Paper review for ammonia

1. List of Paper
Reviews
 1. Overview of Recent Advances in the Design of
Plasmonic Fiber-Optic Biosensors. (2020) – MDPI
Publication
 2. Review of No-coreOptical Fiber Sensor and
Applications (2020) – Elsevier
 3.Tapered Optical Fibre Sensors: CurrentTrends and
Future Perspectives(2019) - MDPI Publication
 4.A Review of Optical InterferometryTechniques for
VOC Detection (2019) - Elsevier

2. Overview of
RecentAdvances
in the
Design of
Plasmonic Fiber-
Optic Biosensors.
(2020)
Duration : (17 Days)
Received: 24 June 2020;
Accepted: 8 July 2020;
Published: 9 July 2020;
Category : Biosensors
Total pages: 22
Objective (s):
Overview the key plasmonic fiber-optic
biosensing design concepts, including
geometries based on (1) conventional optical
fibers like unclad, side-polished, tapered, and U-
shaped fiber designs, and geometries based on
(2) specialty optical fibers, such as photonic
crystal fibers and tilted fiber Bragg gratings.

3. Overview of
RecentAdvances
in the
Design of
Plasmonic Fiber-
Optic Biosensors.
(2020)
Specialty optical fibers
- Photonic crystal fibers (PCFs)
• D-Shaped PCF-Based.
• H-Shaped PCFs
• PCF-based biosensor with semi-
circular channels
- Tilted Fiber Bragg Gratings
Conventional optical fibers
-Unclad (cladding removal)
-side-polished
-Tapered
- U-shaped fiber designs

4. Overview of
Recent
Advances in the
Design of
Plasmonic Fiber-
Optic
Biosensors.
(2020)
two major limitations of the conventional optical fibers
First, the index of refraction deviations of the core and
cladding are restricted due to a limited fiber geometry.
Second, one cannot use a low index/high index material in the
core/cladding of the optical fiber due to a breakdown of total
internal reflection guiding mechanism.
Therefore, plasmonic fiber-optic biosensors based on
specialty optical fibers have been proposed and investigated in
the literature as alternatives to conventional optical fiber-
based biosensors with more flexibility in terms of the design
and characteristics.
Advantage of speciality optical fibers

5. Review of No-
coreOptical
FiberSensor and
Applications
(2020)
Duration : (3 months)
Received: 25 March 2020;
Accepted: 21 May 2020;
Published: 10 June 2020;
Category : Sensors and Actuators: A. Physical (2020)
Total pages: 33
Objective (s):
An overview of the NCF-based sensing
applications is spread out with
specific emphasis on :
 measurement methods,
 structural improvements
 combination of sensitive materials

6. Review of No-
coreOptical
FiberSensor
and
Applications
(2020)
Highlights:
1. The single NCF-based sensors with different analysis principles, and
the advantages of structural improvement including fiber taper,
lateral-offset fusing and internal waveguide writing.
2. the cascading of NCF with fiber gratings or other structures to realize
multiparameter measurement and widen the application field.
3. NCF combines sensitive materials to measure physical/chemical
parameters or coats metal film to excite surface plasmon resonance,
and representative examples of the latest research progress are
presented to confirm the potential value of NCF-based sensors in
biosensing
4. The sensing characteristics of applying NCF structure in different ways.

7. Review of No-
coreOptical
FiberSensor
and
Applications
(2020)
Advantages of NCF:
 The NCF can directly contact to external environment
due to the structural characteristic of only having the
cladding, so simply fusing a section of NCF between
single mode fiber (SMF) or MMF can form high
sensitivity sensors.
 NCF can be used as:
o MMI sensor
o Evanescent wave sensor
o Speckle-gram sensors
o Bandpass filter sensors
o Reflection-type sensors
Sensors of single NCF

8. Review of No-
coreOptical
FiberSensor
and
Applications
(2020)
The sensing application of NCF can be further extended and realized
multi-parameter measurement by
1. Cascading NCF with FBG
2. Cascaded two NCFs with different diameters
3. Cascading NCFs with different lengths
4. Cascaded SNS and SMS fiber structure
5. Multi-cladding fiber
6. NCF and waist-enlarged taper SMF
Cascading NCF with other fiber structures

9. Review of No-
coreOptical
FiberSensor
and
Applications
(2020)
1.The NCF-based sensing structure can be encapsulated in tube and
filled with magnetic fluid (MF) or RI matching liquid to achieve high
sensitivity magnetic field and dual-parameter measurement.
2. SPR can be excited to improve the measurement sensitivity by
plating metal film on the surface of NCF.
3. NCF can be the carrier of many kinds of sensitive materials for
biochemical sensing.
Sensors of combining NCF with sensitive materials or
metal film

