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Rastogi Vipul
Vipul Rastogi Associate Professor vipulfph[at]iitr.ac.in 91-01332-285333
Areas of Interest
  • Fiber Optics, Specialty Optical Fibers, Fiber Amplifiers, EDFA, LMA Fibers, DCF, Fiber Sensors
  • Integrated Optics, Design of optical waveguides for high power amplifiers and lasers, dispersion management
  • Optoelectronics, Light extraction in LED and OLED, Thin film solar cells
Professional Background
FromToDesignationOrganisation
19981999Postdoctoral FellowUniversity of Nice, France
20002003Research FellowCity University of Hong Kong
20032012Assistant ProfessorPhysics Department, IIT Roorkee
2012On goingAssociate ProfessorPhysics Department, IIT Roorkee
JUN 2005JUL 2005Visiting FellowCity University Hong Kong
JUN 2008JUL 2008Invited ProfessorLPMC Université de Nice, France
MAY 2013JULY 2013Invited ProfessorLPMC Université de Nice, France
Honors and Awards
AwardInstituteYear
IAPT-DSM Award for UG Physics Teaching by Indian Association of Physics Teachers Indian Association of Physics Teachers2016
Outstanding Teacher AwardIIT Roorkee2011
Senior Member Designation Optical Society of America2011
Best Paper Award (Scientist Category)Conference ICOP-2009, CSIO Chandigarh2009
French Government Post-doctoral FellowshipUniversite de Nice-Sophia Antipolis France1998
Educational Details
DegreeSubjectUniversityYear
Ph. D.PhysicsIIT Delhi1998
M. Sc.PhysicsIIT Roorkee (formerly Universty of Roorkee)1993
B. Sc.Physics, MathematicsRohilkhand University Bareilly1991
Administrative Background
FromToDesignationOrganisationLevel
2017ongoingAssociate Dean Academic Affairs - CurriculumIIT Roorkee
20162017Chief AdvisorStudents' Club
20132015TreasurerAdarsh Bal Niketan
20122012Co-cordinatorCognizance 2012
20092010WardenGovind Bhawan
2015ongoingDy OC High Power Laser Lab
20162017Staff Adviser Training and PlacementPhysics Department
20042017OC Laser Physics LaboratoryPhysics Department
20082010OC Administration and MaintenancePhysics Department
Participation in seminars
NamePlaceSponsored ByDate
17th OptoElectronics & Communication Conference - OECC 2012Busan, South KoreaPDA02-07-2012
XXIII International Workshop on Optical Wave & Waveguide Theory and Numerical Modelling – OWTNM 2015LondonPDAApril 2015
XXI International Workshop on Optical Wave & Waveguide Theory and Numerical Modelling – OWTNM 2013Enschede, The NetherlandsPDAApril 2013
International Winter School on Organic Electronic Materials & Devices – OEMD 2013NITK Surathkalorganizers19-12-2013
Indo-UK Seminar on Computational PhotonicsIIT DelhiDST-Royal Soc.01-03-2014
XXXVIII Symposium of Optical Society of India and International Conference on Optics & OptoelectroniIRDE DehradunProject05-03-2014
XXII International Workshop on Optical Wave & Waveguide Theory and Numerical Modelling – OWTNM 2014Nice, FrancePDA/PDF27-06-2014
International Conference on Optics and Optielectronics - ICOL 2005IRDE DehradunDRDODecember 1
XXI International Workshop on Optical Wave & Waveguide Theory and Numerical Modelling – OWTNM 2013Enschede, The NetherlandsPDA18-04-2013
XXXVI OSI SYMPOSIUM on Frontiers in Optics and Photonics - FOP 11IIT DelhiProject Grant03-12-2011
International Conference on Specialty Glass and Optical Fiber: Materials, Technology and Devices - ICGCRI KolkataProject Grant2011-08-04
XXXV OSI Symposium on Contemporary Trends in Optics and OptoelectronicsThiruvanantpuramPDF17-01-2011
International Conference on Fiber Optics and Photonics - Photonics 2010IIT GuwahatiProject Grant13-12-2010
15th OptoElectronics and Optical Communication Conference - OECC2010Sapporo, JapanPDF05-07-2010
Indo-Australia Solar Energy WorkshopAmity Univ. NoidaFeb. 9-10,
International Symposium on Microwave and Optical Technology - ISMOT 2009Hotel Ashok New DelhiDec. 16-19
