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Academic Staff member

Dr. H. A. D. Saranga Dilruk Perera

Senior Lecturer(Grade I)

CONTACT INFORMATION
Full Name: Dr. H.A.D. Saranga Dilruk Perera
Current Position: Senior Lecturer (Grade I with effect from 23/12/2018)
Address: Department of Physics, University of Ruhuna, Matara.
Home Address: 69/4, Mangala road, Meddawatta, Matara.
Phones: Mobile: 071-909-1183
E-mail: pererasd@gmail.com; pererasd@phy.ruh.ac.lk

EDUCATION
•Ph.D., University of Cincinnati, Cincinnati, Ohio (Fall 2012)
Major Concentration: Experimental Condensed Matter Physics
Ph.D. Thesis: Investigation of exciton dynamics and electronic band structure of InP and GaAs nanowires.
Thesis Advisor: Prof. Leigh M. Smith
•B.Sc. Special Degree in Physics (First Class Honors), University of Ruhuna, Matara, Sir Lanka (1998 – 2002)
Major: Physics
Minor: Computer Science

Email - pererasd@phy.ruh.ac.lk
Office - +94412222682/


  • 2012/2013
  • Level I: Wave Motion and Acoustics Mechanical Systems (PHY 1114)
  • Level I: Geometrical and Physical Optics (PHY 1214)
  • Level I: Senior Lecturer In-charge of first year practical classes PHY1b22
  • Level III: Statistical Physics PHY3114
  • Level II (Special Degree): Lecturer In-charge of Special Degree practical classes PHY4071
  • 2013/2014
  • Level I: Wave Motion and Acoustics Mechanical Systems (PHY 1114)
  • Level I: Geometrical and Physical Optics (PHY 1214)
  • Level I: Senior Lecturer In-charge of first year practical classes PHY1b22
  • Level III: Statistical Physics PHY3114
  • Level II (Special Degree): Lecturer In-charge of Special Degree practical classes PHY4071
  • 2014/2015 Level I: Wave Motion and Acoustics Mechanical Systems (PHY 1114)
  • Level I: Geometrical and Physical Optics (PHY 1214)
  • Level I: Senior Lecturer In-charge of first year practical classes PHY1b22
  • Level III: Statistical Physics PHY3114
  • Level II (Special Degree): Lecturer In-charge of Special Degree practical classes PHY4071
  • 2015/2016 Level I: Wave Motion and Acoustics Mechanical Systems (PHY 1114)
  • Level I: Geometrical and Physical Optics (PHY 1214)
  • Level I: Senior Lecturer In-charge of first year practical classes PHY1b22
  • Level III: Statistical Physics PHY3114
  • Level II (Special Degree): Lecturer In-charge of Special Degree practical classes PHY4071
  • 2016/2017
  • Level I: Wave Motion and Acoustics Mechanical Systems (PHY 1114)
  • Level I: Geometrical and Physical Optics (PHY 1214)
  • Level III: Statistical Physics PHY3114
  • Level II (Special Degree): Lecturer In-charge of Special Degree practical classes PHY4071
  • 2017/2018
  • Level I: Geometrical and Physical Optics (PHY 1214)
  • Level III: Statistical Physics PHY3114
  • Level II (Special Degree): Lecturer In-charge of Special Degree practical classes PHY4071
  • Level I & II (Special Degree): Statistical Mechanics (PHY4094)
  • 2018/2019
  • Level I: Wave Motion and Acoustics Mechanical Systems (PHY 1114)
  • Level I: Geometrical and Physical Optics (PHY 1214)
  • Level III: Statistical Physics PHY3114
  • Level II (Special Degree): Lecturer In-charge of Special Degree practical classes PHY4071
  • 2019/2020
  • Level I: Wave Motion and Acoustics Mechanical Systems (PHY 1114)
  • Level I: Geometrical and Physical Optics (PHY 1214)
  • Level III: Statistical Physics PHY3114
  • Level II (Special Degree): Lecturer In-charge of Special Degree practical classes PHY4071
  • Level I (Special Degree): Mathematical Methods for Physics (PHY4014)
  • • Development of a High resolution multi grating spectrometer controlled by Arduino: Physics Special Degree Research Project. (2019)
  • • Evaluation of Energy Efficient Indoor Lighting Bulbs in Southern Province, Sri Lanka - Undergraduate Research Project (FSC3bP2) 2018 (supervised 4 students)
  • • A System to automatically change water in a fish tank by analyzing pH level: Physics Special Degree Research Project (2018)
  • • Development of a low-cost optical spectrometer for visible region: Physics Special Degree Research Project (2016-2017)
  • • Determination of surface tension of water and interfacial tension of water-kerosene interface by light diffraction (2016)
  • • Development of a low-cost monochromator: Physics Special Degree Research Project (2014-2015)
  • • Investigation of electric potential profile in semiconducting heterostructures placed in an external electric field: Physics Special Degree Research Project (2013)
  • • Graduate Research Assistant, Physics Department, University of Cincinnati (2007 – 2012)
  • o Performed detailed studies on GaAs/AlGaAs core-shell nanowires using photoluminescence and time-resolved photoluminescence Spectroscopies. These studies show exciton lifetimes in these nanowires of ~1ns, equivalent to high quality two-dimensional heterostructures. State filling and many-body interaction effects were observed by increasing the carrier densities using pulsed laser excitation. Perera et al. Applied Physics Letters 93, 053110 (2008).
