UKIERI Project Review Meeting

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1 UKIERI Project Review Meeting Optical Sources for Sub-Cellular Resolution Optical Coherence Tomography (UKUTP ) University of Calcutta (India) & University of Sheffield (UK) PIs: Prof. Nikhil Ranjan Das (India) & Prof. Richard Hogg (UK) Presented By: N. R. Das and J. Sarma 1

2 Objective of the Project Develop calibrated device models for the realisation of ultra-broad spectral emission superluminescent diodes for biomedical imaging Apply to realise new epitaxial and fabricated device designs Perform skin imaging measurements 500 μm 2

3 Project Plan & Progress Timelines Targeted Outcomes Progress and Comments January 2012 Define Activities in first 6 months Done in Feb January 2012 January 12 - March 2012 January Sept 2012 January September 2012 January September 2012 April September 2012 September day open workshop in Calcutta Sem. evice design, fabrication, & applications Design SLD masks Working model with literature/theoretical values as input parameters Commission characterization test apparatus in Calcutta Mask set purchased and commissioned Training of Calcutta staff in advanced device fabrication First Series of samples realised (SLD, + test and characterization) Workshop couldn t be held due to non-receipt of fund; meeting & lecture organised in Feb.2012 Completed Ongoing - progress made but slowed by lack of Calcutta to Sheffield exchange - visa issue Planning done, but waiting for appropriate funds Completed Not Possible -visa issue Completed 3

4 Project Plan & Progress (contd.) Timelines Targeted Outcomes Progress and Comments September February 2013 Characterization of samples in Sheffield & Calcutta Characterisation of samples ongoing in Sheffield February 2013 Technical Meeting to discuss key results Not Possible -visa issue March June 2013 July 2013 December 2013 December 2013 December 2013 Redesign test mask/sld structures Iterative fabrication / test /redesign process to maximize device characteristics - with preliminary OCT system characterization Final meeting 1 day open workshop in Calcutta area for PDRA/PhD students - Semiconductor device design, fabrication, & applications. Poster session for attendees to present their work. Ongoing. UK Visits started in May

Mask Design Materials & Devices Multi-section

process developed Packaged on copper heat-sink

5 Mask Design Materials & Devices Multi-section ridge for device characterisation & high performance SLD Commercial epitaxial material (QD Laser Inc, JAPAN) Successful fabrication process developed Packaged on copper heat-sink with multiple contacts Emission from either end can be measured 5

6 Material Characterisation Current: 5mA to 150mA 6

7 Device Characterisation 10 segments, 5mm long driven section Current (ma) 7

8 Dot-in a Well (DWELL) Fig. 1 Fig. 2 8

Absorption coefficient (per metre) Electron energy(ev) Modeling Core-shell Quantum Dot r a Energy Calculations: Schrӧdinger equation, Boundary Conditions Radial component of wavefunction in terms of

9 Absorption coefficient (per metre) Electron energy(ev) Modeling Core-shell Quantum Dot r a Energy Calculations: Schrӧdinger equation, Boundary Conditions Radial component of wavefunction in terms of spherical Bessel function 8 x Core radius=2.5nm Core radius=3.5nm Core radius=4.5nm Core radius=5.5nm r b Core radius(nm) n=0 n=1 n=2 n= Absorption Coefficient: (z-polarised light, Gaussian broadening) Frequency(Hz) x

10 Modeling Superluminescent Diode Photon Rate Equation (Steady State): Forward (P)/Backward (Q): dp g~ ( N) N dq g~ ( N) N. P f. Q dz v v dz v r v sp sp Stripe contact gz gz P ( z, N) P0 e ( e 1). gz gz Q ( z, N) Q0e ( e 1). P sp Q sp P(z) Q(z) P(z+dz) Q(z+dz) z z+dz z Forward traveling photon density Reverse traveling photon density 8 8 Photon density (per m 3 ) * g= /m, J=500A/m Forward traveling photon density Reverse traveling photon density Photon density (per m 3 ) *10 27 g=6750/m, J=2.5kA/m Length (in meter) * 10-4 Length (in meter) *

11 Visits From UK to India Profs. R. Hogg, J. Sarma Feb.2012: Initiation meeting R.Hogg presented, outlined details of material growth & fabrication facilities at the National Nanocentre at Univ. of Sheffield Dec.2012: To sort out VISA problems, planning for activities of next 6 months From India to UK Research student (Kanishka Majumder) (May-June 2013) Fabrication, PC/EL measurements Prof. N. R. Das (June 2013) Meetings with colleagues, students (Peyvast, Khozim) Planning next course of activities Requirement of extension felt Some optical components reqd. to be purchased for CU lab for basic measurements. 11

12 Project Outreach No. of exchanges under the project (including academic staff and students) No. of joint publications / research papers Media mention / Press release Workshops organised (please include details like no of participants/key people/key speakers and way forward from the workshop) Two visits from UK (February, December, 2012) Two visits from India (May/June, 2013) Elements of drafts of publishable material in steady progress C.U. convocation address + RPE Dept. website There is every plan and intention to hold a comprehensive workshop near the end date of the project 12

13 Future Activities Planned -Revised Project Plan (From July 2013) Timelines July 2013 Dec Oct Dec.2013 Jan Mar Mar Jun Jun./July 2014 Sep Nov.2014 July 2014 Nov December 2014 Targeted Outcomes (Brief) Working model Commission characterization Training at C.U. Characterization of samples Technical Meeting Redesign SLD structures Maximize device characteristics Final meeting December 2014 One-day Workshop 13

14 Success Indicator of the Project Material Growth Mask Design Preliminary Material & Device Characterization Expt. Knowledge gain by CU student (Device fabrication) 14

15 Sustainability UK-India Workshop Optical Devices for Biophotonics UKIERI Leverhulme International Network Royal Society Seminar/Project Grants Royal Academy of Engineering EPSRC - India-UK, partnership DST, UGC (biophotonic) partnerships HORIZON 2020 (EU) 15

16 Best Practices for Working on Joint Bilateral Projects Clearer prior establishment of staff & student availability at co-operating Institutions Ready availability of visitor (University) accommodation 16

Curriculum Vitae. Omar Mobasher Salih Ghazal. Date of Birth: 10th of March Address: Avro City Complex, Building B40, Apt 12,

Curriculum Vitae. Omar Mobasher Salih Ghazal. Date of Birth: 10th of March Address: Avro City Complex, Building B40, Apt 12, Curriculum Vitae Full Name: Omar Mobasher Salih Ghazal Date of Birth: 10th of March 1984 Address: Avro City Complex, Building B40, Apt 12, Duhok, Kurdistan Region, Iraq. Mobile #: 00964 7718417776 E-mail: