NaioSTM used in high external-efficiency nanofocusing for lens-free near-field optical nanoscopy

Researchers from the University of California demonstrated a two-step sequential nanofocusing technique to achieve high-efficiency, broadband and dual-directional nanofocusing for near-field optical excitation and spectrum collection.

Nature Photonics (2019)

Sanggon Kim, Ning Yu, Xuezhi Ma, Yangzhi Zhu, Qiushi Liu, Ming Liu & Ruoxue Yan

Abstract

Researchers from the University of California demonstrated a two-step sequential nanofocusing technique to achieve high-efficiency, broadband and dual-directional nanofocusing for near-field optical excitation and spectrum collection. They achieved an external nanofocusing efficiency of ~50% over nearly all the visible range on a fibre-coupled nanowire scanning probe, which is capable of both light delivery and spectrum collection with nanoscale spatial resolution. By integrating this with a NaioSTM they were able to demonstrate lens-free tip-enhanced Raman spectroscopy and achieved 1 nm spatial resolution. The high performance and vast versatility offered by this fibre-based nanofocusing technique allow for the easy incorporation of nano-optical microscopy into various existing measurement platforms.

Their work was published in Nature Photonics (2019).

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