  • o Polarized time-resolved photoluminescence used to study exciton dynamics in GaAs/AlGaAs core-shell nanowires at ~20K. Since the diameter of the nanowire is much larger than the exciton Bohr radius, the exciton dipoles are degenerate regardless of orientation. Thus, in thermal equilibrium the density of excitons parallel and perpendicular dipoles should be equal. At low excitation intensities the excitons are created out of thermal equilibrium, but relax within several hundred picoseconds. At higher excitation powers, the exciton dipoles relax much more rapidly within a time. This suggests that exciton dipole relaxation is very sensitive to carrier-carrier scattering. http://meetings.aps.org/link/BAPS.2009.MAR.L10.8
  • o Time-resolved photoluminescence spectroscopy was used to study the photoluminescence (PL) of wurtzite InP nanowires at ~12K with various diameters of 5, 20, 30, 50, 100 and 150nm. In the 5, 20, 30nm diameter NW samples, a PL peak around 1.511~1.530eV was observed at early times which decays rapidly leaving a long-lived defect-related emission peak. In the 50,100 and 150nm samples at early times a PL peak was observed around 1.504eV (band edge) that evolves at later times to a long-lived defect emission line around 1.457~1.475eV. This investigation suggests some quantum confinement for the NWs with smaller radius than the Bohr radius. http://meetings.aps.org/link/BAPS.2010.MAR.Q14.7
  • o Photoluminescence excitation (PLE), time-resolved photoluminescence (PL), and CW photoluminescence were used to investigate the electronic structure of wurtzite InP nanowires (NWs) as a function of diameter (50, 100 nm) at 10 K. The laser was polarized parallel and perpendicular to the nanowire and the PL was collected with circular polarization. PLE spectra showed three peaks for the A, B and C hole bands. Currently I am extending these PLE measurements to probe transitions between the A, B and C valence bands to the higher level conduction band recently proposed by De et al. Physical Review B 81, 155210 _2010.
  • Perera et al. Applied Physics Letters 97, 023106 _2010.
  • o Photocurrent measurements on individual WZ and ZB InP nanowires were performed at room and low temperatures to verified the valence band structure measurement produced by PLE experiment.
  • http://meetings.aps.org/link/BAPS.2011.MAR.J32.2
  • o PL and exciton lifetime of a GaAs quantum well tube nanowire were carried out in the presence of an external electric field. Also developed a theoretical model to demonstrate the potential profile in the vicinity of the nanowire due the applied electric field by using finite element calculations.
  • • Undergraduate Research, University of Ruhuna, Matara, Sri Lanka (2002)
  • o Satellite reflectance Data was processed and analyzed to investigate the vegetation index on wet and dry zone in Sri Lanka.
