Kaushik Brahmachari

Performance of admittance loci based design of plasmonic sensor at infrared wavelength

Abstract. A Kretschmann-Raether prism-based three-layer structure consisting of a prism, gold (Au) metal film, and dielectric sample has been investigated with the use of admittance loci method in attenuated total internal reflection mode. High index prism materials like silicon, chalcogenide (2S2G), and SF14 have been used to study their effect on surface plasmon resonance (SPR) sensing (at 1200-nm wavelength) in infrared region by corresponding admittance loci plots and also by SPR sensing curves. The performance of the sensor based on the choice of the prism material has been discussed with the help of sensitivity plots giving due importance to the dynamic range of the designed sensor.

Performance analysis of a plasmonic sensor based on gold nanoparticle film in infrared light using the admittance loci method

A theoretical design of surface plasmon resonance (SPR) structure operating in attenuated total reflection (ATR) mode and comprising of silicon or chalcogenide (2S2G) prism material coated with gold film having different nanoparticle sizes has been reported along with some interesting performance related simulation results at the operating wavelength of 1200 nm in infrared. The admittance loci based technique has been employed for the appropriate choice of the metal layer thickness. The sensitivity and other performance parameters of the structure based on the choice of the high index prism material and correct gold nanoparticle size have also been presented. In comparison to other conventional prism based plasmonic structures, the proposed model provides the extra degree of freedom, i.e., variations of nanoparticle size in addition to the variation in layer thickness and the use of different high index prism materials like silicon, 2S2G materials, etc. Moreover, the width of the SPR curve can be controll...

Admittance Loci Based Design of a Plasmonic Structure Using Ag-Au Bimetallic Alloy Film

A theoretical study based on the use of admittance loci method in the design of surface plasmon resonance (SPR) based structure using Ag-Au bimetallic alloy film of different alloy fractions and nanoparticle sizes has been reported along with some interesting performance related simulated results at 633 nm wavelength. The sensitivity and other performance parameter issues of the structure based on the choice of correct alloy fraction and nanoparticle size of Ag-Au bimetallic alloy film have also been discussed giving due importance to the dynamic range of the designed structure.

Admittance Loci Based Design of Plasmonic Sensor Working in Wavelength Interrogation Regime

A prism coupler based plasmonic sensor consisting of a prism, gold (Au) metal film and dielectric sample has been investigated with the use of admittance loci method in wavelength interrogation mode. Prism materials namely fused silica, chalcogenide (2S2G) and silicon have been used to study their effect on surface plasmon sensing in wavelength interrogation mode by admittance loci plots and by corresponding surface plasmon sensing curves. The performance of the plasmonic sensor under wavelength interrogation mode based on the choice of the prism material has been discussed and validated by the dynamic range and sensitivity plots.

Performance evaluation of admittance loci based design of a ceramic prism based plasmonic structure

A theoretical study based on the use of admittance loci method in design of a plasmonic structure using transparent ceramic prism material and some other types of prism materials has been reported in this paper. A Kretschmann-Raether type prism-based plasmonic structure consisting of a prism, gold (Au) metal film and dielectric sample has been investigated with the use of admittance loci method in Attenuated Total Internal Reflection (ATIR) mode. High refractive index of ceramic material along with high detection accuracy offers certain advantages for sensing applications. Admittance loci plots, surface plasmon sensing curves along with surface plasmon resonance angle, angular shift and detection accuracy plots using transparent ceramic prism material has been compared with those for other types of prism materials in order to study their effects on surface plasmon sensing at 670 nm wavelength.

Performance enhancement of a plasmonic structure comprising of indium oxide–zirconium dioxide–silver–zinc oxide intermediate layers working in visible and infrared wavelength region

Abstract. Modeling of a fused silica (SiO2) glass prism-based plasmonic structure comprising of indium oxide (In2O3)–zirconium dioxide (ZrO2)–silver (Ag)–zinc oxide (ZnO) intermediate layers showing enhancement in sensitivity and figure-of-merit (FOM) in visible and infrared regime has been reported in this paper. Performance of the proposed plasmonic structure has been demonstrated in terms of sensitivity, half width (HW), detection accuracy (DA), and FOM parameters in visible (632.8 nm) and infrared (1200 nm) wavelength of light. High sensitivity of fused silica glass material, In2O3, ZnO films along with high DA and high FOM of Ag and inclusion of ZrO2 as an oxidation protective layer in between In2O3 and Ag have been the most exciting and advantageous features of our proposed structure. Simulated sensitivity values of our proposed structure were found to be 73.8  deg/RIU at 632.8 nm wavelength and it was found enhanced to 109.6  deg/RIU at 1200 nm wavelength and simulated FOM values were also found enhanced from 23.3544  RIU−1 at 632.8 nm to 62.6285  RIU−1 at 1200 nm wavelength for change in sensing layer refractive indices from 1.30 RIU to 1.35 RIU.

Modeling and performance analysis of chalcogenide prism based plasmonic biosensor comprising of gold nanoparticle film

In this work, admittance loci method is used to model and analyze performance of a chalcogenide prism based plasmonic biosensor comprising of gold metal nanoparticle film for detection of wavelength dependent refractive index change of human blood sample under angular interrogation mode. The wavelength dependent performance of the plasmonic biosensor based on the choice of chalcogenide (2S2G) as a coupling prism material has been discussed with the help of performance parameter plots.

Influence of chalcogenide glass on surface plasmon resonance based sensor design in near infrared region using admittance loci method

A numerical simulation study based on the use of admittance loci method in design of surface plasmon resonance (SPR) based sensor using chalcogenide and other commonly used glasses has been reported in this paper. A simple Kretschmann-Raether prism-based multilayer structure consisting of a glass prism, Gold (Au) metal film and water (sensing layer) has been investigated with the use of admittance loci method in Attenuated Total Internal Reflection (ATIR) mode. Infrared transmission properties of chalcogenide material along with high refractive index offer certain advantages for sensing applications. Admittance loci plots as well as resonance curves using chalcogenide glass has been compared with those for other commonly used glasses in order to study their effect on SPR sensing in near infrared (NIR) wavelength region.