Selected Publications - Dr Kristian Groom

Refereed Journal Papers

P. D. L. Judson, K. M. Groom, D. T. Childs, M. Hopkinson, N. Krstajic, R. A. Hogg.
Maximising Performance of Optical Coherence Tomography systems using a multi-contact chirped Quantum Dot Superluminescent Diode
Microelectronics Journal
2008

M. Groom, R. R. Alexander, D. T. D. Childs, A. B. Krysa, J. S. Roberts, A. S. Helmy, R. A. Hogg.
GaAs-Based Self-Aligned Laser Incorporating InGaP Opto-Electronic Confinement Layer
Electronics Letters
44 (15), pp.905-6, July 2008

B. J. Stevens, D. T. D. Childs, K. M. Groom, M. Hopkinson, R. A. Hogg.
A quantum dot swept laser source based upon a multisection laser device
Japanese Journal of Applied Physics
47 (4), pp.2965-2967, April 2008

R. Beanland, A. M. Sanchez, D. Childs, K. M. Groom, H. Y. Liu, D. J. Mowbray, M. Hopkinson.
Structural analysis of life tested 1.3μm quantum dot lasers
Journal of Applied Physics
103 (1), p.014913, Jan 2008

R. R. Alexander, D. Childs, H. Agarwal, K. M. Groom, H.Y. Liu, M. Hopkinson, R.A. Hogg, M. Ishida, T. Yamamoto, M. Sugawara, Y. Arakawa, T. J. Badcock, D. J. Mowbray
Systematic study of the effects of d-p-doping on 1.3μm quantum dot lasers
IEEE Journal of Quantum Electronics
43 (11- 12), pp.1129-1139, Nov-Dec 2007

S. K. Ray, T. L. Choi, K. M. Groom, B. Stevens, H. Liu, M. Hopkinson, R. A. Hogg
High-Power and Broad-Band Quantum Dot Superluminescent Diodes Centred at 1250nm for Optical Coherence Tomography
IEEE Journal of Selected Topics in Quantum Electronics
13 (5), pp.1267- 1272, Sept-Oct 2007

B. J. Stevens, K. M. Groom, D. C. Childs, M. Hopkinson, R. A. Hogg.
All Semiconductor Swept Laser Source Utilising Quantum Dots
Applied Physics Letters
91 (12), p.121119, Sept 2007.

C. Y. Jin, H. Y. Liu, K. M. Groom, Q. Jiang, M. Hopkinson, T. J. Badcock, R. J. Royce, D. J. Mowbray
Effects of photon and thermal coupling mechanisms on the characteristics of self-assembled InAs/GaAs quantum dot lasers
Physical Review B
76, p.085315, Aug 2007

Z.Y. Zhang, I. J. Luxmoore, C.Y. Jin, H.Y. Liu, Q. Jiang, K. M. Groom, D. T. Childs, M. Hopkinson, A.G. Cullis, R.A. Hogg
Effect of Facet Angle on Quantum Dot Edge Emitting Lasers and Superluminescent Light Emitting Diodes
Applied Physics Letters
91 (8), p.081112, July 2007

Z. Y. Zhang, I. J. Luxmoore, Q. Jiang, H. Y. Liu, K. M. Groom, D. T. Childs, M. Hopkinson, A. G. Cullis, R. A. Hogg
Broadband quantum dot superluminescent LED with angled facet formed by focused ion beam etching
Electronics Letters
43 (10), p.587-89, May 2007

H. Y. Liu, T. J. Badcock, C. Y. Jin, E. Nabavi, K. M. Groom, M. Hopkinson and D. J. Mowbray
Reduced temperature sensitivity of lasing wavelength in near-1.3μm InAs=GaAs quantum dot laser with stepped composition strain-reducing layer
Electronics Letters
43 (12), June 2007

S. K. Ray, H. Y. Liu, T. L. Choi, K. M. Groom, S. Liew, M. Hopkinson, R. A. Hogg
Molecular Beam Epitaxial Growth of High Power Quantum Dot Superluminescent Diodes
Japanese Journal of Applied Physics
46 (4B), p.2418-20, April 2007

R. R. Alexander, D. Childs, H. Agarwal, K. M. Groom, H. Liu, M. Hopkinson, R. A. Hogg
Zero and controllable linewidth enhancement factor in p-doped 1.3μm QD lasers
Japanese Journal of Applied Physics
46 (4B), p2421-23, April 2007