International Conference on Optics and Photonics - ICOP 2009CSIO ChandigarhOct. 30 -
Optical Fiber SensorsEdinburghUKIERI Project GrantOct. 5-7 2
International Conference on Fiber Optics and Photonics - Photonics 2008New DelhiDec. 13-17
Indo-UK Workshop on Microstructured Optical FibersCGCRI KolkataJan. 5-7,
Workshop on Optical Fiber Sensors and ComponentsBritish Council New DelhiDec. 7 - 9
Memberships
  • Optical Society of America, Senior Member
  • Optical Society of India, Life Fellow
  • Indian Laser Association, Life Member
  • IEEE Photonics Society, Member
  • Indian Association of Physics Teachers, Life Member
  • Indian Physics Association, Life Member
Projects and Thesis Supervised
Title of ProjectNames of Students
Microstructured optical fibers for high power lasersSudheer Kumar
Studies on long period gratings in optical waveguidesAnil Boyal
Large-mode-area dispersion compensating fibreRajiv Kumar
Leaky optical waveguide based sensorsAnil Boyal
Surface plasmon based optoelectronic devicesrajiv Kumar
Optical fiber chemical sensorsAnil Boyal
Recent advances in TDFARajiv Kumar
Integrated optic waveguide lasersPrince Gupta
Integrated optic polarization filter based on leaky structurePrince Gupta
Methods for strain estimation in single fossil forms and graphical representation of asymmetric foldRajit Ghosh
MATLAB programs for strain analysis from elliptical markersAshok Kumar
Propagation characteristics of leaky optical waveguidesBhawana Rautela
Gain equalization of EDFA using leaky structuresPrashant Singh
Modelling fabrication and characterization of integrated optic planar waveguideBhawana Rautela
Full vectorial analysis of microstructured optical fiberPrashant Singh
Long period waveguide gratingsBhawana Rautela
Methods for modeling of microstructured optical fibersPrashant Singh
Surface plasmons-based photovoltaic solar cellsSuman Das
Dispersion studies on dual-core optical fiberSuman Das
Application of polymers in optical communicationPurushottam Singh
Microstructured optical fibersAlok Kumar
Fiber optic Raman amplifierAbhishek Sharma
Fiber Bragg gratingsRohit Malik
Fabrication of glass waveguides using double ion exchangeAbhishek Sharma and Alok Kumar Singh
Design of optical fibers for gain flattening of optical amplifiersAlok Kumar and Anant Rao Saladi
Matrix method in fiber and integrated opticsKaushik Chaudhury
Fiber optic communication linkKaushik Chaudhury and Rohit Malik
Propagation Characteristics of microstructured specialty optical fibersS. P. Chakrabarty
Fiber-optic sensorRajkumar Patra & Poulami Ghosh
Thulium doped fiber amplifiersRajkumar Patra
Point representation of asymmetric foldsDipanwita Nandy (Earth Sciences)
High power fiber lasersPoulami Ghosh
Fabrication and characterization of glass optical waveguidesDurgesh Kumar Yadav and Prabhat Kumar
Optical fiber amplifierPrabhat Kumar
Photonic Crystal/Photonic bandgap waveguidesDurgesh Kumar Yadav
Investigations on index-guided photonic crystal fiberSudheer Kumar & Shailendra Kumar
Oblique flattening of parallel folds: a mechanism for development of complex fold geometryAlisha Mehra (Earth Sciences)
Research Scholar Groups
Scholar NameInterest
Ankita GaurFew-Mode Erbium Doped Fiber Amplifier
Vidhi MannOptoelectronics
Uma Shankar TripathiLiquid Crystal Photonics
Ashish BijalwanPlasmonics
Md. RehanFiber Amplifiers and Lasers
PHDs Supervised
TopicScholar NameStatus of PHDRegistration Year
Large modearea rectangular optical waveguides and fibersAjeet KumarA2004
Optical fiber designs for amplifiers and sensorsK. KamakshiA2008
Design and study of planar optical waveguide components and devicesAshok NandamA2008
Application specific multilayer optical structuresBabitaA2009
Design and study of long period waveguide grating devices using natural optimization algorithmsGirish SemwalA2009
Multiband photonic integrated circuits using plasmonic MIM waveguideK. ThirupathaiahA2010
