Removing image artefacts in wire array metamaterials

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The new paper by Samiul Habib et al. from the Sydney metamaterial fibers group presents a comprehensive overview of how to remove imaging artefacts when using wire media for sub-wavelength imaging. This is particularly important for using these hyperlenses as broadband subwavelength imaging devices. Three methods are presented based on convolution, field averaging, and power averaging. A technique relying on a projection in spatial Fourier space to filter out all ordinary waves overcomes the distortions we observed in our Scientific Reports paper from last year when imaging large objects with sub-wavelength features. The images above were obtained using my Python code – contact me if you might be interested in using it!

Md. S. Habib, A. Tuniz, K. J. Kaltenecker, Q. Chateiller, I. Perrin, S. Atakaramians, S. C. Fleming, A. Argyros, and B. T. Kuhlmey, “Removing image artefacts in wire array metamaterials”, Optics Express 24, 17989-18002 (2016).

Heading to Frontiers in Optics

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My oral presentation has been sessioned at the Frontiers in Optics/Laser Science Conference (FiO/LS), which will be held at the Rochester Riverside Convention Center, Rochester, New York from 17-21 October 2016. For those interested in attending, details are below:

PRESENTATION INFORMATION
Presentation Number: FW3E.4
Presentation Time: 2:15 PM to 2:30 PM
Session Time and Dates: October 19, 2016 from 1:00 PM to 2:30 PM
Session Title: Plasmonics

Glad to have the opportunity to present some of our latest experimental work on fiber-integrated gold-nanotips! Hope to see you there!

Humans: an Unauthorised Biography

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My parents have just published a book with Springer: “Humans: an Unauthorised Biography”. It’s an excellent, insightful, friendly volume on our species, covering anthropological, scientific and economic aspects of what it means to be human – definitely worth a read! I read some early drafts and provided some thoughts and feedback, which earned me a thank you in the Acknowledgements for my “merciless criticism”…

Based on the latest scientific discoveries, this “unauthorized biography” of the Humans recounts the story of our distant ancestors during the past 6 million years, since the line of our extended family separated from that leading to modern chimpanzees. The book explains how different species evolved, both anatomically and cognitively, and describes the impacts of climatic and environmental change on this process. It also explores the nature of relationships within and between species, describes their everyday lives, and discusses how isolated individuals became members of larger social groups. The concluding chapters highlight the paramount importance of the emergence of symbolic thought and discuss its contribution to the formation of institutions, societies, and economies. The multifaceted picture that emerges will help the reader to make sense not only of “what we were”, but also of “what we are”, here and now. The book is both entertaining and rigorous in integrating results from a wide selection of disciplines. It will be particularly suitable for people with a curious and open mind, keen to overcome long-standing prejudices on man’s place in nature.

New paper online: tailored loss discrimination in metamaterial hollow core fibers

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Combining the idea of metamaterial fibers developed at the University of Sydney, with recent work on modal selectivity in gold-nanowire enhanced optical fibers  performed at IPHT Jena, we have shown that large-area hollow core fibers with sub-wavelength gold nanowires in the cladding can exhibit peculiar properties. In particular, by changing the filling fraction of metal, we can vary which mode has the lowest loss. Interestingly, some of the modes have much lower losses than equivalent modes in fibers made with the individual constituent materials. Furthermore, simple scattering matrix parameter retrieval techniques give an adequate description of the modal losses, which simplifies the design procedure. This was shown at an example CO2 laser wavelength, but is applicable at other wavelengths.

For the full paper, see: A. Tuniz et al., “Tailored loss discrimination in indefinite metamaterial-clad hollow-core fibers”, Opt. Express 24, 15702-15709 (2016)

Lindau Nobel Laureate Meeting

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(photo courtesy of Filippo Caruso)

Just got back from one week at the Lindau Nobel Laureate Meeting. What a week! It was a unique opportunity to engage with some of the world’s best young (and older) scientists. Some of the highlights include the panel discussing the standard model (with a live video stream direct from CERN), quantum computing (it’s a long way away, but that doesn’t matter), and the Bavarian evening (music and merriment). It was also quite incredible to hear Roy Glauber talk about his times as an 18-year-old working on the Manhattan project. Stefan Hell told us about his journey to reinvigorating a century-old field with his invention of sub-diffraction far-field microscopy, and Steven Chu gave some insight into the pathways for a sustainable future. I could go on for quite a while – since every single person talking had a fascinating story to tell. Here I am holding Klaus von Klitzing’s Nobel prize. He told us this was one way to get the prize!