  • 1) Development of a low-cost high-resolution multi grating Spectrometer controlled by Arduino Wijethunga M V , Abeywickrama S S, Perera H A D S D 8th Ruhuna International Science and Technology Conference, 2021
  • 2)Automated Modeling Method for S0 galaxies to Unveil the Effect of Cluster Environment on their Formation, K Samararathna, P Alahakoon, S Kalawila Vithanage, W Barkhouse, M De Silva, S Perera, K Mahanama, American Astronomical Society Meeting Abstracts 53 (1), 148.04, 2021
  • 3)Unveiling an Optimum Method for Modeling Cluster S0 Galaxies, K.G. Samararathna, A.G.P.D. Alahakoon, K.V.S. Prasadh, Wayne A. Barkhouse, W.M.K. De Silva, H.A.D.S.D. Perera, G.D.K. Mahanama, Ruhuna International Science & Technology Conference – 2020, University of Ruhuna, ISSN: 1391-8796
  • 4) Design, Fabrication and Test of Plano-Convex Lenses Using Locally Available Materials for Applications in Telescopes, M.K.T.S. Sameera, B.A.T.M. Thilakarathna, K.G. Samaratathna, A.G.P.D. Alahakoon, H.D.S. Amaradasa, H.A.D.S.D. Perera, G.D.K. Mahanama, 16th Academic Sessions -2019, University of Ruhuna, ISSN: 2362-0412
  • 5) Development of a low cost optical spectrometer for visible region, K. Abeywickrama, L.G.R.C. Lewangama, S.S. Abeywickrama, N.T. Wickramasuriya, W.M.K. De Silva, H.A.D.S.D. Perera, Ruhuna International Science & Technology Conference – 2018, University of Ruhuna, ISSN: 1391-8796
  • 6) Determination of surface tension of water and interfacial tension of water-kerosene interface by light diffraction, H.A.D.S.D. Perera, Ruhuna International Science & Technology Conference – 2016, University of Ruhuna, ISSN: 1391-8796
  • 7) Variation of Electric Potential in a semiconducting Hetero Structure Placed in an External Electric Field, M.D. Silva, S.D. Perera, 11th Academic Sessions -2014, University of Ruhna, ISSN: 2362-0412
  • 8) Determining wurtzite band structure using optical spectroscopies on single InP nanowires, Karunananda Pemasiri, Saranga Perera, Yuda Wang, Mohammad Montazeri, Howard Jackson, Leigh Smith, Jan Yarrison-Rice, Qian Gao, Hoe Tan, Chennupati Jagadish, AIP Conf. Proc. 1566, 476 (2013)
  • 9) Illuminating the Second Conduction Band and Spin?Orbit Energy in Single Wurtzite InP Nanowires, Saranga Perera, Teng Shi, Melodie A. Fickenscher, Howard E. Jackson, Leigh M. Smith, Jan M. Yarrison-Rice, Suriati Paiman, Qiang Gao, Hark Hoe Tan, and Chennupati Jagadish, Nano Lett., 2013, 13 (11), pp 5367–5372
  • 8) Photocurrent Spectroscopy of ZB and WZ InP Nanowire Ohmic devices, K Pemasiri, S Perera, HE Jackson, LM Smith, JM Yarrison-Rise, S Paiman, Q Gao, HH Tan, C Jagadish, Bulletin of the American Physical Society APS March Meeting 2013 Volume 58, Number 1
  • 10) Probing the valence band structure of wurtzite InP nanowires by photoluminescence excitation spectroscopy, HE Jackson, S Perera, K Pemasiri, LM Smith, J Yarrison-Rice, JH Kang, Q Gao, HH Tan, C Jagadish, Y Guo, J Zou, AIP Conf. Proc. 1399, 481 (2011)
  • 11) Photoreflectance measurements of single wurtzite InP nanowires, M Montazeri, A Wade, S Perera, K Pemasiri, LM Smith, HE Jackson, JM Yarrison-Rice, S Paiman, Q Gao, HH Tan, C Jagadish, Bulletin of the American Physical Society APS March Meeting 2011 Volume 56, Number 1
  • 12) Investigation of Electronic Structure in Wurtzite InP Nanowires, Saranga Perera, K Pemasiri, M Fickenscher, A Wade, LM Smith, HE Jackson, JM Yarrison-Rice, S Paiman, Q Gao, H Tan, C Jagadish, Bulletin of the American Physical Society APS March Meeting 2011 Volume 56, Number 1
  • 13) Photocurrent Spectroscopy of single ZB, WZ InP Nanowire devices, K Pemasiri, S Perera, A Wade, HE Jackson, LM Smith, JM Yarrison-Rice, S Paiman, Q Gao, HH Tan, C Jagadish, Bulletin of the American Physical Society APS March Meeting 2011 Volume 56, Number 1
  • 14) Probing valence band structure in wurtzite InP nanowires using excitation spectroscopy, S. Perera, K. Pemasiri, M. A. Fickenscher, H. E. Jackson, L. M. Smith,J. Yarrison-Rice, S. Paiman, Q. Gao, H. H. Tan, and C. Jagadish Applied Physics Letters 97, 023106 _2010. "Probing valence band structure in wurtzite InP nanowires using excitation spectroscopy" published in Applied Physics Letters 97, 023106 (2010), has been selected for the August 2010 issue of Virtual Journal of Ultrafast Science. The Virtual Journal is published by the American Physical Society and the American Institute of Physics.