Studies on multi-mode erbium doped fiber amplifierAnkita GaurO2013
Multilayer structures for optoelectronics applicationsVidhi MannO2013
Liquid crystal based integrated optic components and devicesUma Shankar TripathiO2014
Metallic grating assisted surface plasmon resonance based devicesAshish BijalwanO2014
To be decidedMd. RehanO2015
Visits to outside institutions
Institute VisitedPurpose of VisitDate
LPMC, Université Nice Sophia Antipolis, Nice, FranceResearch CollaborationApril 2015
LPMC, Université Nice Sophia Antipolis, Nice, FranceVisiting ResearcherJune 2014
LPMC, Université Nice Sophia Antipolis, Nice, FranceVisiting ProfessorMay 2013
City Univ. LondonUKIERI Project meeting14-07-2012
City Univ. LondonUKIERI Project meeting and research collaboration10-07-2010
Univ. of Southampton, Heriot Watt Univ. Edinburgh, and City Univ. LondonUKIERI project meeting and research collaboration01-10-2009
University of Nice, FranceResearch Collaboration03-06-2009
City University London, Univ. of NottinghamResearch Collaboration under UKIERI project11-07-2008
University of Nice FranceVisiting Scientist02-06-2008
University of Nice FranceResearch CollaborationDecember 2
University of Limoges FranceResearch CollaborationDecember 2
City University LondonResearch CollaborationAugust 200
University of Southampton UKResearch CollaborationAugust 200
Heriot Watt University EdinburghResearch CollaborationAugust 200
University of Nice FranceResearch CollaborationDecember 2
University of Limoges FranceResearch CollaborationDecember 2
City University of Hong KongResearchJune-July
Courses or Conferences Organised
Conference NameSponsored ByDate
Seminar Series on Fiber Optics Photonics and ApplicationsQIP20-22 Janu
Indo-UK workshop on "Recent Advances in Fiber Optics and Photonics - RAFOP 2006"DRDO, CSIR, EPSRCAugust 25
National International Collaboration
TopicOrganisationLevel
Indo-French Networking Project on Specialty Optical Fibers and Fiber based Components for Optical CommunicationLPMC Nice, XLIM Limoges, IIT Delhi, CGCRI Kolkata RP
UKIERI major award on "Research on application specific microstructured optical fiber."City Univ. London, Univ. of Southampton, Heriot Watt Univ. Edinburgh, Univ. of Nottingham, IIT DelhiRP
Development of silica based segmented cladding fiber CGCRI, KolkataRP
Innovative light extraction technology for white OLEDIIT Delhi, Moser Baer India Ltd. Greater NoidaRP
Refereed Journal Papers
  1. A. Gaur and V. Rastogi, “Design and analysis of high-power segmented-core trench-assisted Yb-free erbium doped fiber amplifier,” Optics and Laser Technology, vol. 95, pp. 46-50, 2017.
  2. V. Mann, B. Hooda, and V. Rastogi, “Improvement of light-extraction efficiency of organic light-emitting diodes using dielectric nanoparticles,” Journal of Nanophotonics, vol. 11, p. 03610, 2017.
  3. B. Hooda and V. Rastogi, “Low cost highly sensitive miniaturized refractive index sensor based on planar waveguide,” Optik-International Journal for Light and Electron Optics, vol. 143, pp. 158-166, 2017.
  4. V. Mann and V. Rastogi, “Dielectric nanoparticles for the enhancement of OLED light extraction efficiency,” Optics Communications, vol. 387, pp. 202-207, 2017.
  5. A. Pal, A. Dhar, A. Ghosh, R. Sen, B. Hooda, V. Rastogi, M. Ams, F. Mathias, T. Sun, and K. T. V. Grattan, “Sensors for harsh environment : radiation resistant FBG sensor system,” IEEE-OSA J. Lightwave Technology, vol. 35, pp. 3393-3398, 2017.
  6. V. Rastogi, A. Gaur, P. Aschieri, and B. Dussardier, “Mode group specific amplification length in an asymmetric LPG assisted few-mode EDFA,” Optics Communications, vol. 382, pp. 13-17, 2017.
  7. A. Gaur and V. Rastogi, “Design and analysis of annulus core few-mode EDFA for modal gain equalization,” IEEE Photonics Technology Letters, vol. 28, pp. 1057-1060, 2016.
