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1

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Integrating Vernier spectrum with Fano resonance for high sensitivity of an all-optical sensor

Hairol Aman, Mohammad Amirul ; Ahmad Noorden, Ahmad Fakhrurrazi ; Ahmad Fajri, Faris Azim ; [et al.]

Springer Science and Business Media LLC ; 2022

In: Journal of Computational Electronics

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In: Journal of Computational Electronics, Springer Science and Business Media LLC

Type of Medium: Online Resource

ISSN: 1569-8025 , 1572-8137

URL: Article

DOI: 10.1007/s10825-022-01946-1

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2022

detail.hit.zdb_id: 2065612-9

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2

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Single-Mode Modified Tapered Fiber Structure Functionalized With GO-PVA Composite Layer for Relative Humidity Sensing

Syuhada, Aneez ; Shamsudin, Muhammad Salleh ; Daud, Suzairi ; [et al.]

Springer Science and Business Media LLC ; 2021

In: Photonic Sensors Vol. 11, No. 3 ( 2021-09), p. 314-324

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In: Photonic Sensors, Springer Science and Business Media LLC, Vol. 11, No. 3 ( 2021-09), p. 314-324

Abstract: A sensitive tapered optical fiber sensor incorporating graphene oxide (GO) and polyvinyl alcohol (PVA) composite film for the rapid measurement of changes in relative humidity was proposed and experimentally demonstrated. The sensing principle was based on the intensity modulation of the transmitted light induced by the refractive index changes of the sensitive coatings. The sensing region was obtained by tapering a section of single-mode optical fiber (SMF) from its original 125 µm diameter down to 9.03 µm. The tapered structure was then modified through deposition of GO/PVA nanocomposites by using the dip-coating technique. The field emission scanning electron microscope (FESEM) and Raman spectroscopy were used to characterize the structure of the composite film. As evidenced by a Fourier transform infrared spectroscopy (FTIR) analysis, the presence of oxygen functional groups (such as −OH and COOH) on the GO structure enabled the attachment of PVA molecules through hydrogen bonding and strong adhesion between GO/PVA layers. The performance of the sensor was tested over a wide range (20%RH to 99.9%RH) of relative humidity. The sensor showed a good response with its signal increasing linearly with the surrounding humidity. The tapered optical fiber sensor with the coating of GO/0.3g PVA achieved the highest sensitivity [0.5290RH (%)]. The stability, repeatability, reversibility, as well as response time of the designated sensor were also measured and analyzed.

Type of Medium: Online Resource

ISSN: 1674-9251 , 2190-7439

URL: Article

DOI: 10.1007/s13320-020-0595-0

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2021

detail.hit.zdb_id: 2577939-4

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3

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Z-TRANSFORM METHOD FOR OPTIMIZATION OF ADD-DROP CONFIGURATION SYSTEM

Daud, Suzairi ; Tufail Chaudary, Kashif ; Bahadoran, Mahdi ; [et al.]

Penerbit UTM Press ; 2015

In: Jurnal Teknologi Vol. 74, No. 8 ( 2015-06-03)

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In: Jurnal Teknologi, Penerbit UTM Press, Vol. 74, No. 8 ( 2015-06-03)

Abstract: This paper presents the new approaches of optimization the add-drop configuration system by using Z-transform method. Dark soliton was chosen as the input signal and Gaussian beam was chosen as the control signal for the model proposed. The incident light was said to achieve the maximum resonance with the ring resonator when the phase shift, . The derivation, analyzation, and optimization of the system are typically very important especially for the communication technology.

Type of Medium: Online Resource

ISSN: 2180-3722 , 0127-9696

URL: Article

DOI: 10.11113/jt.v74.4737

Language: Unknown

Publisher: Penerbit UTM Press

Publication Date: 2015

detail.hit.zdb_id: 2780014-3

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4

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FABRICATION OF CARBON THIN FILMS BY PULSED LASER DEPOSITION IN DIFFERENT AMBIENT ENVIRONMENTS

Abd Mubin, Mohamad Helmi ; Roslan, Muhammad Sufi ; Haider Rizvi, Syed Zuhaib ; [et al.]

