3D-Printed Micro Lens-in-Lens for In Vivo Multimodal Microendoscopy

Jiawen Li, Simon Thiele, Rodney W Kirk, Bryden C Quirk, Ayla Hoogendoorn, Yung Chih Chen, Karlheinz Peter, Stephen J Nicholls, Johan W Verjans, Peter J Psaltis, Christina Bursill, Alois M Herkommer, Harald Giessen, Robert A McLaughlin

Research output: Contribution to journalArticlepeer-review

Abstract

Multimodal microendoscopes enable co-located structural and molecular measurements in vivo, thus providing useful insights into the pathological changes associated with disease. However, different optical imaging modalities often have conflicting optical requirements for optimal lens design. For example, a high numerical aperture (NA) lens is needed to realize high-sensitivity fluorescence measurements. In contrast, optical coherence tomography (OCT) demands a low NA to achieve a large depth of focus. These competing requirements present a significant challenge in the design and fabrication of miniaturized imaging probes that are capable of supporting high-quality multiple modalities simultaneously. An optical design is demonstrated which uses two-photon 3D printing to create a miniaturized lens that is simultaneously optimized for these conflicting imaging modalities. The lens-in-lens design contains distinct but connected optical surfaces that separately address the needs of both fluorescence and OCT imaging within a lens of 330 µm diameter. This design shows an improvement in fluorescence sensitivity of >10x in contrast to more conventional fiber-optic design approaches. This lens-in-lens is then integrated into an intravascular catheter probe with a diameter of 520 µm. The first simultaneous intravascular OCT and fluorescence imaging of a mouse artery in vivo is reported.

Original languageEnglish
Article number2107032
Pages (from-to)e2107032
JournalSmall
Volume18
Issue number17
Early online date1 Mar 2022
DOIs
Publication statusPublished or Issued - 1 Mar 2022

Keywords

  • 3D printing
  • multimodal imaging
  • near infrared fluorescence
  • optical coherence tomography
  • two-photon laser lithography

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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