Tag Archives: Jonathan Hall

Generating whispering gallery mode spectra

9 March 2017:

A new publication from CNBP researchers (lead author Jonathan Hall pictured) presents a new model for generating whispering gallery mode spectra for multilayer microspheres.

The work has just been reported in the journal ‘Optics Express’ and is accessible online.

Journal: Optics Express.

Title: Unified theory of whispering gallery multilayer microspheres with single dipole or active layer sources.

Authors: Jonathan M. M. Hall, Tess Reynolds, Matthew R. Henderson, Nicolas Riesen, Tanya M. Monro, and Shahraam Afshar.

Abstract: The development of a fast and reliable whispering gallery mode (WGM) simulator capable of generating spectra that are comparable with experiment is an important step forward for designing microresonators. We present a new model for generating WGM spectra for multilayer microspheres, which allows for an arbitrary number of concentric dielectric layers, and any number of embedded dipole sources or uniform distributions of dipole sources to be modeled. The mode excitation methods model embedded nanoparticles, or fluorescent dye coatings, from which normalized power spectra with accurate representation of the mode coupling efficiencies can be derived. In each case, the emitted power is expressed conveniently as a function of wavelength, with minimal computational load. The model makes use of the transfer-matrix approach, incorporating improvements to its stability, resulting in a reliable, general set of formulae for calculating whispering gallery mode spectra. In the specific cases of the dielectric microsphere and the single-layer coated microsphere, our model simplifies to confirmed formulae in the literature.

eChallenge success!

echallenge3sq18 November 2016:

Team ‘Life Whisperers’, composed of CNBP researchers from the University of Adelaide, Melanie McDowall and Jonathan Hall, together with their mentor Michelle Perugini have won first prize in both the Medical Innovations and Research Commercialisation categories of the ‘Australian eChallenge’ competition.

Run by the Entrepreneurship, Commercialisation and Innovation Centre (ECIC) at the University of Adelaide, the eChallenge is a competition based learning experience that develops strategic business thinking for early-stage entrepreneurial ventures. Participants pitch their venture concepts to potential investors from the local business community. This year it attracted 152 teams across a number of categories.

The successful ‘Life Whisperers’ team proposed and pitched to judges, a new non-invasive diagnostic product to help improve embryo selection and ultimately improve positive IVF outcomes. In winning both categories, the team won $20,000 ($10,000 per category) with the money able to be used to help support future startup activity.

 Below – Entrepreneur Steven Fang presents Jonathan and Mel with one of their winning cheques.


SPIE West in San Francisco

7-12 February 201Alexandre Francois Low Res Edit 00835: Conference Presentations

Dr Alex Francois and PhD students Tess Reynolds and Jonathan Hall presented three papers at SPIE West

Jonathan Hall, Shahraam Afshar, Matthew Henderon, Alexandre Francois, Tess Reynolds, Nicolas Riesen and Tanya Monro, “Predicting the whispering gallery mode spectra of microresonators,” SPIE LASE, 9343-71 (2015)

Reynolds, A. Francois, M.R. Henderson, S.J. Nicholls, T.M Monro “Optimization of Whispering Gallery Mode sensor design for applications in biosensing,” SPIE BIOS, 9315-19  (2015)

Alexandre François, Nicolas Riesen, Hong Ji, Shahraam Afshar Vahid, Tanya M. Monro “Whispering-gallery mode lasers for biosensing: Reducing the lasing threshold,” SPIE LASE, 9343-66 (2015)