  8. G. Semwal and V. Rastogi,” Design optimization of long period waveguide grating devices for refractive index sensing using adaptive particle swarm optimization,” Optics Communications, vol. 359, pp. 336-343, 2016.
  9. N. Ashok and V. Rastogi, “Design and study of trench-assisted long-period-waveguide-grating based gain flattening filter for erbium-doped waveguide amplifier,” J. Optics (OSI), DOI 10.1007/s12596-015-0286-1, 2015.
  10. B. Hooda, A. Pal, V. Rastogi, R. Sen, and J. Kobelke, “Segmented cladding fiber fabricated in silica-based glass,” Optical Engineering, vol. 54, pp. 075103, 2015.
  11. V. Mann, N. Ashok, and V. Rastogi, “Coupled strip-slot waveguide design for dispersion compensation,” Optical and Quantum Electronics, vol. 47, pp. 3161-3169, 2015.
  12. G. Semwal and V. Rastogi, “Design optimization of two concatenated lon period waveguide grating devices for an application specific target spectrum,” Applied Optics, vol. 54, pp. 3141 – 3149, 2015.
  13. G. Semwal and V. Rastogi, “Design of LPWG broad band filters with genetic algorithm optimization,” J Optics (OSI), vol. 43, pp. 165-168, 2014.
  14. K. Thirupataiah, B. Iyer, N. P. Pathak, and V. Rastogi, “Concurrent dual-band diplexer for nanoscale wireless links,” IEEE Photonics Technology Letters, vol. 26, pp. 1832 - 1835, 2014.
  15. G. Semwal and V. Rastogi, “Design of application specific long period waveguide grating filters using adaptive particle swarm optimization algorithms,” J Optics (IOP), vol. 16, pp. 15504(1-8), 2014.
  16. G. Semwal and V. Rastogi, “Derivative free method for computing modes of multilayer planar waveguide,” Optical and Quantum Electronics, vol. 46, pp. 423-438, 2014.
  17. B. Hooda and V. Rastogi, “Design of segmented cladding fiber for femtosecond laser pulse delivery at 1550 and 1064 nm wavelengths,” Optical and Quantum Electronics, vol. 46, pp. 397-408, 2014.
  18. K. Thirupataiah, N. P. Pathak, and V. Rastogi, “Concurrent dual-band filters using plasmonic slot waveguide,” IEEE Photonics Technology Letters, vol. 25, pp. 2217-2220, 2013.
  19. N. Ashok, and V. Rastogi, “Dual-core leaky waveguide-based filters for erbium doped waveguide amplifier,” Fiber and Integrated Optics, vol. 32, pp. 242-250, 2013.
  20. K. Kamakshi, V. Rastogi, and A. Kumar, “Design and analysis of a refractive index sensor based on dual-core large-mode-area fiber,” Optical Fiber Technology, vol. 19, pp. 325-329, 2013.
  21. G. Prabhakar, A. Peer, V. Rastogi, and A. Kumar, “Large-effective-area dispersion-compensating fiber design based on dual-core microstructure,” Applied Optics, vol. 52, pp. 4505-4509, 2013.
  22. B. Hooda, and V. Rastogi, “Segmented-core single mode optical fiber with ultra-large-effective-area, low dispersion slope and flattened dispersion for DWDM optical communication system,” Progress in Electromagnetic Research B, vol. 51, pp. 157-175, 2013.
  23. N. Ashok, V. Rastogi, and A. Kumar, “Long-period-grating in a trench assisted planar optical waveguide,” Applied Optics, vol. 52, pp. 1954-1962, 2013.
  24. Babita, V. Rastogi, and A. Kumar, “Design of large-mode-area three-layered fiber structure for femtosecond laser pulse delivery,” Optics Communications, vol. 293, pp. 108-112, 2013.
  25. V. Rastogi, “Application specific leaky optical fibers,” J. Optics (OSI), vol. 42, pp. 42-50, 2013.
  26. N. Ashok, V. Rastogi, and A. Kumar, “Dual-core leaky optical waveguide as an integrated-optic polarizer,” Optics Communications, vol. 285, pp. 5094-5099, 2012.
  27. A. Kumar, V. Rastogi, A. Agrawal, and B. M. A. Rahman, “Birefringence analysis of segmented cladding fibre,” Applied Optics, vol. 51, pp. 3104-3108, 2012.
