Au/Si Bilayer Nanodisks with Tunable Localized Surface Plasmon Resonance for Optical Coherence Tomography in the Second Near‐Infrared Window. Issue 2 (18th December 2021)

• Record Type: Journal Article
• Authors: Lee, Jinhyung; Lee, Hyun-Ji; Lee, Sang-Won; Na, Hee-Kyung; Lee, Tae Geol; Wi, Jung-Sub; Kang, Shinill
• Is Part Of: Advanced photonics research. Volume 3:Issue 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-18
• Subjects: contrast agent -- optical coherence tomography -- plasmonic nanodisks -- second near-infrared window -- tunable surface plasmon resonance; Photonics -- Periodicals; 621.36505
• DOI: 10.1002/adpr.202100162
• Languages: English
• ISSNs: 2699-9293

Abstract

Abstract : Bioimaging in the second near‐infrared (NIR‐II) window can help to obtain high‐resolution images and a high penetration depth. This study proposes an Au/Si bilayer plasmonic nanodisk (Au/Si ND) that has a resonance wavelength in the NIR‐II window caused by Si ND stacking on top of the Au ND with a resonance wavelength in the first near‐infrared window; the Si ND has a high refractive index. Au/Si NDs are physically synthesized using nanoimprint lithography and vacuum deposition. Optical coherence tomography (OCT) imaging is performed using synthesized Au/Si NDs as OCT contrast agents in the NIR‐II window. Due to the 2D circular shape and its remarkable response to random incident light, the Au/Si NDs exhibit approximately 250‐fold greater OCT signal intensity than do commercial 1D Au nanorods, as well as fourfold greater penetration depth and improved OCT image contrast. Abstract : Au/Si bilayer nanodisks (NDs) are physically synthesized for optical coherence tomography (OCT) contrast agents with a resonance wavelength in the second near‐infrared (NIR‐II) window. The resonance wavelength of an Au ND can be tuned to the NIR‐II window by stacking an Si ND with high refractive index. NIR‐II window imaging is successfully performed using Au/Si NDs as OCT contrast agents.