Near-infrared optical response of thin film pH-sensitive hydrogel coated on a gold nanocrescent array

Jiang, Hao; Markowski, Jan; Sabarinathan, Jayshri

doi:10.1364/oe.17.021802

Cited by 36 publications

(36 citation statements)

References 19 publications

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“…The same fitting procedure was repeated on the second set of data and pKa value was found to be 5.51. These values are consistent with previous studies of poly(HEMAco-MAA) polymers [13][14][15]. pKa value gives the pH value for which poly(HEMA-co-MAA) based hydrogel has maximum sensitivities in resonant peak shift was calculated to be 12.81nm/pH and that for integrated transmission to be 16.27/pH unit.…”

Section: Preparation Of Ploy(hema-co-maa)-based Hydrogelsupporting

confidence: 90%

PH sensing based on thin film hydrogel coated silicon gratings

2010

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We demonstrate a pH sensor based on silicon gratings coated with thin film of hydrogels. The silicon gratings have optical sensitivities around 197nm/RIU in detecting refractive index change and 0.824nm per nanometer of thickness change of hydrogel on the surface of silicon gratings. Silicon gratings were silanized so that the hydrogel is chemically bound to its surface. Normal transmission measurement shows the red shift of 155nm in resonant peak for a thin film coating of 187.9nm of hydrogel over them.

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Section: Preparation Of Ploy(hema-co-maa)-based Hydrogelsupporting

confidence: 90%

PH sensing based on thin film hydrogel coated silicon gratings

2010

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“…Two major kinds of these sensors have been developed: (1) Excitation of SPR on a metallic thin film, and measuring the shift of SPR wavelength, or excitation angle, caused by changing the refractive index of surrounding medium [48]. (2) Using metallic nanoparticles in solution [49,50], or in a periodic array [51][52][53][54][55][56][57][58], and measuring the shift of LSPR resulting from the change in the refractive index of surrounding medium. The SPR sensors mainly use the attenuated total internal refraction method for plasmon excitation.…”

Section: Refractive Index Sensor Overviewmentioning

confidence: 99%

“…Nanowire array (S ∼ 300 nm/RIU) [53], nanorod array (S ∼ 884 nm/RIU, FOM ∼ 1), norod array combined with cavity (S ∼ 354 nm/RIU, FOM ∼ 7.1) [54], and gold nanobar array placing close to a thin gold film (S ∼ 600 nm/RIU, FOM ∼ 4.68) [55] are few examples. More complicated structures, such as nanocrescent array (S ∼ 332 nm/RIU, FOM ∼ 0.4) [56], nanocrosses array (S ∼ 500-740 nm/RIU, FOM ∼ 2-2.2) [57], and double nanopillar array with nanogap (S ∼ 1056 nm/RIU, FOM ∼ 12.2) [58] have also been investigated. It has been shown that dipolar couplings of neighboring plasmons in a nanoparticle array tend to very narrow plasmon resonances [59][60][61].…”

Section: Refractive Index Sensor Overviewmentioning

confidence: 99%

Gpu Implementation of Split-Field Finite-Difference Time-Domain Method for Drude-Lorentz Dispersive Media

Shahmansouri¹,

Rashidian²

2012

PIER

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Abstract-Split-field finite-difference time-domain (SF-FDTD) method can overcome the limitation of ordinary FDTD in analyzing periodic structures under oblique incidence. On the other hand, huge run times of 3D SF-FDTD, is practically a major burden in its usage for analysis and design of nanostructures, particularly when having dispersive media. Here, details of parallel implementation of 3D SF-FDTD method for dispersive media, combined with totalfield/scattered-field (TF/SF) method for injecting oblique plane wave, are discussed. Graphics processing unit (GPU) has been used for this purpose, and very large speed up factors have been achieved. Also a previously reported formulation of SF-FDTD based on the Drude model for dispersive media, is extended to cover Drude-Lorentz model, which is usually needed for materials such as gold. The resulting reduction in the number of variables in this formulation, not only helps in reducing the computational time, but also makes it possible to be implemented in GPU, where its memory limitation is a major concern. As an example for demonstrating the importance of this method in optimization of nanophotonics structures, improvement in the performance of a refractive index sensor, made of an array of nanodisks, using suitable angle of incidence is reported. To the best of our knowledge this is the first report of GPU implementation of SF-FDTD method, capable of analyzing periodic dispersive media under oblique incidence.

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“…The combination of a nanostructured metal surface and a pH-sensitive hydrogel was reported previously in the literature (Mack et al, 2007;Jiang et al, 2009;Tokarev et al, 2008;Yao et al, 2010). However, it is still a challenge to use hydrogels in sensor systems with a durability of 1-2 weeks, which is a typical timescale for applications in the medical and biotechnological sector.…”

Section: Introductionmentioning

confidence: 97%

Evaluation of the pH-sensitive swelling of a hydrogel by means of a plasmonic sensor substrate

Kroh

Wuchrer

Guenther

et al. 2018

J. Sens. Sens. Syst.

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Abstract. The inline monitoring of parameters in aqueous liquids is facing an increasing demand in many different application areas. Hydrogels with pH-induced swelling and deswelling behavior offer a means to measure pH in such liquids. Here we investigate the optical interrogation of a pH-sensitive hydrogel which can be applied in the physiological pH range. For this, a nanostructured gold substrate supporting surface plasmon oscillations is coated with a HPMA/DMAEMA/TEGDMA/EG hydrogel. The gel swells in the pH range under investigation (here 4.5 to 6.5), and the resulting refractive index changes subsequently lead to a spectral shift of the plasmon resonance of the gold nanostructure. The spectral resonance position is determined from optical transmittance spectra of the sensor substrates, and the initial results for our hydrogel reported here indicate a nearly linear dependence between the swelling state and the plasmon resonance wavelength.

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Near-infrared optical response of thin film pH-sensitive hydrogel coated on a gold nanocrescent array

Cited by 36 publications

References 19 publications

PH sensing based on thin film hydrogel coated silicon gratings

PH sensing based on thin film hydrogel coated silicon gratings

Gpu Implementation of Split-Field Finite-Difference Time-Domain Method for Drude-Lorentz Dispersive Media

Evaluation of the pH-sensitive swelling of a hydrogel by means of a plasmonic sensor substrate

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