Head of Department
Tel: +44 (0) 1225 383042
http://people.bath.ac.uk/pysjck/
Prof Jonathan Knight
Profile
I am interested in light – how we can explain it, make it, and use it. In particular, how modern technology enables us to fabricate wavelength-scale structures which are then synthetic optical materials with previously unimaginable properties. Much of my time has been spent on developing photonic crystal fibres – a new technology for fibre design which has enabled new capabilities in fibre optics, and led to applications in areas as diverse as new light sources, high power laser delivery, and atomic physics. I work in the Centre for Photonics and Photonic Materials, within which we run a high-specification fibre fabrication area so that we can make and test new structures. I work closely with external partners including both Universities and Industry. Since arriving at Bath in 1996 I have been involved in many aspects of teaching and administration, and am currently Head of the Department of Physics. I am a Fellow of the Optical Society of America.
Publications
Urich, A., Maier, R.R.J., Knight, J.C., Yu, F., Hand, D.P. and Shephard, J.D., 2013. Flexible delivery of Er:YAG radiation at 2.94 μm with novel hollow-core silica glass fibres : Demonstration of tissue ablation. Proceedings of SPIE, 8576, 857608.
Chapman, B.H., Doronkin, A.V., Stone, J.M., Knight, J.C., Popov, S.V. and Taylor, J.R., 2013. Femtosecond pulses at 20 GHz repetition rate through spectral masking of a phase modulated signal and nonlinear pulse compression. Optics Express, 21 (5), pp. 5671-5676.
De Oliveira, R.E.P., Knight, J.C., Taru, T. and De Matos, C.J.S., 2013. Temperature response of an all-solid photonic bandgap fiber for sensing applications. Applied Optics, 52 (7), pp. 1461-1467.
Urich, A., Maier, R.R.J., Yu, F., Knight, J. C., Hand, D.P. and Shephard, J.D., 2013. Flexible delivery of Er:YAG radiation at 2.94 μm with negative curvature silica glass fibers: A new solution for minimally invasive surgical procedures. Biomedical Optics Express, 4 (2), pp. 193-205.
Urich, A., Maier, R.R.J., Yu, F., Knight, J.C., Hand, D.P. and Shephard, J.D., 2013. Forthcoming. Silica hollow core microstructured fibres for mid-infrared surgical applications. Journal of Non-Crystalline Solids
Stone, J.M. and Knight, J.C., 2012. From zero dispersion to group index matching: How tapering fibers offers the best of both worlds for visible supercontinuum generation. Optical Fiber Technology, 18 (5), pp. 315-321.
Yu, F., Wadsworth, W. J. and Knight, J. C., 2012. Low loss silica hollow core fibers for 3–4 μm spectral region. Optics Express, 20 (10), pp. 11153-11158.
Ding, W., Staines, O. K., Hobbs, G. D., Gorbach, A. V., De Nobriga, C., Wadsworth, W. J., Knight, J. C., Skryabin, D. V., Strain, M. J., Sorel, M. and De La Rue, R. M., 2012. Modulational instability in a silicon-on-insulator directional coupler: Role of the coupling-induced group velocity dispersion. Optics Letters, 37 (4), pp. 668-670.
Urich, A., Maier, R. R. J., Mangan, B. J., Renshaw, S., Knight, J. C., Hand, D. P. and Shephard, J. D., 2012. Delivery of high energy Er:YAG pulsed laser light at 2.94ím through a silica hollow core photonic crystal fibre. Optics Express, 20 (6), pp. 6677-6684.
Urich, A., Maier, R. R. J., Knight, J. C., Mangan, B. J., Renshaw, S., Hand, D. P. and Shepharda, J. D., 2012. Fabrication of silica hollow core photonic crystal fibres for Er:YAG surgical applications. Proceedings of SPIE - The International Society for Optical Engineering, 8218, 821805.
Wadsworth, W. J., Knight, J. and Birks, T., 2012. State-of-the-art photonic crystal fiber. Optics and Photonics News, 23 (3), pp. 24-31.
Gris-Sanchez, I. and Knight, J.C., 2012. Time-dependent degradation of photonic crystal fiber attenuation around OH absorption wavelengths. Journal of Lightwave Technology, 30 (23), pp. 3597-3602.
