular, we study the effect of light confinement, facilitated through the geometric profile of the funnel, on spatial structure of the mode, and its local intensity.
We analyze the mid-infrared emission resulting from the interplay between a type-II superlattice (T2SL) material and semiconductor-based plasmonic “designer metals”. We demonstrate an order of magnitude emission enhancement, accompanied by spectral reshaping, relative to all-dielectric T2SL counterparts and provide a theoretical description of the underlying physics. The all-semiconductor LWIR emitters with integrated plasmonic components, developed in this work, represent novel approach to broadband room-temperature mid-IR sources.
We develop photonic funnels, structures that provide efficient optical coupling between nano- and micro-worlds. The funnels represent conical waveguides with highly anisotropic cores and highly conductive cladding that have one opening with crossection of the order of free space wavelength and the second opening with deep subwavelength crossection. We fabricate all-semiconductor photonic funnels at mid-infrared frequency range and demonstrate, theoretically and experimentally, efficient confinement of mid-infrared light to wavelength/30 areas. Theoretically, we predict efficient out-coupling of light from ultra-small areas to diffraction-limited domain.
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