ORCID Profile
0000-0003-4209-5186
Current Organisation
Zhejiang University
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Publisher: Wiley
Date: 02-04-2021
Abstract: Optical microsphere resonators working in the near‐ and mid‐infrared regions are highly required for a variety of applications, such as optical sensors, filters, modulators, and microlasers. Here, a simple and low‐cost approach is reported for batch fabrication of high‐quality chalcogenide glass (ChG) microsphere resonators by melting high‐purity ChG powders in an oil environment. Q factors as high as 1.2 × 10 6 (7.4 × 10 5 ) are observed in As 2 S 3 (As 2 Se 3 ) microspheres (≈30 µm in diameter) around 1550‐nm wavelength. Smaller microspheres with sizes around 10 µm also show excellent resonant responses ( Q ≈ 2.5 × 10 5 ). Based on the mode splitting of an azimuthal mode in a microsphere resonator, eccentricities as low as ≈0.13% (≈0.17%) for As 2 S 3 (As 2 Se 3 ) microspheres are measured. Moreover, by coupling ChG microspheres with a biconical As 2 S 3 fiber taper, Q factors of ≈1.7 × 10 4 (≈1.6 × 10 4 ) are obtained in As 2 S 3 (As 2 Se 3 ) microspheres in the mid‐infrared region (around 4.5 µm). The high‐quality ChG microspheres demonstrated here are highly attractive for near‐ and mid‐infrared optics, including optical sensing, optical nonlinearity, cavity quantum electrodynamics, microlasers, nanofocusing, and microscopic imaging.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 06-09-2019
Abstract: Spectrometers with ever-smaller footprints are sought after for a wide range of applications in which minimized size and weight are paramount, including emerging in situ characterization techniques. We report on an ultracompact microspectrometer design based on a single compositionally engineered nanowire. This platform is independent of the complex optical components or cavities that tend to constrain further miniaturization of current systems. We show that incident spectra can be computationally reconstructed from the different spectral response functions and measured photocurrents along the length of the nanowire. Our devices are capable of accurate, visible-range monochromatic and broadband light reconstruction, as well as spectral imaging from centimeter-scale focal planes down to lensless, single-cell-scale in situ mapping.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 08-07-2022
Abstract: Laser based on single plasmonic nanoparticle can provide optical frequency radiation far beyond the diffraction limit and is one of the ultimate goals of nanolasers, yet it remains a challenge to be realized because of the inherently high Ohmic loss. Here, we report the direct observation of lasing in microfiber-coupled single plasmonic nanoparticles enabled by strong mode coupling. We show that, by strongly coupling a gold nanorod (GNR) with the whispering gallery cavity of a dye-doped polymer microfiber (with diameter down to 2.0 μm), the substantially enhanced optical coherence of the hybrid photon-plasmon mode and effective gain accumulated from the active microfiber cavity enable single-mode laser emission from the GNR at room temperature with a threshold as low as 2.71 MW/cm 2 and a linewidth narrower than 2 nm.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Pan Wang.