Lehmann, H., Bartelt, H., Willsch, R., Amezcua-Correa, R. and Knight, J. C., 2011. In-line gas sensor based on a photonic bandgap fiber with laser-drilled lateral microchannels. IEEE Sensors Journal, 11 (11), pp. 2926-2931.
Dekker, S. A., Judge, A. C., Pant, R., Gris Sanchez, I., Knight, J. C., de Sterke, C. M. and Eggleton, B. J., 2011. Highly-efficient, octave spanning soliton self-frequency shift using a specialized photonic crystal fiber with low OH loss. Optics Express, 19 (18), pp. 17766-17773.
Hooper, L. E., Mosley, P. J., Muir, A. C., Yu, F., Mangan, B. J., Wadsworth, W. J., Knight, J. C. and Dudley, J. M., 2011. Coherent widely tunable source of sub-picosecond pulses using all-normal dispersion fiber supercontinuum. In: 2011 7th International Workshop on Fibre and Optical Passive Components, WFOPC2011. Piscataway, NJ: IEEE.
Brustlein, S., Berto, P., Hostein, R., Ferrand, P., Billaudeau, C., Marguet, D., Muir, A., Knight, J. and Rigneault, H., 2011. Double-clad hollow core photonic crystal fiber for coherent Raman endoscope. Optics Express, 19 (13), pp. 12562-12568.
Ding, W., Gorbach, A. V., Staines, O. K., De Nobriga, C. E., Hobbs, G. D., Wadsworth, W. J., Knight, J. C., Skryabin, D. V., Samarelli, A., Sorel, M. and De La Rue, R. M., 2011. Spatio-temporal nonlinear optics in arrays of subwavelength waveguides. In: 2011 Conference on Lasers and Electro-Optics: Laser Science to Photonic Applications, CLEO 2011. Piscataway, NJ: IEEE Computer Society.
Ding, W., Gorbach, A. V., Wadsworth, W. J., Knight, J. C., Skryabin, D. V., Strain, M. J., Sorel, M. and De La Rue, R. M., 2011. Time- and frequency-domain measurements of solitons in subwavelength silicon waveguides using cross-correlation. In: 2011 Conference on Lasers and Electro-Optics: Laser Science to Photonic Applications, CLEO 2011. Piscataway, NJ: IEEE Computer Society.
Hooper, L. E., Mosley, P. J., Muir, A. C., Wadsworth, W. J. and Knight, J. C., 2011. Coherent supercontinuum generation in photonic crystal fiber with all-normal group velocity dispersion. Optics Express, 19 (6), pp. 4902-4907.
Dekker, S. A., Judge, A. C., Pant, R., Gris Sanchez, I., Knight, J. C., De Sterke, C. M. and Eggleton, B. J., 2011. 2.04 μm light generation from a Ti:Sapphire laser using a Photonic Crystal Fiber with low OH loss. In: Quantum Electronics Conference & Lasers and Electro-Optics (CLEO/IQEC/PACIFIC RIM), 2011. IEEE, pp. 522-524.
Knight, J., 2011. Photonic crystal and microstructured fibers: Making fibers better by leaving bits out. In: 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2011. Piscataway, NJ: IEEE Computer Society.
Gris-Sanchez, I., Mangan, B. J. and Knight, J. C., 2011. Reducing spectral attenuation in small-core photonic crystal fibers. Optical Materials Express, 1 (2), pp. 179-184.
Gorbach, A. V., Ding, W., Staines, O. K., De Nobriga, C. E., Hobbs, G. D., Wadsworth, W. J., Knight, J. C., Skryabin, D. V., Samarelli, A., Sorel, M. and De La Rue, R. M., 2011. Spatiotemporal nonlinear optics in arrays of subwavelength waveguides. In: 2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC). Piscataway, NJ: IEEE.
Mosley, P. J., Huang, W. C., Welch, M. G., Mangan, B. J., Wadsworth, W. J. and Knight, J. C., 2010. Ultrashort pulse compression and delivery in a hollow-core photonic crystal fiber at 540 nm wavelength. Optics Letters, 35 (21), pp. 3589-3591.
