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            We report Ge23Sb7S70 chalcogenide ring resonators with up to 8 × 104 quality factors operating around 3.6 µm wavelength fabricated through e-beam lithography. Their rib waveguide geometry can be engineered to support close-to-zero dispersion modes needed for mid-infrared microcomb generation.more » « less
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            We have developed a versatile transition metal-free cross-coupling reaction between fluorinated benzyl electrophiles and alkenylboronic acids in the presence of the equivalent amount of alkali metal salts such as K 3 PO 4 . This transition metal-free protocol gives good chemical yields for a wide range of substrates and demonstrates good functional group tolerance.more » « less
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