Humidity sensing based on nanoporous polymeric photonic crystals

Shi, Jinjie; Hsiao, Vincent K. S.; Walker, T.G.; Huang, Tony Jun

doi:10.1016/j.snb.2007.08.037

Cited by 66 publications

(37 citation statements)

References 32 publications

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“…Adaptive optical systems are critical in a variety of on-chip biological/chemical assays, including sensing (Levy and Shamai 2007;Zourob et al 2005;Shi et al 2007;Shi et al 2008a), microscopic imaging (Sinton et al 2003;Heng et al 2006;Cui et al 2008;Wu et al 2008), cell sorting (Wang et al 2005), particle manipulation (Monneret et al 2007;Shi et al 2008b;Blakely et al 2008), and single-particle detection/analysis (Yin et al 2007;Hunt and Wilkinson 2008;Yang et al 2009;Mao et al 2009a). However, most optical systems are currently made with solid materials (such as glasses, metals, and semiconductors) .…”

Section: Introductionmentioning

confidence: 99%

Tunable optofluidic microlens through active pressure control of an air–liquid interface

Shi

Stratton

Lin

et al. 2009

Microfluid Nanofluid

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We demonstrate a tunable in-plane optofluidic microlens with a 99 light intensity enhancement at the focal point. The microlens is formed by a combination of a tunable divergent air-liquid interface and a static polydimethylsiloxane lens, and is fabricated using standard soft lithography procedures. When liquid flows through a straight channel with a side opening (air reservoir) on the sidewall, the sealed air in the side opening bends into the liquid, forming an air-liquid interface. The curvature of this air-liquid interface can be conveniently and predictably controlled by adjusting the flow rate of the liquid stream in the straight channel. This change in the interface curvature generates a tunable divergence in the incident light beam, in turn tuning the overall focal length of the microlens. The tunability and performance of the lens are experimentally examined, and the experimental data match well with the results from a ray-tracing simulation. Our method features simple fabrication, easy operation, continuous and rapid tuning, and a large tunable range, making it an attractive option for use in lab-on-a-chip devices, particularly in microscopic imaging, cell sorting, and optical trapping/manipulating of microparticles.

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Section: Introductionmentioning

confidence: 99%

Tunable optofluidic microlens through active pressure control of an air–liquid interface

Shi

Stratton

Lin

et al. 2009

Microfluid Nanofluid

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“…[ 21 ] In addition, several humidity sensors were reported with smaller stopband shifts in the range of tens of nanometers and response times on the order of a few seconds. [ 22,23 ] Recently, Steele et al [ 24 ] and Hawkeye and Brett [ 25 ] presented mesoporous TiO 2 gratings used for humidity applications, which show an ultrafast response time in the subsecond range, but rather small stop band shifts (and therefore resolution) on the order of 30 nm. Here, we replace the dimensionally fl exible organic component in BS by phosphatoantimonic acid H 3 Sb 3 P 2 O 14 nanosheets [ 26,27 ] with giant moisture responsiveness.…”

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confidence: 99%

Touchless Optical Finger Motion Tracking Based on 2D Nanosheets with Giant Moisture Responsiveness

et al. 2015

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A new optical touchless positioning interface based on ultrasensitive humidity responsive 1D photonic crystals utilizing the giant moisture dependent swelling capacity of 2D phosphatoantimonate nanosheets is presented. The spatially confined, full spectral color change combined with reversible transparency switching induced by the humidity sheath of a human finger allows for real time, true color lateral finger motion tracking under touchless conditions.

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“…Another type of coating uses the holographic patterning of polymer-dispersed liquid crystals to form polymeric photonic crystals based on non-porous and nanoporous regions. 72 This leads to rapidly-responding (1.5 second response time) humidity sensors. Upon water uptake by the nanoporous regions, their refractive index changes whilst the non-porous areas remain unchanged.…”

Section: Humidity-responsive Photonic Polymersmentioning

confidence: 99%

Stimuli-responsive photonic polymer coatings

2014

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This feature article focuses on the highlights in the development of photonic polymer coatings that can change their volume or surface topology in a reversible, dynamic fashion when exposed to an external stimulus. Topographic response is established using hydrogels or liquid crystal polymer networks. By changing the surface corrugation in response to light various functional coating properties can be modulated, for instance wettability and/or mechanical friction. The same volume changes in photonic coatings caused by different stimuli lead to changes in light reflection.

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Humidity sensing based on nanoporous polymeric photonic crystals

Cited by 66 publications

References 32 publications

Tunable optofluidic microlens through active pressure control of an air–liquid interface

Tunable optofluidic microlens through active pressure control of an air–liquid interface

Touchless Optical Finger Motion Tracking Based on 2D Nanosheets with Giant Moisture Responsiveness

Stimuli-responsive photonic polymer coatings

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