Gorbach, A. V., Ding, W., Staines, O. K., De Nobriga, C. E., Hobbs, G. D., Wadsworth, W. J., Knight, J. C., Skryabin, D. V., Samarelli, A., Sorel, M. and De La Rue, R. M., 2010. Spatiotemporal nonlinear optics in arrays of subwavelength waveguides. Physical Review A - Atomic, Molecular, and Optical Physics, 82 (4), 041802.
Estudillo-Ayala, J. M., Mangan, B. J., Wadsworth, W. J. and Knight, J. C., 2010. Coupling efficiency and transmission through hollow-core photonic bandgap fibers. Proceedings of SPIE - The International Society for Optical Engineering, 7839, 78391j.
Lavoute, L., Knight, J. C., Dupriez, P. and Wadsworth, W. J., 2010. High power red and near-IR generation using four wave mixing in all integrated fibre laser systems. Optics Express, 18 (15), pp. 16193-16205.
Mangan, B. J., Muir, A. C. and Knight, J. C., 2010. Photonic bandgap fiber with multiple hollow cores. Journal of Lightwave Technology, 28 (9), pp. 1287-1290.
Pureur, V., Knight, J. C. and Kuhlmey, B. T., 2010. Higher order guided mode propagation in solid-core photonic bandgap fibers. Optics Express, 18 (9), pp. 8906-8915.
Aref, S. H., Amezcua Correa, R., Carvalho, J. P., Frazao, O., Santos, J. L., Araujo, F. M., Latifi, H., Farahi, F., Ferreira, L. A. and Knight, J. C., 2010. Spectral characterization of a photonic bandgap fiber for sensing applications. Applied Optics, 49 (10), pp. 1870-1875.
Shum, P. P., Knight, J. C., Lægsgaard, J. and Hu, D. J. J., 2010. Optical fiber-based devices and applications. Frontiers of Optoelectronics in China, 3 (1), p. 1.
Gris-Sanchez, I., Mangan, B. J. and Knight, J., 2010. Reducing spectral attenuation in solid-core photonic crystal fibers. In: 2010 Conference on Optical Fiber Communication, Collocated National Fiber Optic Engineers Conference, OFC/NFOEC 2010. IEEE Computer Society.
Knight, J.C., 2010. What do you see in photonic crystal fibers? Frontiers of Optoelectronics in China, 3 (1), pp. 2-8.
Beltran-Mejia, F., Chesini, G., Silvestre, E., George, A. K., Knight, J. C. and Cordeiro, C. M. B., 2010. Ultrahigh-birefringent squeezed lattice photonic crystal fiber with rotated elliptical air holes. Optics Letters, 35 (4), pp. 544-546.
Hooper, L. E., Mosley, P. J., Muir, A. C., Wadsworth, W. J. and Knight, J. C., 2010. All-normal dispersion photonic crystal fiber for coherent supercontinuum generation. In: Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010. New York: Association for Computing Machinery (ACM).
De Nobriga, C. E., Hobbs, G. D., Wadsworth, W. J., Knight, J. C., Skryabin, D. V., Samarelli, A., Sorel, M. and De La Rue, R. M., 2010. Supermode dispersion and waveguide-to-slot mode transition in arrays of silicon-on-insulator waveguides. Optics Letters, 35 (23), pp. 3925-3927.
De Nobriga, C. E., Wadsworth, W. J., Gorbach, A. V., Skryabin, D. V., Knight, J. C., Samarelli, A., Sorel, M. and De La Rue, R. M., 2010. Supermode dispersion of strongly coupled silicon-on-insulator waveguides. In: Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010. New York: Association for Computing Machinery (ACM).
Ding, W., Gorbach, A. V., Wadsworth, W. J., Knight, J. C., Skryabin, D., Strain, M. J., Sorel, M. and De la Rue, R. M., 2010. Time and frequency domain measurements of solitons in subwavelength silicon waveguides using a cross-correlation technique. Optics Express, 18 (25), pp. 26625-26630.
Huang, W., Welch, M. G., Mosley, P. J., Mangan, B. J., Wadsworth, W. J. and Knight, J. C., 2010. Ultrashort pulse delivery in hollow-core photonic bandgap fiber at 540 nm. In: Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010. New York: Association for Computing Machinery (ACM).
