Hafnium dioxide as a dielectric for highly-sensitive waveguide-coupled surface plasmon resonance sensors

Tiwari, Kunal; Sharma, S. C.; Hozhabri, N.

doi:10.1063/1.4948454

Cited by 14 publications

(4 citation statements)

References 25 publications

(34 reference statements)

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“…The surface plasmon resonance (SPR) sensor, as an important optical sensor, has been used in chemical and biochemical sensing, gases sensing, medical diagnostics, and food safety detection for years [ 1 , 2 , 3 ]. The rapid development of SPR sensor technology is owed to its distinctive features, such as label-free quantification, real-time analysis, and high sensitivity [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Figure of Merit Enhancement of a Surface Plasmon Resonance Sensor Using a Low-Refractive-Index Porous Silica Film

Meng

Zhao

Lin

et al. 2017

Sensors

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In this paper; the surface plasmon resonance (SPR) sensor with a porous silica film was studied. The effect of the thickness and porosity of the porous silica film on the performance of the sensor was analyzed. The results indicated that the figure of merit (FOM) of an SPR sensor can be enhanced by using a porous silica film with a low-refractive-index. Particularly; the FOM of an SPR sensor with 40 nm thick 90% porosity porous silica film; whose refractive index is 1.04 was improved by 311% when compared with that of a traditional SPR sensor. Furthermore; it was found that the decrease in the refractive index or the increase in the thickness of the low-refractive-index porous silica film can enlarge the FOM enhancement. It is believed that the proposed SPR sensor with a low-refractive-index porous silica film will be helpful for high-performance SPR sensors development.

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Section: Introductionmentioning

confidence: 99%

Figure of Merit Enhancement of a Surface Plasmon Resonance Sensor Using a Low-Refractive-Index Porous Silica Film

Meng

Zhao

Lin

et al. 2017

Sensors

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“…Figure 2 shows the schematic of our system used for simultaneous measurements of the surface plasmon resonance and electrical resistivity of the samples. Compared to the traditional Kretschmann configuration optical system [17][18][19][20], this system utilizes a recently developed fixed-detector Kretschmann configuration optical system for the SPR measurements. One of the advantages of the fixed-detector system is that it does not require the use of a (θ, 2θ) goniometer [21].…”

Section: Methodsmentioning

confidence: 99%

Controlling Electrical Conduction through Noble Metal Thin Films by Surface Plasmon Resonance

et al. 2020

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We have conducted in situ measurements of the surface plasmons and electrical resistivity of noble metal thin films. We present results for the electrical resistivity of these materials as functions of the angle of incidence for p-polarized light of wavelength λ = 632 nm in the Kretschmann configuration optical system. We observe a significantly lower resistivity (higher conductivity) under resonance conditions for the surface plasmon polaritons. The resistivity data are supported by COMSOL simulations of the evanescent fields associated with the surface plasmons. We discuss the resistivity data in terms of the theoretical models, which suggest that the electrical conductivity of the transition metals is sensitive to Umklapp electron-electron scattering and attractive interactions between free electrons because of the screening of the d-band electrons by the s-band electrons.

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“…Hafnium oxide is a transition metal oxide with a band gap energy of more than 5.0 eV and dielectric constant of more than 25 [1]. Because of its high mechanical and thermal stability, HfO 2 is widely used for protective coatings and waveguides [2,3]. Due to wide band gap and high refractive index, HfO 2 films have been employed in high reflectivity mirrors, anti-reflection coatings, filters and beam splitters [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Enhanced room temperature sensitivity of undoped HfO2 nanoparticles towards formaldehyde gas

Chattopadhyay

Nayak

2021

Appl. Phys. A

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Hafnium oxide (HfO 2 ) nanoparticulate powders were synthesized via a single step sol gel route using citric acid and ethylene glycol as chelating agent and polymerizing agent, respectively. In order to burn off the volatile components and produce crystalline HfO 2 nanoparticles, the powders were calcined at moderately high temperatures ranging from 500 to 800 °C for 1 h each. The crystal structures of the nanoparticles were ascertained by powder X-ray diffraction. The nanocrystals in powder form had monoclinic structure and preferred orientation of the nanocrystals along (−111) direction was evident. The morphologies of the HfO 2 nanopowders were studied by Field Emission Scanning Electron Microscope (FESEM). Morphologies of the nanopowder were observed to change with calcination temperatures. The optical properties of the HfO 2 nanoparticles were evaluated by UV-Vis Diffuse Reflectance Spectroscopy (DRS). A small change in the band gap energy of HfO 2 nanoparticles was observed with a change in the calcination temperature. In order to study the electrical and gas sensing properties of HfO 2 nanoparticles, the powders were pressed into pellets with 12.0 mm diameter and 1.5 mm thickness. Gas sensing properties of HfO 2 pellets were investigated by exposing them to formaldehyde gas inside closed chambers. The sensitivity of HfO 2 towards formaldehyde gas initially increased with an increase in the calcination temperature due to increased porosity and decreased resistance of the HfO 2 pellet. The HfO 2 powder calcined at 700 °C showed highest sensitivity of 91.2% towards 264 ppm formaldehyde gas. The sensitivity declined with further increase in the calcination temperature because the HfO 2 pellet became less porous thereby. Selectivity of the HfO 2 sensor was tested with three volatile organic compound gases: acetone, ethanol and formaldehyde. Highest response was recorded for the formaldehyde gas.

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Hafnium dioxide as a dielectric for highly-sensitive waveguide-coupled surface plasmon resonance sensors

Cited by 14 publications

References 25 publications

Figure of Merit Enhancement of a Surface Plasmon Resonance Sensor Using a Low-Refractive-Index Porous Silica Film

Figure of Merit Enhancement of a Surface Plasmon Resonance Sensor Using a Low-Refractive-Index Porous Silica Film

Controlling Electrical Conduction through Noble Metal Thin Films by Surface Plasmon Resonance

Enhanced room temperature sensitivity of undoped HfO2 nanoparticles towards formaldehyde gas

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