Imperial College London

Dr Kenny Weir

Faculty of Natural SciencesDepartment of Physics

Reader in Photonics
 
 
 
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Contact

 

+44 (0)20 7594 7501k.weir Website

 
 
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Location

 

900CBlackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

46 results found

Boriskina SV, Greanya V, Weir K, 2019, Biomimetic photonics, JOURNAL OF OPTICS, Vol: 21, ISSN: 2040-8978

Journal article

McCall MW, Carter IE, Weir K, 2017, Investigation of the variation of near-circular polarization in Scarabaeoidea beetles, Materials Today: Proceedings, Vol: 4, Pages: 4942-4951, ISSN: 2214-7853

Variation in the reflection of circularly polarized light (CP) of a substantial number of beetles, of both the Hybosoridae and Scarabaeidae families, is discussed. Classifications of the spectral shapes were made for Cetonia aurata aurata beetles, which were related to variations within the chiral chitin structure and have been computationally modelled. It was seen that single peaked spectra were not the predominant spectral shape and that more complex structures are responsible for the spectra observed. Two structural perturbations methods to the single pitched structure are proposed to be responsible for the more complex spectral shapes. Further CP analysis of the genus rutelinae:Chrysina was undertaken with variations in broadband reflection observed within the optima species.

Journal article

Carter IE, Weir K, McCall MW, Parker ARet al., 2016, Variation in the circularly polarized light reflection of Lomaptera (Scarabaeidae) beetles, Journal of the Royal Society Interface, Vol: 13, ISSN: 1742-5689

An extended spectroscopic study on the left-through-left circularly polarised reflection spectra of a large number of beetles from the Australasian Scrabaeidae:Cetoniinae of the Lomaptera genus was undertaken. We have obtained a five-category spectral classification.The principal spectral features, which even within the genus range from blue to infra-red, are related to structural chirality in the beetle shells. The detailed features of each spectral classification are related to different structural perturbations of the helix including various pitch values and abrupt twist defects. These spectral characteristics and associated shell structures are confirmed on the basis of simple modelling. An important conclusion from our study is that the simple helical structure resulting in a single symmetric Bragg peak is not thedominant spectral type. Rather the reality is a rich tapestry of spectral types. One intriguing specimen is identified via an SEM micrograph to consist of a double interstitial helix leadingto a particular double-peak spectrum.

Journal article

Amrania H, Drummond L, Coombes RC, Shousha S, Woodley-Barker L, Weir K, Hart W, Carter I, Phillips CCet al., 2016, New IR imaging modalities for cancer detection and for intra-cell chemical mapping with a sub-diffraction mid-IR s-SNOM, Faraday Discussions, Vol: 187, Pages: 539-553, ISSN: 1364-5498

We present two new modalities for generating chemical maps. Both are mid-IR based and aimed at the biomedical community, but they differ substantially in their technological readiness. The first, so-called "Digistain", is a technologically mature "locked down" way of acquiring diffraction-limited chemical images of human cancer biopsy tissue. Although it is less flexible than conventional methods of acquiring IR images, this is an intentional, and key, design feature. It allows it to be used, on a routine basis, by clinical personnel themselves. It is in the process of a full clinical evaluation and the philosophy behind the approach is discussed. The second modality is a very new, probe-based "s-SNOM", which we are developing in conjunction with a new family of tunable "Quantum Cascade Laser" (QCL) diode lasers. Although in its infancy, this instrument can already deliver ultra-detailed chemical images whose spatial resolutions beat the normal diffraction limit by a factor of ∼1000. This is easily enough to generate chemical maps of the insides of single cells for the first time, and a range of new possible scientific applications are explored.