Knight, Jonathan, 2009. A source of optical supercontinuum radiation. G02B6/02P6K2-W02009098519 (A1), 13 August 2009.
Lim, J., Knabe, K., Tillman, K. A., Neely, W., Wang, Y., Amezcua-Correa, R., Couny, F., Light, P. S., Benabid, F., Knight, J. C., Corwin, K. L., Nicholson, J. W. and Washburn, B. R., 2009. A phase-stabilized carbon nanotube fiber laser frequency comb. Optics Express, 17 (16), pp. 14115-14120.
Lazaro, J. M., Kuhlmey, B. T., Knight, J. C., Lopez-Higuera, J. M. and Eggleton, B. J., 2009. Ultrasensitive UV-tunable grating in all-solid photonic bandgap fibers. Optics Communications, 282 (12), pp. 2358-2361.
Welch, M., Cook, K., Correa, R. A., Gerome, F., Wadsworth, W., Gorbach, A., Skryabin, D. and Knight, J., 2009. Solitons in Hollow Core Photonic Crystal Fiber: Engineering Nonlinearity and Compressing Pulses. Journal of Lightwave Technology, 27 (11), pp. 1644-1652.
Welch, M. G., De Nobriga, C. E., Correa, R. A., Wadsworth, W. J. and Knight, J. C., 2009. Accurate measurement of the dispersion of hollow-core fibers using a scalable technique. Optics Express, 17 (11), pp. 9006-9012.
Chesini, G., Cordeiro, C. M. B., de Matos, C. J. S., Fokine, M., Carvalho, I. C. S. and Knight, J. C., 2009. All-fiber devices based on photonic crystal fibers with integrated electrodes. Optics Express, 17 (3), pp. 1660-1665.
Tzeng, Y. W., Lin, Y. Y., Huang, C. H., Liu, J. M., Chui, H. C., Liu, H. L., Stone, J. M., Knight, J. C. and Chu, S. W., 2009. Broadband tunable optical parametric amplification from a single 50 MHz ultrafast fiber laser. Optics Express, 17 (9), pp. 7304-7309.
Nandi, P., Chen, Z., Witkowska, A., Wadsworth, W. J., Birks, T. A. and Knight, J. C., 2009. Characterization of a photonic crystal fiber mode converter using low coherence interferometry. Optics Letters, 34 (7), pp. 1123-1125.
Yao, L., Birks, T. A. and Knight, J. C., 2009. Low bend loss in tightly-bent fibers through adiabatic bend transitions. Optics Express, 17 (4), pp. 2962-2967.
Aref, S. H., Amezcua Correa, R., Carvalho, J. P., Frazao, O., Caldas, P., Santos, J. L., Araujo, F. M., Latifi, H., Farahi, F., Ferreira, L. A. and Knight, J. C., 2009. Modal interferometer based on hollow-core photonic crystal fiber for strain and temperature measurement. Optics Express, 17 (21), pp. 18669-18675.
Dupriez, P., Gerome, F., Knight, J. C., Clowes, J. and Wadsworth, W. J., 2009. Tunable High-energy femtosecond soliton fiber laser based on hollowcore photonic bandgap fiber. Proceedings of SPIE - The International Society for Optical Engineering, 7195, 719511.
Reid, D. T., Kornaszewski, L. W., Muller, T. P., Gayraud, N., MacPherson, W. N., Hand, D. P., Stone, J. M. and Knight, J. C., 2009. Ultrafast optical parametric oscillators for spectroscopy. In: Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7193. SPIE, p. 719325.
Domachuk, P., Wolchover, N. A., Cronin-Golomb, M., Wang, A., George, A. K., Cordeiro, C. M. B., Knight, J. C. and Omenetto, F. G., 2008. Over 4000 nm bandwidth of mid-IR supercontinuum generation in sub-centimeter segments of highly nonlinear tellurite PCFs. Optics Express, 16 (10), pp. 7161-7168.
Hou, J., Bird, D. M., George, A., Maier, S., Kuhlmey, B. and Knight, J., 2008. Metallic mode confinement in microstructured fibres. Optics Express, 16 (9), pp. 5983-5990.