Penerbit UTM Press ; 2016

In: Jurnal Teknologi Vol. 78, No. 3 ( 2016-02-21)

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In: Jurnal Teknologi, Penerbit UTM Press, Vol. 78, No. 3 ( 2016-02-21)

Abstract: In this work, carbon thin films are grown in different background environments (Air, Helium and Argon) at different pressures (60, 160, 500 and 1000 mbar) by ablating the graphite target with Nd:YAG laser of wavelength of 1064 nm, pulse energy of 740 mJ and pulse rate of 6 ns. 10,000 laser shots are used to ablate graphite target under different ambient conditions. Grown thin films are analyzed by Atomic Force Microscopy (AFM) to measure thickness, roughness average, maximum profile peak height, average maximum height of profile and spacing ratio of the surface. The obtained results show that the roughness average, thickness of film, maximum profile peak height, average maximum height of profile and spacing ratio of thin films decreases with increase in ambient pressuresand shows highest value at low pressure (160 mbar) in helium environment as compared with air and argon.

Type of Medium: Online Resource

ISSN: 2180-3722 , 0127-9696

URL: Article

DOI: 10.11113/jt.v78.7506

Language: Unknown

Publisher: Penerbit UTM Press

Publication Date: 2016

detail.hit.zdb_id: 2780014-3

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5

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SENSITIVITY MEASUREMENT OF FIBRE BRAGG GRATING SENSOR

Daud, Suzairi ; Abd Aziz, Muhammad Safwan ; Chaudhary, Kashif Tufail ; [et al.]

Penerbit UTM Press ; 2016

In: Jurnal Teknologi Vol. 78, No. 3 ( 2016-02-21)

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In: Jurnal Teknologi, Penerbit UTM Press, Vol. 78, No. 3 ( 2016-02-21)

Abstract: A practical pass-through type fibre Bragg grating (FBG) temperature sensor system have been designed, developed, simulated, and experimentally investigated. The performance of FBG was evaluated in harsh environments exposed under direct sunlight, rain, and wind. The sensor system designed directly focused with convex and hand lens. The temperature of FBG’s sensor head been measured. The broadband laser source was launched into the system using tunable laser source (TLS) and both transmission and reflection spectra of FBG sensor were measured by optical spectrum analyzer (OSA). Results shows that the Bragg wavelength shift, increased proportionally with the temperature changes. The sensitivity of FBG were recorded at 0.0100 and 0.0132 nm °C-1 for the systems where convex and hand lens applied to the FBG’s sensor head respectively, while the sensitivity of 0.0118 nm °C-1 measured for the system without any focusing element applied.

Type of Medium: Online Resource

ISSN: 2180-3722 , 0127-9696

URL: Article

DOI: 10.11113/jt.v78.7533

Language: Unknown

Publisher: Penerbit UTM Press

Publication Date: 2016

detail.hit.zdb_id: 2780014-3

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6

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Surrounding refractive index and liquid based sensors using fibre bragg grating

Shuhada Tan Halid, Nurul ; Daud, Suzairi ; Nur Aizatti Rohizad, Siti ; [et al.]

IOP Publishing ; 2020

In: Journal of Physics: Conference Series Vol. 1484, No. 1 ( 2020-04-01), p. 012009-

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In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1484, No. 1 ( 2020-04-01), p. 012009-

Abstract: Fiber Bragg grating (FBG) becomes one of the favourable sensing elements in current technology. In this study, FBG was chosen as the temperature sensor to validate the performance in different liquid samples and surrounding refractive index (SRI). FBG was chosen for the purpose due to its super sensitive sensor, low in cost, minimal of data loss, and other outstanding advantages. The experiment was done in difference sample of liquids, SRI, and condition. The sensitivity of FBG in air, water, and stingless bee honey were recorded at 10.6892 nm/°C, 10.6247 nm/°C, and 13.3985 nm/°C respectively.It shows that FBG is suit as a temperature sensor in different medium and SRI.

Type of Medium: Online Resource

ISSN: 1742-6588 , 1742-6596

URL: Article

DOI: 10.1088/1742-6596/1484/1/012009

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2020

detail.hit.zdb_id: 2166409-2

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7

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Dopant concentrations analysis on electro-optic performances of gallium nitride-based ultraviolet light-emitting diode chip

Nazmi, Ahmad Nadzimuddin ; Hairol Aman, Mohammad Amirul ; Ahmad Fajri, Faris Azim ; [et al.]

SPIE-Intl Soc Optical Eng ; 2023

In: Optical Engineering Vol. 62, No. 07 ( 2023-7-26)

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In: Optical Engineering, SPIE-Intl Soc Optical Eng, Vol. 62, No. 07 ( 2023-7-26)

Type of Medium: Online Resource

ISSN: 0091-3286

URL: Article

DOI: 10.1117/1.OE.62.7.077104

Language: Unknown

Publisher: SPIE-Intl Soc Optical Eng

Publication Date: 2023

detail.hit.zdb_id: 2010512-5

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8

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Optimizing the efficiency of gallium nitride‐based light‐emitting diodes from contact area of current spreading to electrode

Shaari, Adam ; Ahmad Fajri, Faris Azim ; Ahmad Noorden, Ahmad Fakhrurrazi ; [et al.]

