Single-Crystalline Li 2 Sn(IO 3 ) 6 Microwires: Combining Optical-Waveguiding and Frequency-Doubling Functions.

High-quality single-crystalline Li 2 Sn(IO 3 ) 6 microwires (MWs) have been successfully prepared by using a facile hydrothermal method. The as-synthesized Li 2 Sn(IO 3 ) 6 MWs exhibit regular hexagonal prism morphology, excellent surface smoothness, and remarkable diameter uniformity. The optical propagation loss has been determined to be as low as 0.026 dB μm -1 at 785 nm wavelength, implying the low-loss optical waveguiding capability of the Li 2 Sn(IO 3 ) 6 MWs. The effective frequency-doubling conversions of the fundamental frequency light source in the wavelength range from 916 to 1560 nm have been observed, and the second-harmonic generation (SHG) conversion efficiency has been measured to be 2.1% with a 1560 nm fundamental pump source (pulse duration of 10 ns, and average power of 9.06 nW) transmitted through a 1.32-μm-diameter and 300-μm-length Li 2 Sn(IO 3 ) 6 MW. These intriguing optical waveguiding and strong SHG conversion capabilities of the Li 2 Sn(IO 3 ) 6 MWs suggest its potential applications for photonic devices in micrometer scale.