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A chip-scale laser platform based on silicon nitride ring resonators and commercial Fabry–Pérot laser diodes is developed for the wavelength range from 404 nm to 785 nm. The achieved coarse and fine tunings are up to 12.5 nm and 33.9 GHz, respectively, with kilohertz-scale linewidths and side-mode suppression ratios above 35 dB.
Metalenz, a spin-out company from Harvard University founded in 2016, has launched its first metasurface-based product. Nature Photonics spoke with co-founder Federico Capasso about the company and its plans for flat optics.
The resonance wavelengths of optical Möbius strip microcavities can be continuously tuned via geometric phase manipulation by changing the thickness-to-width ratio of the strip.
George Palikaras, President and CEO of Meta Materials Inc., discusses the challenges of commercializing metamaterials, learned on the path from a small start-up to a Nasdaq-listed company.
Early research towards bulk metamaterials and exotic properties has been supplanted by work on thin metasurfaces ripe for commercialization, as outlined in this Focus issue.
Geoffroy Lerosey, co-founder and CEO/CSO of Greenerwave, shares how tunable metasurfaces may shake up industries from automotive to wireless communications.
The existence of the optical Berry phase in all-dielectric Möbius-strip cavities is experimentally confirmed. In contrast to a predicted sole Berry phase value of π, arbitrary values of the Berry phase upon adiabatic evolution of a linearly or elliptically polarized light wave are obtained.
Robotic and other devices often demand ever more compact and sophisticated sensors. This Review assesses the opportunities for metasurfaces to provide optical functionality solutions for such applications.
Nonlocal effects—in which the optical response of a system at a given spatial point depends on the field in the surrounding space—are reviewed in the context of metasurfaces and flat optics. Nonlocal flat optics may be useful for controlling light in ultra-thin platforms.
A conversion of quantum information between single-photon and cat-state qubits is demonstrated by teleportation using optical hybrid entanglement. The classical limit of conversion is exceeded over the full Bloch sphere, with an average fidelity above 79%.
Recent developments in reconfigurable metasurfaces are reviewed with a focus on case studies that are promising for commercialization and associated challenges.
Bright upconversion of single nanocrystals is enabled by coupling to a single plasmonic nanocavity mode. An upconversion luminescence enhancement of ~105 was achieved. Single sub-30-nm nanocrystals provided 560 detected photons per second at an excitation intensity of just 0.45 W cm−2.
Using two different designs of superconductor-based detectors, two independent research groups report photon number detection for light pulses with up to 100 photons.
A nonlinear multi-pass cell is shown to be able to shift the central wavelength of a laser by tens of nanometres, offering a new means for control for high-power laser systems
A spatially multiplexed detection system of three transition-edge sensors is developed to resolve photon numbers up to 100 in a single laser pulse. Using the detector to measure parity of a coherent state allows for the extraction of quantum random numbers.
Up to 100 photons are resolved by a waveguide-integrated and hybrid spatiotemporal-multiplexed superconducting nanowire single-photon detector array. Using this detector array, photon statistical behaviour for a true thermal and a coherent light source is verified.
Compact laser-wakefield-driven X-ray sources show promise but suffer from poor conversion efficiency. New research demonstrates high-yield, hard X-rays generated by using carbon nanotube targets, instead of gases.
The addition of DDT to the spiro-OMeTAD hole transport material enhances the stability of perovskite solar cells to humidity, heat and illumination stress. Fabricated devices exhibit a champion certified power conversion efficiency of 23.1%. Also, the devices could retain 90% of the initial efficiency after 1,000 h of continuous illumination, 97% under moisture stress for 530 h and 91% under 144 h of heat stress.