10. Tapered
OpticalFibre
Sensors:
Current
Trendsand
Future
Perspectives
Objectives:
1)This review focuses on the use of tapered optical fibers as
an environmental sensing platform.
2) A review of the basic sensing platforms implemented using
tapered optical fibers and their application for development
of fibre-optic physical, chemical and bio-sensors is presented.
Duration : (30++ Days)
Received: 8 April 2019;
Accepted: 6 May 2019;
Published: 17 May 2019
Category : sensors
Total pages: 39

11. Highlighted:
1. Fabrication ofTapered Optical Fibers - achieved by heating a short section
of the fibre while simultaneously pulling the two ends of the fibre.
2. The method of Tapered Optical Fibre Sensors to measure the change
associated with the interaction between the EW and the medium of
interest :
I. Exploits detection of the light losses within the tapered
region, which can be caused by both the change in spectral
properties of the analyte and RI of the surrounding medium.
II. The second method utilizes interferometric method in which
the change of the effective refractive indices of the modes
propagating through the taper, is measured by using mode
coupling devices such as in-fibre gratings, surface plasmon
resonances and lossy mode resonances.
Example : Evanescent Wave Spectroscopy/ Radiation Losses and
Scattering/ Modal Interferometry/ Gratings in Tapered Optical
Fibers/ Surface Plasmon Resonance
Tapered
OpticalFibre
Sensors:
CurrentTrends
andFuture
Perspectives

12. ApplicationsofTaperedOpticalFibreSensors:
1. Refractometry—SingleTaper Devices
2. Grating AssistedTaper Devices
3. Refractometry—Multi-Taper Devices
4. Biochemical sensor
I. Fluorescent Sensors
II. Particle Detection
5. CoatedTapered Devices
I. Surface Plasmon Resonance (SPR)
II. Functional Coatings
6. Physical Sensors
I. Strain, Stress and Pressure
II. Temperature
III. Simultaneous Measurements ofTwo or More Parameters
Tapered
OpticalFibre
Sensors:
Current
Trendsand
Future
Perspectives

13. Objective
 This review assesses the different approaches adopted in
detectingVOCs.
 Different interferometry arrangements including the Fabry-
Perot interferometry, Sagnac interferometry and Mach-
Zehnder interferometry are reviewed for VOC detection,
including the different sensing films and materials employed.
 The basis of each technique, applications and limitations are
presented
 The different interferometry techniques are summarized by
comparing the sensitivity, limit of detection, linearity
response time and the challenges of current interferometry
techniques.
 A high-sensitive and multiplex interferometric sensors based on
the recent technology are suggested.
AReviewof
Optical
Interferometry
Techniquesfor
VOC Detection
Received Date: 17 January
2019
Revised Date: 4 November
2019
Accepted Date: 4 December
2019

14. configurationsforinterferometry
1. Fabry-Perot,
2. Sagnac,
3. Mach-Zehnder
4. Pohl interferometers.
AReviewof
Optical
Interferometry
Techniquesfor
VOC Detection
Interferometry for VOC detection
Use of Sensing film :
I. PDMS sensitive thin film.
II. Zeolite thin film
III. polymethyl-methacrylate (PMMA)
IV. polychloro-para-xylylene (Parylene-C),
V. SU-8, polyethylene glycol (PEG 400), PEG-1000,
VI. Norland optical adhesive (NOA 81)

15. ListofApplicationofInterferometryforVOCdetection
1. FP gas sensor was developed by Liu et al. using a metal-coated
FP cavity for detection of VOCs such as hexanol, methanol and
acetone.
2. Zeolite coated FP interferometer for 2-propanol and
formaldehyde detection.
3. Extrinsic FP interferometer made by a micro air-cavity in PDMS.
(Kacik et al.)
4. PMMA (Polymethyl methacrylate) functionalized FP
interferometer was developed byYu et al.
5. A Sagnac interferometer functionalized with PDMS was
designed by Wu et al for detection of 2- propanol
6. A chip-sizeVOCs sensor was developed by Reddy et al. using FP
array inside a μGC microfluidic channel.
7. Novel on-chipVOCs sensor was demonstrated by St-Gelais et
al. [113] using deformable silicon FP interferometer
AReviewof
Optical
Interferometry
Techniquesfor
VOC Detection

16. Existing challenges of the sensors
1. Sensing film – the sensitivity will depends on numerous factors
such as
I. polarity of the gas and sensing film, the volatility of the analyte, the
presence of functional groups, the gas molecular weight and size.
II. Uniformity, surface roughness, thickness, thermal stability and
development process of the sensing film also affect the response of
film-mediated sensors.
2. Slow time response
3. Temperature and humidity influences
4. Nonlinear output
5. Data acquisition and analysis
AReviewof
Optical
Interferometry
Techniquesfor
VOC Detection