9 May 2011 Tellurite suspended nanowire surrounded with large holes for single-mode SC and THG generations
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Abstract
For a suspended nanowire, the holes surrounding the core are expected to be as large as possible to propagate the light at wavelengths as long as possible. However, the fabrication of nanowire surrounded with large holes is still a challenge so far. In this paper, a method which involves pumping positive pressure of nitrogen gas in both the cane fabrication and fiber-drawing processes, is proposed. A suspended nanowire, with a core diameter of 480 nm and an unprecedented large diameter ratio of holey region to core (DRHC) of at least 62, is fabricated in the length of several hundred meters. Owing to the large holes, the confinement loss of the suspended nanowire is insignificant when the wavelength of light propagated in it is 1700 nm. Additionally, the tube-shaped glass cladding of the suspended nanowire shifts the singlemode cutoff wavelength to 810 nm, which is much shorter than the cutoff wavelength, 1070 nm, of a naked nanowire with the same diameter. A single-mode supercontinuum (SC) generation covering a wavelength range of 900-1600 nm is obtained under 1064 nm pump pulse with the peak power as low as 24 W. A single-mode third harmonic generation (THG) is observed by this nanowire under the pump of a 1557 nm femtosecond fiber laser. This work indicates that the suspended nanowire with large holes can provide high nonlinearity together with single-mode propagation, which leads to interesting applications in compact nonlinear devices.
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Meisong Liao, Meisong Liao, Guanshi Qin, Guanshi Qin, Xin Yan, Xin Yan, Chitrarekha Chaudhari, Chitrarekha Chaudhari, Takenobu Suzuki, Takenobu Suzuki, Yasutake Ohishi, Yasutake Ohishi, } "Tellurite suspended nanowire surrounded with large holes for single-mode SC and THG generations", Proc. SPIE 8073, Optical Sensors 2011; and Photonic Crystal Fibers V, 80732I (9 May 2011); doi: 10.1117/12.886433; https://doi.org/10.1117/12.886433
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