LSPR based optical fiber sensors treated with nanosecond laser irradiation for refractive index sensing

Spasopoulos, Dimosthenis; Kaziannis, S.; Danakas, S.; Ikiades, A.; Kosmidis, C.

doi:10.1016/j.snb.2017.10.095

Cited by 13 publications

(9 citation statements)

References 36 publications

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“…Dependence of the refractive index on the temperature of the medium is a well understood phenomenon [40,41]. It is also evident from the corpus of literature available on the subject, that the LSPR depends on the refractive index of the medium [31,68]. Therefore, we used already published data to analytically calculate the changes in the refractive indices of some small organic molecules that are liquid (at room temperature) and water around the temperature range that our simulation results predicted.…”

Section: Resultsmentioning

confidence: 84%

“…A light source from Ocean Optics (DH-2000) with an output power of 950 µW was set up. The light source used by us was the same as that used by [31,36]. The output from the light source was fed into an optical fiber that terminated at a Neutral Density Filter (ND-filter).…”

Section: Experimental Designmentioning

confidence: 99%

“…In an attempt to attain a small localized resolution, attempts have been made to equip optical fibers with nano-antennas. These studies can be categorized into three groups: (i) Those that use a geometry modified optical fiber [30][31][32], (ii) those that equip facets of a fiber with nano antenna [32][33][34][35][36], and most recently (iii) those that use a tapered fiber [37,38]. These studies [37,38] use tapered fiber tips as TERS tips.…”

Section: Introductionmentioning

confidence: 99%

“…As the LSPR spectrum depends on the refractive index of the environment [1], all of these methods operate by being able to distinguish subtle changes in the refractive index of the environment through the associated changes in the LSPR. These sensors are reportedly to be so sensitive that they can even distinguish a refractive index change of about 0.001 RIU [31]. The dependence of the refractive index on temperature and the input wavelength of the incoming electromagnetic wave [40,41] is well understood.…”

Section: Introductionmentioning

confidence: 99%

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Photothermal Effect in Plasmonic Nanotip for LSPR Sensing

Nisar

Kang

Zhao

2020

Sensors

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The influence of heat generation on the conventional process of LSPR based sensing has not been explored thus far. Therefore, a need exists to draw attention toward the heat generation issue during LSPR sensing as it may affect the refractive index of the analyte, leading to incorrect sensory conclusions. This manuscript addresses the connection between the photo-thermal effect and LSPR. We numerically analyzed the heat performance of a gold cladded nanotip. The numerical results predict a change in the micro-scale temperature in the microenvironment near the nanotip. These numerical results predict a temperature increase of more than 20 K near the apex of the nanotip, which depends on numerous factors including the input optical power and the diameter of the fiber. We analytically show that this change in the temperature influences a change in the refractive index of the microenvironment in the vicinity of the nanotip. In accordance with our numerical and analytical findings, we experimentally show an LSPR shift induced by a change in the input power of the source. We believe that our work will bring the importance of temperature dependence in nanotip based LSPR sensing to the fore.

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Section: Resultsmentioning

confidence: 84%

Section: Experimental Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photothermal Effect in Plasmonic Nanotip for LSPR Sensing

Nisar

Kang

Zhao

2020

Sensors

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“…In several works, the significant impact from the LSPR of metal NPs with spherical or other free shaped morphology on the SPR effect of pure metal film has been verified. Spasopoulos et al have experimentally verified that the optical fiber refractive index sensor is constructed by combining dip-coating and tunable diode laser irradiation (TDLI) technology and observing the extinction spectrum in real-time, without strictly controlling the particle size uniformity of metal NPs [ 58 ]. During this process, TDLI technology has been used to regulate the size of metal NPs [ 59 ].…”

Section: Fiber-lspr Refractive Index Sensorsmentioning

confidence: 99%

Preparation and Application of Metal Nanoparticals Elaborated Fiber Sensors

Haoru

et al. 2020

Sensors

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In recent years, surface plasmon resonance devices (SPR, or named plamonics) have attracted much more attention because of their great prospects in breaking through the optical diffraction limit and developing new photons and sensing devices. At the same time, the combination of SPR and optical fiber promotes the development of the compact micro-probes with high-performance and the integration of fiber and planar waveguide. Different from the long-range SPR of planar metal nano-films, the local-SPR (LSPR) effect can be excited by incident light on the surface of nano-scaled metal particles, resulting in local enhanced light field, i.e., optical hot spot. Metal nano-particles-modified optical fiber LSPR sensor has high sensitivity and compact structure, which can realize the real-time monitoring of physical parameters, environmental parameters (temperature, humidity), and biochemical molecules (pH value, gas-liquid concentration, protein molecules, viruses). In this paper, both fabrication and application of the metal nano-particles modified optical fiber LSPR sensor probe are reviewed, and its future development is predicted.

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