Journal article

Weir K, Williamson A, 2005, Optics keeps your options open, PHYSICS WORLD, Vol: 18, Pages: 50-50, ISSN: 0953-8585

Journal article

Mondanos M, Giles I, Weir K, 2005, Fibre optic polarimetric temperature sensor using low coherence source employing intensity and wavelength compensation, Bellingham, WA, 17th international conference on optical fibre sensors, Brugge, Belgium, 23 - 27 May 2005, Publisher: SPIE - International Society for Optical Engineering, Pages: 647-650

Conference paper

Weir K, 2004, Detectors, Handbook of laser technology and applications, Editors: Webb, Jones, Bristol, Publisher: IOP, Pages: 1509-1522, ISBN: 9780750309639

Book chapter

Meggitt BT, Hall CJ, Weir K, 2000, An all fibre white light interferometric strain measurement system, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 79, Pages: 1-7, ISSN: 0924-4247

Journal article

McCall M, Weir K, 2000, Bragg gratings, photosensitivity, and poling in glass waveguides, Topical Meeting on Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides (BGPP 99), Publisher: OPTICAL SOC AMERICA, Pages: 116-118, ISSN: 1094-5695

Conference paper

Mondanos M, Lloyd PA, Giles IP, Badcock RA, Weir Ket al., 2000, Damage detection in composite structures using polarimetric low coherence interferometry, 14th International Conference on Optical Fiber Sensors, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, Pages: 760-763, ISSN: 0277-786X

Conference paper

Dupray V, Zeller M, Zhang W, Williams J, Weir K, McCall Met al., 2000, Novel UV post-processed fibre Bragg grating sensor for temperature and strain measurements, 14th International Conference on Optical Fiber Sensors, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, Pages: 9-12, ISSN: 0277-786X

Conference paper

Weir K, Jones JDC, 2000, Optical detectors and receivers, Optical fiber sensor technology : fundamentals, Boston, Publisher: Kluwer Academic, ISBN: 9780792378525

Book chapter

Yupapin PVP, Chitaree R, Palmer AW, Grattan KTV, Weir Ket al., 1998, Dynamic measurement of thin liquid film parameters using high-speed ellipsometry, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 65, Pages: 19-22, ISSN: 0924-4247

Journal article

Gebremichael YM, Palmer AW, Grattan KTV, Weir Ket al., 1998, Dynamic oil film thickness measurements using a Hi-Bi fibre optic based polarization modulation ellipsometer., Applied Optics Divisional Conference of the Institute of Physics, Publisher: IOP PUBLISHING LTD, Pages: 169-174

Conference paper

Hall CJ, Weir K, 1997, Enhanced dynamic range in polarisation insensitive all-fibre low coherence sensing, 8th Conference on Sensors and Their Applications, Pages: 257-262

The application of an all-fibre processing interferometer to low-coherence sensing systems is investigated. A fibre optic Michelson interferometer is phase-modulated by two piezo-tubes identically coiled with fibre and driven by a common 400Vpk-pk sawtooth signal, providing a range >1mm and dynamically compensating for polarisation induced effects. A laser source is used to provide fringe timing information which is used to apply an interpolating digital filter which effectively enhances the dynamic range.

Conference paper

Hall CJ, Weir K, 1997, Enhanced dynamic range in polarisation insensitive all-fibre low coherence sensing, Sensors and Their Applications Viii, Pages: 257-262

Journal article

Chitaree R, Weir K, Murphy V, Palmer AW, Grattan KTV, MacCraith BDet al., 1995, An optical-fibre ellipsometer for applications in thin-film sensor systems, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 50, Pages: 45-53, ISSN: 0924-4247

Journal article

YUPAPIN PVP, WEIR K, GRATTAN KTV, PALMER AWet al., 1995, A STUDY OF POLARIZATION-MAINTAINING FIBER CHARACTERISTICS WITH APPLICATIONS TO FORCE AND DISPLACEMENT SENSING, JOURNAL OF LASER APPLICATIONS, Vol: 7, Pages: 89-97, ISSN: 1042-346X

Journal article

WANG DN, NING YN, PALMER AW, GRATTAN KTV, WEIR Ket al., 1995, AN ALTERNATIVE TO WHITE-LIGHT INTERFEROMETRIC SENSING, JOURNAL OF LIGHTWAVE TECHNOLOGY, Vol: 13, Pages: 961-966, ISSN: 0733-8724

