Abstract
As a promising optical method used in a variety of applications surface plasmon resonance (SPR) sensors are employed over a wide range of boundaries. This research proposes a highly sensitive SPR based sensor with a novel hybrid structure using transition metal dichalcogenides (e.g. WSe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , PtSe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) along with black phosphorene (BP) through comprehensive numerical study. To analyze and evaluate the performances of the proposed sensor, the widely used transfer matrix method (TMM) was used. The performances of the sensor were measured in terms of reflectivity, sensitivity, detection accuracy (DA), and figure of merit (FOM). The sensor structure was optimized by changing different structural parameters of the hybrid architecture to obtain better performances. The results revealed that insertion of PtSe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> with WSe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> and BP over a gold layer of the conventional structure improved the performance of the sensor and the maximum sensitivity of the sensor was measured as 200 deg/RIU with a FOM of 17.70 RIU <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−1</sup> . As well, the light penetration through the optimized sensor is investigated using the finite element method (FEM) based software. With this kind of high sensing capabilities, it may be convinced that the proposed sensor can be applied in different fields of biosensing to detect liquid biological and biochemical samples or analytes.
Highlights
Nowadays, as a highly promising optical technique different structures based surface plasmon resonance (SPR) have been reported to be used in the detection of samples for chemical, biochemical, biological, environmental, and medical applications
A hybrid model of Kretschmann configuration based sensor formation utilizing 2D materials e.g., PtSe2, WSe2, black phosphorene (BP) has been theoretically explored in this paper by using the transfer matrix method
The performances of the proposed sensor have been investigated by altering the structural parameters e.g., the thickness of PtSe2, WSe2, BP applied over the plasmonic metal substrate
Summary
As a highly promising optical technique different structures based surface plasmon resonance (SPR) have been reported to be used in the detection of samples for chemical, biochemical, biological, environmental, and medical applications. The sensors avoid the time-swallowing labeling process for molecular binding and provide real-time monitoring and analyzing capability of analytes of the sensing medium [1, 2] Various optical techniques, such as sensors based on Ramman scattering [3], planner waveguide [4], prism coupler [5], grating coupler [6], and optical fiber [7], have been reported as of for the sensing applications. Single-layer PtSe2 has a similar forming pattern to graphene, but it has excellent optical and electrical properties that are taken into great consideration as a 2D product beyond the ancestor members [12] It has intrinsic quantum confinement effect and potential interlayer interaction with profoundly harmonic band gap. The finite element method (FEM) based software is used to assess light penetration through the proposed sensor
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