M. F. Mohamad Yusof and S. K. Ayop, “The trapping of a single chloroform microdroplet in water using optical tweezers,” no. June, p. 18, 2020, doi: 10.1117/12.2573528
M. F. Mohamad Yusof, S. K. Ayop, F. L. Supian, and Y. Juahir, “Optical trapping of organic solvents in the form of microdroplets in water,” Chem. Phys. Lett., vol. 749, no. April, p. 137407, 2020, doi: 10.1016/j.cplett.2020.137407.
M. S. M. Yeng, M. F. M. Yusof, and S. K. Ayop, “Thickness dependant effective radius of an optical trapping toward water-air interface,” Int. J. Innov. Technol. Explor. Eng., vol. 8, no. 8, pp. 91–93, 2019. [LINK]
M. F. Mohamad Yusof, M. Y. Hamid, and S. K. Ayop, “Calibration of Optical Tweezers Using Boltzmann Statistics Method,” in Optical Fiber Laser Technology. Series 2, A. H. Ali and Z. Zakaria, Eds. UTM Press, 2019, pp. 25–36.
A. N. Mat Daud, R. Jaafar, S. K. Ayop, and M. S. Rohani, “A computerized system based on an alternative pulse echo immersion technique for acoustic characterization of non-porous solid tissue mimicking materials,” Meas. Sci. Technol., vol. 29, no. 4, pp. 1–9, 2018, doi: 10.1088/1361-6501/aaa728.
M. S. M. Yeng, S. K. Ayop, and I. R. Mustapa, “Depth - Dependent Optical Stiffness Toward Water - Air Interface,” Int. J. Eng. Technol., vol. 7, no. 4.30, pp. 80–84, 2018.
F. M. Mohamad Yusof, M. S. Mat Yeng, and S. K. Ayop, “Axial Calibration of QPD Signal based on Stuck Bead Method for Optical Trapping Applications,” Int. J. Eng. Technol., vol. 7, no. 4.30, pp. 371–373, 2018.
M. Y. Hamid and S. K. Ayop, “LabVIEW-Based Software for Optical Stiffness Determination Using Boltzmann Statistics, Equipartition Theorem and Power Spectral Density Methods,” Adv. Sci. Lett., vol. 24, no. 3, pp. 1856–1860, 2018, doi: 10.1166/asl.2011.1261.
S. K. Ayop, “Working Principles of Optical Tweezers,” in Optical Fiber Laser Technology, A. H. Ali, N. A. Awang, and A. S. Ameruddin, Eds. Penerbit UTHM, 2018, pp. 105–116.
A. N. Mat Daud, R. Jaafar, S. K. Ayop, M. I. H. Yaacob, and M. S. Rohani, “Elastic constant determination of hardwoods using ultrasonic insertion technique,” Ultrasonics, vol. 75, pp. 194–198, 2017, doi: 10.1016/j.ultras.2016.11.025.
M. S. Mat Yeng, S. K. Ayop, and M. Y. Hamid, “The Determination of Laser Spot Size of an Optical Tweezers by Stuck Bead Method,” J. Sci. Technol., vol. 9, no. 3, pp. 70–74, 2017.
S. K. Ayop, W. N. S. W. Aziz, I. R. Mustapa, and Y. Munajat, “Microrheological measurement of microcrystalline cellulose solution using particle tracking,” J. Fundam. Appl. Sci., vol. 9, no. 5s, pp. 245–259, 2017.
W. N. S. Wan Aziz, S. K. Ayop, M. Y. Hamid, and Y. Munajat, “Simple Determination of the Stiffness of an Optical Trap Using Video Microscopy and Particle Tracking,” Bul. Opt., vol. 2, pp. 1–6, 2016.
M. Y. Hamid, S. K. Ayop, W. N. S. Wan Aziz, and Y. Munajat, “Spatial Distribution of an Optically Trapped Bead in Water,” Bul. Opt., vol. 2, pp. 1–8, 2016.
S. Riyanto, S. K. Ayop, and W. N. S. Wan Aziz, “The determination of complex shear modulus of deionized water using kramer-kronig relation (KKR) method,” J. Teknol., vol. 74, no. 8, pp. 49–54, 2015, doi: 10.11113/jt.v74.4723.
