Split Mach–Zehnder interferometer for surface plasmon resonance based phase modulation

2017 ◽  
Vol 403 ◽  
pp. 55-61 ◽  
Author(s):  
Jayeta Banerjee ◽  
Mahua Bera ◽  
Mina Ray
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Phase Modulation ◽  
Zehnder Interferometer ◽  
Mach Zehnder Interferometer

scholarly journals Enhanced Mach-Zehnder Interferometer Multimode–Single-Mode–Multimode Fiber Optic Refractive Index Sensor Based on Surface Plasmon Resonance

2021 ◽  
Author(s):  
Zahra Akbarpour ◽  
Vahid Ahmadi ◽  
Farzaneh Arabpour Roghabadi
Keyword(s):  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
High Performance ◽  
Low Cost ◽  
Single Mode ◽  
Zehnder Interferometer ◽  
Refractive Index Sensor ◽  
Mach Zehnder Interferometer

In this paper, an all-fiber Mach-Zehnder interferometer (MZI) sensor for refractive index (RI) measuring is presented, which is based on Multimode–Single-mode–Multimode (MSM) fiber. The effects of both reducing the radius of the sensing part and the surface plasmon resonance (SPR) on its efficiency are investigated. Increasing the interaction of high-order modes with external media, caused by etching the cladding layer of the single-mode fiber part, significantly improves the sensitivity. Both wavelength and intensity interrogation approaches are employed to study the Multimode–etched Single-mode–Multimode (MESM) fiber sensor. The intensity and the wavelength sensitivities for the RI measurement in the range of 1.428-1.458 are obtained as -2308.92 %/RIU and 1313.14 nm/RIU, respectively. Finally, the MESM-SPR sensor is proposed and characterized. Results exhibit high performance in the RI range of 1.333 to 1.357, in which the sensitivity of 1433 nm/RIU is achieved. The advantages like low cost, high sensitivity, and simple fabrication methods make these sensors promising devices for chemical, food industry, and biosensing applications.

scholarly journals Surface Plasmon Resonance-Based Sensing Utilizing Spatial Phase Modulation in an Imaging Interferometer

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1616
Author(s):  
Roman Kaňok ◽  
Dalibor Ciprian ◽  
Petr Hlubina
Keyword(s):  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Detection Limit ◽  
Phase Shift ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Phase Modulation ◽  
Spatial Phase ◽  
Plasmonic Structure ◽  
Imaging Interferometer

Spatial phase modulation in an imaging interferometer is utilized in surface plasmon resonance (SPR) based sensing of liquid analytes. In the interferometer, a collimated light beam from a laser diode irradiating at 637.1 nm is passing through a polarizer and is reflected from a plasmonic structure of SF10/Cr/Au attached to a prism in the Kretschmann configuration. The beam passes through a combination of a Wollaston prism, a polarizer and a lens, and forms an interference pattern on a CCD sensor of a color camera. Interference patterns obtained for different liquid analytes are acquired and transferred to the computer for data processing. The sensing concept is based on the detection of a refractive index change, which is transformed via the SPR phenomenon into an interference fringe phase shift. By calculating the phase shift for the plasmonic structure of SF10/Cr/Au of known parameters we demonstrate that this technique can detect different weight concentrations of ethanol diluted in water, or equivalently, different changes in the refractive index. The sensitivity to the refractive index and the detection limit obtained are −278 rad/refractive-index-unit (RIU) and 3.6 × 10 − 6 RIU, respectively. The technique is demonstrated in experiments with the same liquid analytes as in the theory. Applying an original approach in retrieving the fringe phase shift, we revealed good agreement between experiment and theory, and the measured sensitivity to the refractive index and the detection limit reached −226 rad/RIU and 4.4 × 10 − 6 RIU, respectively. These results suggest that the SPR interferometer with the detection of a fringe phase shift is particularly useful in applications that require measuring refractive index changes with high sensitivity.

scholarly journals Optical Sensors based on Surface Plasmon Resonance

2020 ◽  
Vol 32 (12) ◽  
pp. 2953-2959
Author(s):  
Tan Tai Nguyen ◽  
Kieu Vo Thi Diem
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Optical Sensors ◽  
Plasmon Resonance ◽  
Phase Modulation ◽  
Wavelength Modulation ◽  
Sensing Technology ◽  
Transduction Signal ◽  
Detection Schemes ◽  
Modulation Wavelength

This brief review presents the recent process in optical sensors based on surface plasmon resonance (SPR). In particular, it will focus on the optical sensors that employ the change of refractive index as the sensing transduction signal. Various detection schemes of optical sensors which include phase modulation, wavelength modulation and intensity modulation are discussed. The performance advantageous and disadvantageous of the description of optical sensors structure and their respective experimental configurations are also described. The examples of detection in chemistry, biology and heavy metals will be presented. Future prospects of surface plasmon resonance (SPR) sensing technology is also discussed.

Comparison of sensitivity of the refractometric methods of frustrated total internal reflection and surface plasmon resonance

2020 ◽  
pp. 44-49
Author(s):  
I. N. Pavlov
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Total Internal Reflection ◽  
Resonance Method ◽  
Internal Reflection ◽  
Optical Methods ◽  
Thin Boundary Layer ◽  
Experimental Conditions ◽  
Frustrated Total Internal Reflection

Two optical methods, namely surface plasmon resonance imaging and frustrated total internal reflection, are described in the paper in terms of comparing their sensitivity to change of refractive index of a thin boundary layer of an investigated medium. It is shown that, despite the fact that the theoretically calculated sensitivity is higher for the frustrated total internal reflection method, and the fact that usually in practice the surface plasmon resonance method, on the contrary, is considered more sensitive, under the same experimental conditions both methods show a similar result.

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