Wiley ; 2021

In: Microwave and Optical Technology Letters Vol. 63, No. 3 ( 2021-03), p. 970-974

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In: Microwave and Optical Technology Letters, Wiley, Vol. 63, No. 3 ( 2021-03), p. 970-974

Abstract: A nonuniform current spreading in the current spreader layer greatly reduced the internal quantum efficiency (IQE) of the light‐emitting diodes (LED). The effects of the current spreading layer on the electrode contact area toward the IQE in a vertical design of gallium nitride (GaN)‐based LED chip is analytically analyzed. The contact area was varied by changing the value of the electrode's width from 2 to 12 μm. Efficiency droop and current density at peak IQE are analyzed based on contact area. The width of 2 μm requires 1 . 6 μAm −2 current density to achieve peak efficiency and produces a droop of 0.2150. The width of 12 μm requires 9 . 6 μAm −2 current density to achieve peak efficiency and produces 0.0557 droop. The increase in contact area increases the current density needed to achieve peak IQE while decreases efficiency droop. The optimal spreader contact width of this vertical LED design is 6 μm.

Type of Medium: Online Resource

ISSN: 0895-2477 , 1098-2760

URL: Issue

URL: Article

DOI: 10.1002/mop.v63.3

DOI: 10.1002/mop.32698

Language: English

Publisher: Wiley

Publication Date: 2021

detail.hit.zdb_id: 2000574-X

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9

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Non-contact salinity measurement using a bifurcated fiber bundle sensing

Johari, Abdul Rahman ; Abdullah, Mundzir ; Singaravadivelan, Raj Kumar ; [et al.]

IOP Publishing ; 2023

In: Journal of Physics: Conference Series Vol. 2432, No. 1 ( 2023-02-01), p. 012010-

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In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2432, No. 1 ( 2023-02-01), p. 012010-

Abstract: A non-contact salinity sensor using a bifurcated fiber bundle sensing is proposed. The sensor was operated based on intensity modulation due to the variation of displacement between the tip of the probe with the surface of the sample. The light that reflected back into the receiving fiber bundle is analysed and correlation with the salinity of the samples has been performed. This allows the performance of the sensor towards salinity to be quantified based on the front slope, back slope and peak intensity. The proposed configuration has been calibrated and then experimentally validated. The calibration curve can be plotted based on three parameters: peak intensity, front slope and back slope. The peak intensity curve exhibits the highest sensitivity of 1.52×10 5 a.u./M with the resolution of 4.2×10 -2 M. The ubiquitousness of sensor configuration and non-contact measurement make the proposed sensor a viable alternative to standard commercial devices.

Type of Medium: Online Resource

ISSN: 1742-6588 , 1742-6596

URL: Article

DOI: 10.1088/1742-6596/2432/1/012010

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2023

detail.hit.zdb_id: 2166409-2

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10

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ARC DISCHARGE SYNTHESIS OF CNTS IN HYDROGEN ENVIRONMENT IN PRESENCE OF MAGNETIC FIELD

Roslan, Muhammad Sufi ; Chaudary, Kashif ; Haider Rizvi, Syed Zuhaib ; [et al.]

Penerbit UTM Press ; 2016

In: Jurnal Teknologi Vol. 78, No. 3 ( 2016-02-21)

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In: Jurnal Teknologi, Penerbit UTM Press, Vol. 78, No. 3 ( 2016-02-21)

Abstract: In this study the effect of hydrogen ambient environment on the growth of carbon nanotubes by arc discharge plasma in presence of external magnetic field is investigated. The samples collected from cathode deposit are analyzed by field emission scanning electron microscopy and Raman spectroscopy. Results show an increase in carbon nanotube growth with increase in hydrogen ambient pressure. The magnetic field considerably enhances the growth of carbon nanotube as observed in FESEM micrographs. In Raman spectrum, high intensity of G peak as compared to D peak indicates the presence of high quality nanotubes. Magnetic effect remarkably decreases ID/IG ratio from 1.55 to 0.31 for ambient pressure 10 mbar.

Type of Medium: Online Resource

ISSN: 2180-3722 , 0127-9696

URL: Article

DOI: 10.11113/jt.v78.7528

Language: Unknown

Publisher: Penerbit UTM Press

Publication Date: 2016

detail.hit.zdb_id: 2780014-3

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Kooperativer Bibliotheksverbund

Berlin Brandenburg