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Suspended subwavelength grating waveguides on SOI for ultra-broadband operation

In this paper, we provide a new type of subwavelength grating waveguides (SWGs) with a guiding mechanism from 1.5μm to 6μm on a silicon-on-insulator (SOI) platform. Two different SWGs with the same period but different height, corresponds to different effective subwavelength refractive indices, are designed and served as the core and cladding respectively. The biggest hindrance for transmission bandwidth, the buried oxide, is then removed to build up a suspended SWGs, contributing to bandwidth enlargement. In the meantime, the results also show light-matter interaction enhancement that ~34% propagating energy locates in the air can fully interact with testing analytes, leading to higher sensitivity. The broadband and high light-matter integral signatures would address the demands for ideal absorption spectroscopy based lab-on-chip.