  28. K. Kamakshi, and V. Rastogi, “Inherently gain flattened S-band erbium doped fiber amplifier based on dual core resonantly leaky fiber,” Optics Communications, vol. 285, pp. 2821-2825, 2012.
  29. V. Rastogi, R. Kumar, and A. Kumar, “Large-effective-area all-solid dispersion compensating fiber,” J. Optics (IOP), vol. 13, pp. 125707(1-6), 2011.
  30. A. Kumar and V. Rastogi, “Design and analysis of dual-shape-core large-mode-area optical fiber,” Applied Optics, vol. 50, pp. E119 - E124, 2011.
  31. V. Rastogi, N. Ashok, and A. Kumar, “Design and analysis of large-core high-GVD planar optical waveguide for dispersion compensation,” Applied Physics B, 2011, vol. 105, pp. 821-824, 2011.
  32. B. Dussardier, V. Rastogi, A. Kumar and G. Monnom, “Large mode area leaky optical fiber fabricated by MCVD.” Applied Optics, vol. 50, pp. 3118 - 3122, 2011.
  33. K. Kamakshi, V. Rastogi, P. Singh and A. Kumar, “Design of dual-core resonant leaky optical fibre based gain flattening filters for erbium doped fibre amplifiers,” Optics Communications, vol. 283, pp. 5025-5027, 2010.
  34. D. C. Srivastava, V. Rastogi and R. Ghosh, “A rapid Bezier curve method for shape analysis and point representation of asymmetric folds,” J. Structural Geology, vol. 32, pp. 685-692, 2010.
  35. L. Labonte, V. Rastogi, A. Kumar, B. Dussadier and G. Monnom, “Birefringence analysis of multilayer leaky cladding optical fiber,” J. Optics (IOP), vol. 12, pp. 065705 (1-4), 2010.
  36. K. Kamakshi, V. Rastogi, A. Kumar and J. Rai, “Design and fabrication of a single-mode optical fiber based refractive index sensor,” Microwave and Optical Technology Letters , vol. 52, pp. 1408-1411, 2010.
  37. D. C. Srivastava, and V. Rastogi, “HingeInflex – a MATLAB-based method for precise selection of the hinge and the inflection points in folds,” Geological Magazine, vol. 147, pp. 233-241, 2010.
  38. J. Shah, D. C. Srivastava, V. Rastogi, R. Ghosh, and A. Pal, “Strain estimation from single forms of distorted fossils – a computer graphics and MATLAB approach,” J. Geological Society of India, vol. 75, pp. 88-97, 2010.
  39. A. Kumar, V. Rastogi, C. Kakkar, and B. Dussardier, “Co-axial dual-core resonant leaky fibre for optical amplifiers,” J. Optics A: Pure and Applied Optics, vol. 10, pp. 115306 (1-6), 2008.
  40. A. Kumar, and V. Rastogi, “Multilayer cladding leaky planar waveguide for high-power applications,” Applied Physics B, vol. 92, pp. 577-583, 2008.
  41. A. Kumar, V. Rastogi, and K. S. Chiang, “Large-core single-mode channel waveguide based on geometrically shaped leaky cladding,” Applied Physics B, vol. 90, pp. 507-512, 2008.
  42. A. Kumar, and V. Rastogi, “Design and analysis of a multilayer cladding large-mode-area optical fibre,” J. Optics A : Pure and Applied Optics, vol. 10, pp. 015303 (1-6), 2008.
  43. A. Kumar, V. Rastogi, and K. S. Chiang, “Leaky optical waveguide for high power applications,” Applied Physics B, vol. 85, pp. 11-16, 2006.
  44. V. Rastogi, and K. S. Chiang, “Analysis of segmented cladding fiber by the radial effective-index method,” J. Optical Society of America B, vol. 21, pp. 258-265, 2004.
  45. Q. Liu, K. S. Chiang, and V. Rastogi, “Analysis of corrugated long-period gratings in slab waveguides and their polarization dependence,” J. Lightwave Technology, vol. 21, pp. 3399-3405, 2003.
  46. V. Rastogi, and K. S. Chiang, “Holey optical fiber with circularly distributed holes analyzed by radial effective-index method,” Optics Letters, vol. 28, pp. 2449-2451, 2003.