K. Kennedy, D. G. Revin, A. B. Krysa, K. M. Groom, L. R. Wilson, J. W. Cockburn, R. A. Hogg
Fabrication and characterisation of InP-based quantum cascade lateral grating distributed feedback lasers with inductively coupled plasma etched lateral gratings
Japanese Journal of Applied Physics
46 (4B), p.2424-28, April 2007

T. J. Badcock, R. J. Royce, D. J. Mowbray, M. S. Skolnick, H. Y. Liu, M. Hopkinson, K. M. Groom, Q. Jiang
Low threshold current density and negative characteristic temperature 1.3μm InAs selfassembled quantum dot lasers
Applied Physics Letters
90 (11), March 2007

S. K. Ray, T. L. Choi, K. M. Groom, H. Y. Liu, M. Hopkinson, R. A. Hogg
High power 1.3μm quantum dot superluminescent light emitting diode with thin low temperature GaAs spacer layer in the active region
IEEE Photonics Technology Letters
19, (2), p.109-111, Jan 2007

S. K. Ray, K. M. Groom, R. R. Alexander, K. Kennedy, H. Y. Liu, M. Hopkinson, R. A. Hogg
Design, growth, fabrication and characterisation of InAs/GaAs 1.3μm quantum dot broadband superluminescent LEDs
Journal of Applied Physics
100 (10), p.103105, 2006

C. Y. Jin, T. J. Badcock, H. Y. Liu, K. M. Groom, R. J. Royce, D. J. Mowbray, P. M. Smowton, M. Hopkinson
Observation and modelling of a room-temperature negative characteristic temperature 1.3μm p-type modulation doped quantum dot laser
IEEE Journal of Quantum Electronics
42 (12), p. 1259-65, 2006

K. Kennedy, A. B. Krysa, J. S. Roberts, K. M. Groom, D. G. Revin, L. R. Wilson, J. W. Cockburn, R. A. Hogg
High performance InP-based quantum cascade distributed feedback lasers with deeply etched lateral gratings
Applied Physics Letters
89 (20), p. 1117, 2006

S. K. Ray, K. M. Groom, H. Y. Liu, M. Hopkinson, R. A. Hogg
Broad-band superluminescent light emitting diodes incorporating quantum dots in compositionally modulated quantum wells
Japanese Journal of Applied Physics
45, p. 2542-45, 2006

T.J. Badcock, H.Y. Liu, K.M. Groom, C.Y. Jin, M. Gutiérrez, M. Hopkinson, D.J. Mowbray, M.S. Skolnick
1.3 μm InAs/GaAs quantum-dot laser with low-threshold current density and negative characteristic temperature above room temperature
Electronics Letters
42 (16), p.922- 23, August 2006

H. Y. Liu, S. L. Liew, T. Badcock, D. J. Mowbray, M. S. Skolnick, S. K. Ray, T. L. Choi, K. M. Groom, B. Stevens, F. Hasbullah, C. Y. Jin, M. Hopkinson, R. A. Hogg
p-doped 1.3 μm InAs/GaAs quantum-dot laser with a low threshold current density and high differential efficiency
Applied Physics Letters
89 (7), Aug. 2006

K. Kennedy, K. M. Groom, R. A. Hogg
Inductively Coupled Plasma etching of InP gratings, V-grooves, and cleave initiators using SiCl₄/Ar
Semiconductor Science and Technology
21 L1-L5, 2006

S. K. Ray, K. M. Groom, H. Y. Liu, M. Hopkinson, R. A. Hogg
Broad-band superluminescent light emitting diodes incorporating quantum dots in compositionally modulated quantum wells
IEEE Photonics Technology Letters
18 (1-4), p.58-60, 2006

S. Pellegrini, R. E. Warburton, L. J. Tan, J. S. Ng, A. B. Krysa, K. M. Groom, J. P. R. David, S. Cova, M. J. Robertson, G. S. Buller
Design and performance of an InGaAs-InP single-photon avalanche diode detector
IEEE Journal of Quantum Electronics
42(4), p. 397-403, April 2006

E. A. Zibik, W. H. Ng, D. G. Revin, L. R. Wilson, J. W. Cockburn, K. M. Groom, M. Hopkinson
Broadband 6μm < l < 8μm superluminescent quantum cascade light-emitting diodes
Applied Physics Letters
88 (12), March 2006

