Rolled-Up Optical Microcavities with Subwavelength Wall Thicknesses for Enhanced Liquid Sensing Applications

Microtubular optical microcavities from rolled-up ring resonators with subwavelength wall thicknesses have been fabricated by releasing prestressed SiO/SiO2 bilayer nanomembranes from photoresist sacrificial layers. Whispering gallery modes are observed in the photoluminescence spectra from the roll...

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Bibliographic Details
Published in:ACS nano 2010-06, Vol.4 (6), p.3123-3130
Main Authors: Huang, Gaoshan, Bolaños Quiñones, Vladimir A, Ding, Fei, Kiravittaya, Suwit, Mei, Yongfeng, Schmidt, Oliver G
Format: Article
Language:English
Subjects:
Crystallization - methods
Equipment Design
Equipment Failure Analysis
Membranes, Artificial
Microfluidic Analytical Techniques - instrumentation
Nanostructures - chemistry
Nanostructures - ultrastructure
Nanotechnology - instrumentation
Optical Devices
Particle Size
Refractometry - instrumentation
Solutions - analysis
Solutions - chemistry
Transducers
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Summary:Microtubular optical microcavities from rolled-up ring resonators with subwavelength wall thicknesses have been fabricated by releasing prestressed SiO/SiO2 bilayer nanomembranes from photoresist sacrificial layers. Whispering gallery modes are observed in the photoluminescence spectra from the rolled-up nanomembranes, and their spectral peak positions shift significantly when measurements are carried out in different surrounding liquids, thus indicating excellent sensing functionality of these optofluidic microcavities. Analytical calculations as well as finite-difference time-domain simulations are performed to investigate the light confinement in the optical microcavities numerically and to describe the experimental mode shifts very well. A maximum sensitivity of 425 nm/refractive index unit is achieved for the microtube ring resonators, which is caused by the pronounced propagation of the evanescent field in the surrounding media due to the subwavelength wall thickness design of the microcavity. Our optofluidic sensors show high potential for lab-on-a-chip applications, such as real-time bioanalytic systems.
ISSN:1936-0851
1936-086X
DOI:10.1021/nn100456r