  47. V. Rastogi, and K. S. Chiang, “Leaky optical fibre for large mode area singlemode operation,” Electronics Letters, vol. 39, pp. 1110-1112, 2003.
  48. K. S. Chiang, R. Kancheti, and V. Rastogi, “Temperature-compensated fiber-Bragg-grating-based magnetostrictive sensor for DC and AC currents,” Optical Engineering, vol. 42, pp. 1906-1909, 2003.
  49. K. S. Chiang, K. P. Lor, C. K. Chow, H. P. Chan, V. Rastogi, and Y. M. Chu, “Widely tunable long-period gratings fabricated in polymer-clad ion-exchanged glass waveguides,” Photonics Technology Letters, vol. 15, pp. 1094-1096, 2003.
  50. V. Rastogi and K. S. Chiang, “Long period gratings in planar optical waveguides,” Applied Optics, vol. 41, pp. 6351-6355, 2002.
  51. V. Rastogi, K. S. Chiang, and N. N. Akhmediev, “Soliton states in a nonlinear directional coupler with intermodal dispersion,” Physics Letters A, vol. 301, pp. 27 – 34, 2002.
  52. V. Rastogi and K. S. Chiang, “Propagation characteristics of a segmented cladding fiber,” Optics Letters, vol. 26, pp. 491-493, 2001.
  53. V. Rastogi, P. Baldi, I. Aboud, P. Aschiéri, M.P. De Micheli, D.B. Ostrowsky, and J.P. Meyn, “Effect of proton exchange on periodically poled ferroelectric domains in lithium tantalate,” Optical Materials, vol. 15, pp. 27-32, 2000.
  54. P. Aschiéri, V. Rastogi, L. Chanvillard, P. Baldi, M. De Micheli, D. B. Ostrowsky, G. Bellanca, P. Bassi, K. Thyagarajan and M. R. Shenoy, “Experimental observation of longitudinal modulation of mode fields in periodically segmented waveguides,” Applied Optics, vol. 38, pp. 5734-5737, 1999.
  55. K. El Hadi, V. Rastogi, M. R. Shenoy, K. Thyagarajan, M. De Micheli, and D. B. Ostrowsky, “Spectral measurements of the film-substrate index difference in proton exchanged LiNbO3 waveguides,” Applied Optics, vol. 37, pp. 6463-6467, 1998.
  56. V. Rastogi, A. K. Ghatak, D. B. Ostrowsky, K. Thyagarajan, M. R. Shenoy, “ Ray analysis of parabolic-index segmented planar waveguides,” Applied Optics, vol. 37, pp. 4851-4856, 1998.
  57. V. Rastogi, V. Mahalakshmi, M. R. Shenoy, and K. Thyagarajan, “Propagation characteristics of a novel complementary-structure planar segmented waveguide,” Optics Communications, vol. 148, pp. 230-235, 1998.
  58. V. Rastogi, K. Thyagarajan, M. R. Shenoy, P. Baldi, M. De Micheli, and D. B. Ostrowsky, “Modeling of large-bandwidth parametric amplification in the Cerenkov-idler configuration in planar waveguides,” J. Opt. Soc. of America B, Special issue on Nonlinear Guided Waves: Physics and Applications, vol. 14, pp. 3191-3196, 1997.
  59. K. Thyagarajan, V. Rastogi, M. R. Shenoy, D. B.Ostrowsky, M. De Micheli, and P. Baldi, “Modeling of parametric amplification in the Cerenkov-idler configuration in planar waveguides,” Optics Letters, vol. 21, pp. 1631-1633, 1996.
  60. K. Thyagarajan, V. Rastogi, V. Mahalakshmi, and M. R. Shenoy, “Propagation characteristics of novel gain-guided segmented planar waveguides,” Optics Communications, vol. 121, pp. 19-26, 1995.
Miscellaneous
  • Faculty Facilitator for SURA -2005 project entitled "An optical fiber based pH sensor" carried out by Kaushik Chaudhury and Rohit Malik of M. Sc. (1st yr.) Development of Atomic and Laser Physics Laboratory (a teaching lab.) , US patent on " Optical fiber for Ultra High Capacity Transmission" invented with prof. K. S. chiang of City University of Hong Kong, patent granted on July 27, 2004, Reviewing work for internation journal "Optics Communications" published by Elsevier Science.