Photo of Paul Hill
  • Phone0141 444 7000 ext: 4672
  • 99 George Street, Technology and Innovation Centre

    G1 1RD Glasgow

    United Kingdom

  • 0 Citations
20142022
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Personal profile

Personal Statement

PhD Student

Institute of Photonics

99 George St.

Technology and Innovation Centre,

University of Strathclyde,

Glasgow

G1 1RD

Telephone: 0141 444 7000 ext: 4672

PhD Overview

Diamond photonics is an exciting field where the material's excellent optical properties could be used in a range of applications such as Raman lasing at exotic wavelengths, or Purcell enhancement of defect centres for spin-state quantum registers. Limited dimensions in available optical grade diamond however hinder its integration with current photonic technologies, which we propose to overcome by hybridising ultra-thin diamond membranes "on-demand" with other currently established photonic materials. The choice of host photonic platform will be dictated by the target application - for example, silicon may be used for non-linear optical applications in the telecommunications and Mid-IR bands, whilst a range of III-V semiconductors or SiN, which are transparent in the visible and near-IR, would be compatible with coupling to diamond colour centres for quantum applications.
 
Integration of diamond with other planar waveguide technologies has been achieved using a liquid assisted capillary bonding method with low-added distributed losses of < 0.4 dB (https://doi.org/10.1016/j.diamond.2018.07.020 ) . Micro-assembly fabrication processes will be developed that allow for accurate sub-micrometre bonding of diamond membranes "on-demand" over specific on-chip devices improving on the work we have achieved currently. Extensive research has been conducted into the plasma etching and handling of thin diamond plates and we have successfully achieved the fabrication of ultra-thin (< 1m) single crystal diamond membranes. Future work will look to the fabrication and characterisation of GaN mirco-ring/disk and waveguiding structures interfaced with diamond.
 
Thanks is given to EPSRC [EP/P013597/1] and Fraunhofer UK [EP/L015315/1] who sponsor and support this research.
 
 
Skills learned
 
My PhD thus far has awarded me a great many opportunities to learn and hone several invaluable techniques or skills that will benefit my planned career moving forwards. Some of the most noteworthy of these skills I have listed below:
 
1. Fabrication and handling of ultra-thin sub-micrometre diamond membranes. 
2. Metrology of ultra-thin membranes - Atomic force microscopy, vertical scanning interferometry, stylus profilometry.

3. Nano-scale accurate transfer printing of ultra-thin diamond membranes.

4. Integration of diamond membranes with planar waveguide optical technologies with low added losses of < 0.4 dB.

5. Development of a custom lithography pattern generation tool. Creating mask files to GDSII and UV laser lithography systems.

6. Integrated photonic device design and simulation.

7. All stages of photolithographic process flows - PECVD hard mask deposition, photoresist spin coating, UV exposure, development,
plasma etching.

8. Microfabrication and optical measurements of waveguiding structures.

9. Spectral analysis of resonator structures

Research highlights

 

Most recently I have published a manuscript detailing the work I have done in the fabrication and integration of a 1 μm thick single crystal diamond membrane with a Si photonic chip. 

The successful fabrication of ultra-thin diamond membranes on a distributed bragg reflector (DBR) is a result that we are excited about in our collaborative efforts with Oxford Universities materials department. The prepared diamond membrane on the DBR mirror will be inserted into a free-space tunable cavity and light collected by a fibre to observe Purcell enhancement of diamond defect centres.  The samples were smoothed over time to a sample thickness of less than a micrometre with a surface roughness r.m.s. value of approximately 0.4 nm. The samples used in this work were ordered from Element 6 and are single crystal diamond (SCD) of an electronic grade and dimensions 4 x 4 x 0.2 mm.  

 

Conferences and Publications

Publication, Diamond & Related Materials, "Thin film diamond membranes bonded on-demand with SOI ring resonators" - https://doi.org/10.1016/j.diamond.2018.07.020 - July 2018

 

Integrated Photonics Research, Zurich Conference, Oral presentation, "Hybridisation of diamond with silicon photonic resonators." - https://doi.org/10.1364/IPRSN.2018.ITh2J.5 - July 2018


DeBeers Diamond conference, University of Warwick, poster presentation, "Hybrid integration of diamond membranes with GaN waveguides" - July 2017


1st Year Physics Ph.D talks, Ross Priory, University of Strathclyde. Conference presentation "Heterogeneous integration of diamond photonic devices on non-native substrates" August 2016. PRIZE: Best Talk


Symposium on Quantum Information, Simulation and Metrology, University of Strathclyde. Poster presentation "Microfabrication of thin lm diamond optical devices" - June 2016.

 

 

 

DST-CDT

Education/Academic qualification

Master in Science, University of Warwick

1 Oct 20141 Oct 2015

Bachelor of Science, University of the West of Scotland

1 Oct 20091 Jul 2014

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Network Recent external collaboration on country level. Dive into details by clicking on the dots.

Projects 2014 2022

Research Output 2016 2018

Hybridisation of diamond with silicon photonic resonators

Hill, P. D., Gu, E., Dawson, M. & Strain, M. 10 Jul 2018 (Unpublished)

Research output: Contribution to conferenceSpeech

resonators
diamonds
photonics
silicon
membranes

Micro-assembly of hybrid diamond-Si resonator devices

Hill, P. D., Gu, E. & Strain, M. 4 Jul 2018 (Submitted)

Research output: Contribution to conferenceSpeech

SOI (semiconductors)
grade
assembly
resonators
diamonds

Prizes

Best talk amongst first year physics students presenting at annual progress conference.

Paul Hill (Recipient), 17 Aug 2016

Prize: Prize (including medals and awards)

Activities 2016 2016

  • 1 Participation in workshop, seminar, course

Ross Priory 1st Year Ph.D.Talks

Hill, P. (Participant)
17 Aug 2016

Activity: Participation in workshop, seminar, course