  • 15) Variation of Wurtzite InP Nanowire Photoluminescence With Diameter, Saranga Perera, K Pemasiri, A Wade, LM Smith, HE Jackson, JM Yarrison-Rice, S Paiman, Q Gao, H Tan, C Jagadish, Bulletin of the American Physical Society 2010 APS March Meeting Volume 55, Number 2
  • 16) Photoluminescence from core/multiple-shell GaAs/AlGAs Nanowires, MA Fickenscher, SD Perera, HE Jackson, LM Smith, JM Yarrison-Rice, HJ Joyce, Y Kim, Q Gao, HH Tan, C Jagadish, Bulletin of the American Physical Society 2009 APS March Meeting Volume 54, Number 1
  • 17) Polarization Dynamics of Twin Free GaAs/AlGaAs Core-Shell Nanowires, S Perera, LM Smith, HE Jackson, JM Yarrison-Rice, HJ Joyce, Y Kim, Q Gao, HH Tan, C Jagadish, X Zhang, J Zou, Bulletin of the American Physical Society 2009 APS March Meeting Volume 54, Number 1
  • 18) Unexpected Benefits of Rapid Growth Rate for III/V Nanowires, Hannah Joyce, Q. Gao, H.H. Tan, C. Jagadish, Y. Kim, M.A. Fickenscher, S. Perera, T.B. Hoang, L.M. Smith, H.E. Jackson, J.M. Yarrison-Rice, J. Zhang, and J. Zou, Nano Letters 9, 695-701 (2009).
  • 19) High Purity GaAs Nanowires Free of Planar Defects: Growth and Characterization, Hannah J. Joyce, Qiang Gao, H. Hoe Tan, Chennupati Jagadish, Yong Kim, Melodie A. Fickenscher, Saranga Perera, Thang Ba Hoang, Leigh M. Smith, Howard E. Jackson, Jan Yarrison-Rice, Xin Zhang and Jin Zou, Advanced Functional Materials 18, 1-7 (2008).
  • 12) Optical properties of single InP and GaAs nanowire heterostructures, HE Jackson, S Perera, MA Fickenscher, LM Smith, JM Yarrison-Rice, HJ Joyce, Q Gao, HH Tan, C Jagadish, X Zhang, J Zou, IEEE Lasers and Electro-Optics Society, 2008. 10.1109/LEOS.2008.4688673
  • 21) Nearly intrinsic lifetimes in twin-free GaAs/AlGaAs core-shell nanowire heterostructures, S. Perera, M.A. Fickenscher, H.E. Jackson, L.M. Smith, J.M. Yarrison- Rice, H.J. Joyce, Q. Gao, H.H. Tan, C. Jagadish, X. Zhang, and J. Zou, Applied Physics Letters 93, 053110 (2008).
  • 22) Growth, structural and optical properties of high quality GaAs nanowires for optoelectronics, H. J. Joyce, G. Qiang, K. Yong, H. H. Tan, C. Jagadish, Z. Xin, G. Yanan, Z. Jin, M. A. Fickenscher, S. Perera, T. B. Hoang, L. M. Smith, H. E. Jackson, J.M. Yarrison-Rice., 2008 8th IEEE Conference on Nanotechnology (NANO), pp59-62.