Stone, J. M. and Knight, J. C., 2008. Visibly "white" light generation in uniform phototonic crystal fiber using a microchip laser. Optics Express, 16 (4), pp. 2670-2675.
Stone, J. M. and Knight, J. C., 2008. Visibly “white” light generation in uniform photonic crystal fiber using a microchip laser. Optics Express, 16 (4), pp. 2670-2675.
Cook, K., Welch, M. G., Gerome, F., George, A. K., Wadsworth, W. J. and Knight, J. C., 2008. Compression of picosecond optical pulses in tapered hollow-core photonic bandgap fiber. In: 2008 Conference on Lasers and Electro-Optics & Quantum Electronics and Laser Science Conference. Vol. 1-9. IEEE, pp. 1977-1978.
Amezcua-Correa, R., Leon-Saval, S. G., Gerome, F., Birks, T. and Knight, J., 2008. Control of surface modes in hollow-core bandgap fibers. In: Photonic Crystal Fibers II, 2008-04-09, Strasbourg.
Amezcua Correa, R., Gerome, R., Leon-Saval, S., Broderick, N. G. R., Birks, T. A. and Knight, J. C., 2008. Control of surface modes in low loss hollow-core photonic bandgap fibers. Optics Express, 16 (2), pp. 1142-1149.
Kuhlmey, B. T., Luan, F., Fu, L., Yeom, D. I., Eggleton, B. J., Wang, A. and Knight, J., 2008. Experimental reconstruction of bands in solid core photonic bandgap fibres using acoustic gratings. Optics Express, 16 (18), pp. 13845-13856.
Knight, J., 2008. Optics in Microstructured and Photonic Crystal Fibers. In: Corderiro, C. M. B. and DeMatos, C. J. S., eds. 1st Workshop on Specialty Optical Fibers and Their Applications, 2008-01-01, Sao Pedro.
Sidorov-Biryukov, D. A., Fernandez, A., Zhu, L., Verhoef, A., Dombi, P., Pugzlys, A., Serebryannikov, E. E., Zheltikov, A. M., Knight, J. and Baltuška, A., 2008. Solitonic dynamics of ultrashort pulses in a highly nonlinear photonic-crystal fiber visualized by spectral interferometry. Optics Letters, 33 (5), pp. 446-448.
Ding, W., Benton, C., Gorbach, A. V., Wadsworth, W. J., Knight, J. C., Skryabin, D. V., Gnan, M., Sorrel, M. and De La Rue, R. M., 2008. Solitons and spectral broadening in long silicon-on-insulator photonic wires. Optics Express, 16 (5), pp. 3310-3319.
Welch, M., Correa, R. A., Gerome, F., Renshaw, S. and Knight, J., 2008. Tailoring the Nonlinear Response of Hollow-core Photonic Bandgap Fibres. In: Corderiro, C. M. B. and DeMatos, C. J. S., eds. 1st Workshop on Specialty Optical Fibers and their Applications. Vol. 1055. AIP, pp. 54-57.
Ostermeyer, M., Kong, H. J., Kovalev, V. I., Harrison, R. G., Fotiadi, A. A., Mégret, P., Kalal, M., Slezak, O., Yoon, J. W., Shin, J. S., Beak, D. H., Lee, S. K., Lü, Z., Wang, S., Lin, D., Knight, J., Kotova, N. E., Sträßer, A., Scheikh-Obeid, A., Riesbeck, T., Meister, S., Eichler, H. J., Wang, Y., He, W., Yoshida, H., Fujita, H., Nakatsuka, M., Hatae, T., Park, H., Lim, C., Omatsu, T., Nawata, K., Shiba, N., Antipov, O. L., Kuznetsov, M. S. and Zakharov, N. G., 2008. Trends in stimulated Brillouin scattering and optical phase conjugation. Laser and Particle Beams, 26 (03), pp. 297-362.
Stone, J. M., Knight, J. C. and Clowes, J., 2008. Visibly "white" light generation in uniform photonic crystal fiber using a microchip laser. In: 2008 Conference on Lasers and Electro-Optics & Quantum Electronics and Laser Science Conference. Vol. 1-9. IEEE, pp. 706-707.
