Multiplasmonic Optical Sensor Using Sculptured Nematic Thin Films

Abbas, Farhat; Naqvi, Qaisar Abbas; Faryad, Muhammad

doi:10.1007/s11468-015-9920-7

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…The void regions of uninfiltrated SNTF were taken to be vacuous for this purpose. 24. Bruggeman homogenization formalism is widely used 22,23 and provides a suitable framework for this work.…”

Section: Modeling Of Sculptured Nematic Thin Filmmentioning

confidence: 99%

Dyakonov–Tamm waves-based optical sensing using sculptured nematic thin film

2015

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Dyakonov-Tamm (DT) waves are highly sensitive to the constitutive properties of the partnering materials near the interface. DT waves are excited at the interface of two dielectric materials of which at least one is anisotropic and periodically nonhomogeneous normal to their interface. Sculptured nematic thin film (SNTF) is a good candidate for the periodically nonhomogeneous dielectric partner for optical sensing of a fluid due to its porosity. The nanoscale parameters of an uninfiltrated SNTF obtained from the inverse Bruggeman homogenization formalism were used in the forward Bruggeman homogenization formalism to determine the constitutive parameters for the infiltrated SNTF. The sensitivity of DT waves to the refractive index was analyzed for two possible sensing modalities and it was found that the sensitivity was comparable to that of the chiral sculptured thin films (STFs) made of the same material as of the SNTF. This implies that the sensing with DT waves is robust, is independent of the morphology of the partnering nonhomogeneous dielectric material and could make the sensing easier since SNTFs are easier to fabricate than the chiral STFs. Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/19/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Optical Engineering 067109-4 June 2015 • Vol. 54(6) Abbas, Naqvi, and Faryad: Dyakonov-Tamm waves-based optical sensing using sculptured nematic thin film Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/19/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Section: Modeling Of Sculptured Nematic Thin Filmmentioning

confidence: 99%

Dyakonov–Tamm waves-based optical sensing using sculptured nematic thin film

2015

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“…Multiple SPP waves provide the opportunity for more reliable and more sensitive optical sensing than a single SPP wave. This has been established both theoretically and experimentally using sculptured thin films (STFs) as porous PHD materials [14,16,17]. However, the effect of infiltration of the STF by metal nanoparticles in a multiple-SPP-waves-based sensing scenario is not known.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Dynamic Sensitivity of Multiple Surface-plasmonic-polaritonic Sensor Using Silver Nanoparticles

et al. 2015

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Multiple surface plasmon-polariton (SPP) waves excited at the interface of a homogeneous isotropic metal and a chiral sculptured thin film (STF) impregnated with silver nanoparticles were theoretically assessed for the multiple-SPP-waves-based sensing of a fluid uniformly infiltrating the chiral STF. The Bruggemann homogenization formalism was used in two different modalities to determine the three principal relative permittivity scalars of the silver-nanoparticle-impregnated chiral STF infiltrated uniformly by the fluid. The dynamic sensitivity increased when silver nanoparticles were present, provided their volume fraction did not exceed about 1%.

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A highly sensitive multiplasmonic sensor using hyperbolic chiral sculptured thin films

Abbas

Faryad

2017

Journal of Applied Physics

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Surface plasmon-polariton (SPP) waves guided by an interface of a metal and a hyperbolic chiral sculptured thin film (STF) were theoretically investigated for optical sensing of an analyte. The chiral STF was infiltrated with the analyte to be sensed, and the resulting change in the incidence angle of excitation of the SPP waves in the prism-coupled configuration was computed. The results indicated the potential of this configuration for a plasmonic sensor with sensitivity up to 6000 degrees per refractive index units of the infiltrating fluid in the angular investigation scheme, with multiple SPP waves of the same frequency but different phase speeds, spatial profiles, and sensitivities. The enhancement in the sensitivity is attributed to the high field strength of the SPP waves near the interface. A multiplasmonic sensor is advantageous because of its potential for higher confidence in the measurement of the same analyte.

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Multiplasmonic Optical Sensor Using Sculptured Nematic Thin Films

Cited by 3 publications

References 19 publications

Dyakonov–Tamm waves-based optical sensing using sculptured nematic thin film

Dyakonov–Tamm waves-based optical sensing using sculptured nematic thin film

Enhancement of Dynamic Sensitivity of Multiple Surface-plasmonic-polaritonic Sensor Using Silver Nanoparticles

A highly sensitive multiplasmonic sensor using hyperbolic chiral sculptured thin films

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