  • 23) Photoluminescence Dynamics of GaAs/AlGaAs Core-Shell Nanowires, HJ Joyce, Y Kim, Q Gao, HH Tan, C Jagadish, MA Fickenscher, S Perera, TB Hoang, HE Jackson, LM Smith, JM Yarrison-Rice, X Zhang, J Zou, Bulletin of the American Physical Society 2008 APS March Meeting Volume 53, Number 2
  • 24) Investigation of the Electronic Structure of GaAs/AlGaAs Core Multi-Shell Nanowires, S Perera, MA Fickenscher, TB Hoang, HE Jackson, LM Smith, JM Yarrison-Rice, HJ Joyce, Q Gao, Y Kim, HH Tan, C Jagadish, Bulletin of the American Physical Society 2008 APS March Meeting Volume 53, Number 2
  • • Award of Innovations and Commercialization Enhancement (ICE) projects under the Accelerating Higher Education Expansion and Development Operation (AHEAD) (2019)
  • • Certificate course for professional development in higher education-Staff development center, University of Ruhuna, Matara. (CCPDHE-2013)
  • • University Graduate Scholarship - University of Cincinnati, OH (Fall 2005- Spring 2012)
  • • 2011 Graduate Student Research Fellowship - University Research Council, University of Cincinnati.
  • • Henry Laws & Mary J. Hanna Fellowship (summer 2011) – Department of Physics University of Cincinnati.
  • • ‘Vasantha Mohotti’ memorial gold medal - Highest score in B.Sc. special degree in Physics, University of Ruhuna, Sri Lanka (2002)
  • CONTRIBUTION TO THE UNIVERSITY
  • • I have been working as the Acting Head of the Department of Physics for numerous occasions
  • • I performed my duties as the Science Faculty member of the 16th Academic Sessions & 15th Vice Chancellors Awards Ceremony - 2019
  • • I have worked as a student counsellor of the Faculty of Science since 2014 to 2017 (more than 4 years)
  • • I have been working as a mentor/academic counsellor for since 2017 up-to-date
  • CONTRIBUTION TO WORK IN THE FACULTY
  • • I worked as a member of reviewing panel of RITSCON 2015
  • • I performed duties as a session convener for Technical session in RITSCON 2015
  • • I worked as a member of reviewing panel of RITSCON 2016
  • • I performed duties as a session convener for Technical session in RITSCON 2016
  • • I worked as a member of reviewing panel of RITSCON 2018
  • • I worked as a member of reviewing panel of RITSCON 2019
  • • I am working as a member of the Industrial Training & Research Coordinating Center with effect from 09/04/2019
  • CONTRIBUTION TO OTHER WORK IN THE FACULTY
  • (a) Member of the 10th Science Symposium - 2013 committee
  • (b) Member of the organizing committee of the Faculty day-2014
  • (c) Chairperson of the Invention and Innovation Exhibition - 2014
  • (d) Secretary of the organizing committee, of the Invention and Innovation Exhibition 2016-2019
  • (e) Member of the TEC committee -Dept. of Computer Science- 2019
  • (f) Faculty coordinator for the games (Rugby) offered by the Physical Education - 2019
  • CONTRIBUTION TO NATIONAL DEVELOPMENT
  • • I have been served as a chief examiner of the A/L paper marking panels since year 2013 up to date
  • • Performed duties as a resource person in the workshop conducted by Southern Province Education Department and Department of Physics, University of Ruhuna -2017 (Nanoscience and Nanotechnology)
  • • Performed duties as a resource person in the workshop conducted by Southern Province Education Department and Department of Physics, University of Ruhuna -2018 (Waves and Vibrations)
  • • I have been working as the secretary of Ruhuna Invention and Innovation Exhibition (RIIE) since 2016. This is an annual event, which is open to Ruhuna University students and staff, school children and to all other inventors in the Southern province. The exhibition provides opportunity to demonstrate novel ideas and display innovative products to the community.
  • • I have been served as supervisor for Physics and Astronomy Olympiad Competition organized by Institute of Physics Sri Lanka at University of Ruhuna in year 2017 and 2018
  • • Performed duties as an Evaluator of Research project proposal in Eastern University, Sri Lanka in 2016.