S. Riyanto, S. K. Ayop, A. Purwanto, and W. N. S. Wan Aziz, “Determination of Water Viscosity by Tracking The Brownian Motion of a Single Particle using Video Microscopy,” J. Sci. Math. Lett. UPSI, vol. 3, no. 1, pp. 1–6, 2015, [Online]. Available: https://ejournal.upsi.edu.my/issuedetails/270.
W. N. S. W. Aziz, S. K. Ayop, and S. Riyanto, “The potential of optical tweezer (OT) for viscoelastivity measurement of nanocellulose solution,” J. Teknol., vol. 74, no. 8, pp. 45–48, 2015, doi: 10.11113/jt.v74.4722.
W. N. S. Wan Aziz, S. K. Ayop, M. A. Amat, M. H. Hashim, and R. Jaafar, “The Development of Universal Mass Balance,” in Proceeding of International Conference On Research, Implementation And Education Of Mathematics And Sciences 2014, 2014, pp. P93–P98.
S. Riyanto, S. K. Ayop, and W. N. S. Wan Aziz, “Simulation on Power Spectrum Density (PSD) of an Optically Trapped Particle,” in Proceeding of International Conference On Research, Implementation And Education Of Mathematics And Sciences 2014, 2014, pp. P79–P86.
A. N. Mat Daud, S. K. Ayop, M. I. H. Yaacob, and R. Jaafar, “Computerized acoustical characterization system of medical phantoms,” in AIP Conference Proceedings, 2013, vol. 1528, pp. 406–411, doi: 10.1063/1.4803635.
S. K. Ayop, A. N. Mat Daud, M. H. Hashim, R. Jaafar, M. F. Asillam, and Z. K. D. Nurlisman, “Simple Design of a Gravity-Independent Mass Balance,” Appl. Mech. Mater., vol. 390, pp. 637–640, 2013, doi: 10.4028/www.scientific.net/AMM.390.637.
S. K. Ayop, W. N. S. Wan Aziz, M. H. Hashim, R. Jaafar, and M. I. H. Yaacob, “Mechanical efficiency of a mass-spring system in hypergravity, normal gravity and microgravity,” Appl. Mech. Mater., vol. 390, pp. 261–265, 2013, doi: 10.4028/www.scientific.net/AMM.390.261.
D. Chong Bor Wei, S. K. Ayop, and F. Kremer, “Resolvability Between Bare and DNA-Grafted Microsphere by Flow Resistance Measurement using Optical Tweezers,” J. Sci. Math. Lett. UPSI, vol. 1, pp. 28–34, 2013, [Online]. Available: https://ejournal.upsi.edu.my/issuedetails/268.
A. N. Mat Daud, S. K. Ayop, and R. Jaafar, “The Measurement of Acoustic Properties of Stepped-Shape Phantoms,” in Prosiding Kolokium Kebangsaan Pasca Siswazah Sains dan Matematik 2012, 2012, pp. 151–157.
S. K. Ayop, H. Fujiwara, and K. Sasaki, “Fano-like resonance in an optically driven atomic force microscope cantilever.,” Opt. Express, vol. 19, no. 3, pp. 2317–2324, 2011, doi: 10.1364/OE.19.002317.
S. K. Ayop, H. Fujiwara, and K. Sasaki, “Analysis of photothermally induced vibration in metal coated AFM cantilever,” in Proceedings of SPIE - The International Society for Optical Engineering, 2010, vol. 7743, doi: 10.1117/12.861053.
S. K. Ayop, H. Fujiwara, and K. Sasaki, “Photo-induced forces on AFM cantilever by externally modulated laser,” in Proceedings of SPIE - The International Society for Optical Engineering, 2009, vol. 7508, doi: 10.1117/12.839932.
S. K. Ayop, H. Fujiwara, and K. Sasaki, “Fano-like resonance in an optically driven atomic force microscope cantilever,” Virtual J. Biomed. Otpics, vol. 6, no. 2, 2011, doi: 10.1364/OE.19.002317.
M. M. Abd Karim, A. K. Ariffin, B. H. Hussain, S. K. Ayop, and Z. Ibrahim, “Dilatometric Analysis of Stannous Silicate Glasses,” J. Solid St. Sc. Technol. Lett., vol. 10, no. 1, pp. 77–82, 2003.
M. R. Sudin, R. Jaafar, and S. K. Ayop, “Penentuan Takat Awan Minyak Kelapa Sawit Dengan Kaedah Sel Uji Tetangga Ultrasonik,” J. Solid St. Sc. Technol. Lett., vol. 10, no. 2, pp. 42–48, 2003.