20142020

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Personal profile

Personal Statement

Research Associate

Biomedical Engineering

John Anderson Building
JA.214
107 Rottenrow E,

University of Strathclyde,

Glasgow

G4 0NG

Telephone: 0141 574 5328

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 (< 1um) 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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Projects

Research Output

All-optical tuning of a diamond micro-disk resonator on silicon

Hill, P., Klitis, C., Guilhabert, B., Sorel, M., Gu, E., Dawson, M. D. & Strain, M. J., 17 Feb 2020, In : Photonics Research. 8, 3, p. 318-324 7 p.

Research output: Contribution to journalArticle

Open Access
File
  • 2 Downloads (Pure)

    Thermally tuneable integrated diamond micro-disk resonators fabricated by micro-assembly

    Hill, P., Klitis, C., Guilhabert, B., Sorel, M., Gu, E., Dawson, M. D. & Strain, M. J., 25 Apr 2019, (Accepted/In press). 2 p.

    Research output: Contribution to conferenceSpeech

    Open Access
    File
  • 16 Downloads (Pure)

    Thesis

    Heterogenous integration of diamond with non-native substrates

    Author: Hill, P., 23 Aug 2019

    Supervisor: Gu, E. (Supervisor) & Strain, M. (Supervisor)

    Student thesis: Doctoral Thesis

    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

    • 1 Participation in workshop, seminar, course

    Ross Priory 1st Year Ph.D.Talks

    Paul Hill (Participant)
    17 Aug 2016

    Activity: Participating in or organising an event typesParticipation in workshop, seminar, course