3D-nanoprinted on-chip antiresonant waveguide with hollow core and microgaps for integrated optofluidic spectroscopy

KIM, JISOO; BÜRGER, JOHANNES; JANG, BUMJOON; ZEISBERGER, MATTHIAS; GARGIULO, JULIAN; MENEZES, LEONARDO DE S.; MAIER, STEFAN A.; SCHMIDT, MARKUS A.

OPTICS EXPRESS

OPTICAL SOC AMER

Lugar: Washington; Año: 2023 vol. 31

1094-4087

Here, we unlock the properties of the recently introduced on-chip hollow-coremicrogap waveguide in the context of optofluidics which allows for intense light-water interactionover long lengths with fast response times. The nanoprinted waveguide operates by the antiresonance effect in the visible and near-infrared domain and includes a hollow core with definedgaps every 176 µm. The spectroscopic capabilities are demonstrated by various absorption-relatedexperiments, showing that the Beer-Lambert law can be applied without any modification. Inaddition to revealing key performance parameters, time-resolved experiments showed a decisiveimprovement in diffusion times resulting from the lateral access provided by the microgaps.Overall, the microgap waveguide represents a pathway for on-chip spectroscopy in aqueousenvironments.