Tunable and ultra-narrow linewidth lasers that are fully integrated remain a missing component and challenge for the thin-film lithium niobate platform, while being useful for applications ranging from data communication to signal processing. Here, we present, for the first time, the demonstration of fully integrated, extended cavity diode lasers combining C-band semiconductor gain chips with TFLN using photonic wire bonding. By leveraging the scalability of photonic wirebonding the laser, with two intra-cavity RSOAs, produces a high on-chip output power of 35 mW and shows single frequency operation with more than 61 dB side mode suppression. By adjusting on-chip heaters the laser can be tuned over >40 nm across the entire gain bandwidth. Using delayed self-heterodyne detection an ultra-narrow, intrinsic linewidth of 1.4 kHz is measured.
Here we present high quality factor (high-Q) metasurfaces as a new platform for continuous, electro-optical reconfigurability. Using full-field simulations, we show how applying a voltage across individual nanoantenna shifts the spectral position of the high-Q resonance, modifying the antenna phase and amplitude, and achieving a full 2 pi phase variation with reflectance above 93%. We next computationally design a modulatable beam steerer; without bias light is directly reflected from the metasurface, whereas with applied biases of +9.2, 0, and -9.2 V across three constituent antennas the light is diffracted to 30 deg with 65% efficiency. Biases of 13, 2, -2, and -13 V across 4 constituent antennas diffract to 22 deg. Our presentation will discuss not only the design but also fabrication and characterization en route to a versatile metasurface platform that can reconfigurably achieve a variety of transfer functions.
We present an all-optical, label-free technology for quantitative, real-time cancer tissue diagnostics on a single, clinically-compatible chip. Periodically-arranged sub-wavelength dielectric nanostructures, known as metasurfaces, are patterned into dielectric layers on glass microscope coverslips, where biopsied tumor tissue sections can be deposited following routine clinical procedure. We numerically and experimentally map the anisotropy and orientation of collagen fibers, a quantitative marker of cancer stage in tissue, onto metasurface structural color. Working at the interface of nanoscale optics and medicine, our colorimetric metasurface platform has the potential to set a new benchmark for rapid, quantitative and cost-effective cancer tissue diagnostics.
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