Journal article

WANG DN, NING YN, PALMER AW, GRATTAN KTV, WEIR Ket al., 1995, Multi-wavelength combination source - A novel technique for white light interferometry, International Conference on Applications of Photonic Technology, Sensing, Signal Processing, and Communications, Publisher: PLENUM PRESS DIV PLENUM PUBLISHING CORP, Pages: 373-377

Conference paper

CHITAREE R, MURPHY V, WEIR K, PALMER AW, GRATTAN KTV, MACCRAITH BDet al., 1995, Ellipsometric measurements for thin film based sensor systems, Conference on Smart Structures - Optical Instrumentation and Sensing Systems, Publisher: SPIE - INT SOC OPTICAL ENGINEERING, Pages: 72-78

Conference paper

NING YN, WANG Q, PALMER AW, GRATTAN KTV, MEGGITT BT, WEIR Ket al., 1995, Novel signal processing scheme for enhancing the central fringe in a white light interferometer, 7th Conference on Sensors and Their Applications, Publisher: IOP PUBLISHING LTD, Pages: 149-154

Conference paper

WEIR K, PALMER AW, GRATTAN KTV, 1995, An optical fibre linear position sensor with centimetre scan utilising white light interferometry and two light sources of widely separated wavelengths, International Conference on Applications of Photonic Technology, Sensing, Signal Processing, and Communications, Publisher: PLENUM PRESS DIV PLENUM PUBLISHING CORP, Pages: 379-382

Conference paper

Chitaree R, Weir K, Murphy V, Palmer AW, Grattan KTV, MacCraith BDet al., 1995, A fibre optic based ellipsometer for thin film based sensor systems, Sensors and Their Applications Vii, Pages: 212-217

Journal article

CHITAREE R, WEIR K, MURPHY V, PALMER AW, GRATTAN KTV, MACCRAITH BDet al., 1995, A fibre optic based ellipsometer for thin film based sensor systems, 7th Conference on Sensors and Their Applications, Pages: 212-217

Conference paper

NING YN, GRATTAN KTV, PALMER AW, WEIR Ket al., 1994, MEASUREMENT OF UP-LEAD AND DOWN-LEAD FIBER SENSITIVITY CAUSED BY THE LEAD IN A MULTIMODE FIBER IN AN INTERFEROMETRIC SYSTEM, APPLIED OPTICS, Vol: 33, Pages: 7529-7535, ISSN: 0003-6935

Journal article

WANG DN, NING YN, GRATTAN KTV, PALMER AW, WEIR Ket al., 1994, OPTIMIZED MULTIWAVELENGTH COMBINATION SOURCES FOR INTERFEROMETRIC USE, APPLIED OPTICS, Vol: 33, Pages: 7326-7333, ISSN: 0003-6935

Journal article

WEIR K, PALMER AW, GRATTAN KTV, 1994, ACCURATE MEASUREMENT OF SMALL DISPLACEMENT USING OPTICAL TECHNIQUES, INTERNATIONAL JOURNAL OF OPTOELECTRONICS, Vol: 9, Pages: 449-455, ISSN: 0952-5432

Journal article

CHITAREE R, WEIR K, PALMER AW, GRATTAN KTVet al., 1994, A HIGHLY BIREFRINGENT FIBER POLARIZATION MODULATION SCHEME FOR ELLIPSOMETRY - SYSTEM-ANALYSIS AND PERFORMANCE, MEASUREMENT SCIENCE AND TECHNOLOGY, Vol: 5, Pages: 1226-1232, ISSN: 0957-0233

Journal article

WANG DN, NING YN, PALMER AW, GRATTAN KTV, WEIR Ket al., 1994, AN OPTICAL-SCANNING TECHNIQUE IN A WHITE-LIGHT INTERFEROMETRIC SYSTEM, IEEE PHOTONICS TECHNOLOGY LETTERS, Vol: 6, Pages: 855-857, ISSN: 1041-1135

Journal article

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