I. R. Sellers, D. J. Mowbray, T. Badcock, J. P. Wells, P. J. Phillips, D. A. Carder, H. Y. Liu, K. M. Groom, M. Hopkinson
Infrared modulated intrlevel spectroscopy of 1.3μm self-assembled quantum dot lasers using a free electron laser
Applied Physics Letters
88 (8), Feb 2006

S. K. Ray, K. M. Groom, R. A. Hogg, H. Y. Liu, M. Hopkinson, T. J. Badcock, D. J. Mowbray, M. S. Skolnick
Improved temperature performance of 1.31μm quantum dot lasers by optimised ridge waveguide design
IEEE Photonics Technology Letters
17, pp1785-1787, 2005

I. P. Marko, A. R. Adams, S. J. Sweeney, D. J. Mowbray, M. S. Skolnick, H. Y. Liu, K. M. Groom
Recombination and loss mechanisms in low threshold InAs-GaAs 1.3μm quantum-dot lasers
Journal of Selective Topics in Quantum Electronics
11 (5), p.1041-47, Sept 2005

R. J. Young, R. M. Stevenson, A. J. Shields, P. Atkinson, K. Cooper, D. A. Richie, K. M. Groom, A. I. Tartakovskii, M. S. Skolnick
Inversion of exciton level splitting in quantum dots
Physical Review B
72 (11), Sept. 2005

H. Y. Liu, D. T. Childs, T. J. Badcock, K. M. Groom, I. R. Sellers, M. Hopkinson, R. A. Hogg, D. J. Robbins, D. J. Mowbray, M. S. Skolnick
High performance 3-layer InAs/GaAs quantum dot lasers with very low continuous wave room temperature threshold currents
IEEE Photonics Technology Letters
17 (6), p.1139-41, June 2005

H. Y. Liu, M. J. Steer, T. J. Badcock, D. J. Mowbray, M. S. Skolnick, P. Navaretti, K. M. Groom, M. Hopkinson, R. A. Hogg
Long wavelength light emission and lasing from InAs/GaAs quantum dots covered by a GaAs Sb strain reducing layer
Applied Physics Letters
86 (14), 143108, (2005)

S. K. Ray, K. M. Groom, H. Y. Liu, M. Gutiérrez, M. Hopkinson, R. A. Hogg, I. R. Sellers, T. Badcock, A. J. Ramsay, D. J. Mowbray, M. S. Skolnick
Growth, fabrication, and operating characteristics of ultra-low threshold 1.31μm quantum dot lasers
Japanese Journal of Applied Physics
44 (4B), p.2520-22, April 2005

A. I. Tartakovskii, M. N. Makhonin, I. R. Sellers, J. Cahill, A. D. Andreev, D. M. Whittaker, J. P. R. Wells, A. M. Fox, D. J. Mowbray, M. S. Skolnick, K. M. Groom, M. J. Steer, H. Y. Liu, M. Hopkinson
Effect of thermal annealing and strain engineering on the fine structure of quantum dot excitons
Physical Review B
70 (19), November 2004

I. R. Sellers, H. Y. Liu, K. M. Groom, D. T. Childs, D. Robbins, T. J. Badcock, M. Hopkinson, D. J. Mowbray, M. S. Skolnick
1.3μm InAs/GaAs multiplayer quantum-dot laser with extremely low room-temperature threshold current density
Electronics Letters
40 (22), p.1412-13, October 2004

A. I. Tartakovskii, M. N. Makhonin, J. Cahill, D. M. Whittaker, J. P. R. Wells, A. M. Fox, D. J. Mowbray, M. S. Skolnick, M. J. Steer, K. M. Groom, M. Hopkinson
Precise measurement of the fraction of charged dots in self-assembled quantum dot ensembles using ultrafast pump-probe techniques
Applied Physics Letters
85 (12), p.2226, September 2004

H. Y. Liu, I. R. Sellers, M. Gutiérrez, K. M. Groom, W. M. Soong, M. Hopkinson, J. P. R. David, R. Beanland, T. J. Badcock, D. J. Mowbray, M. S. Skolnick
Influences of the spacer layer growth temperature on multilayer InAs/GaAs quantum dot structures
Journal of Applied Physics
96 (4), p.1988-1992, August 2004

H. Y. Liu, I. R. Sellers, T. J. Badcock, D. J. Mowbray, M. S. Skolnick, K. M. Groom, M. Gutiérrez, M. Hopkinson, J. S. Ng, J. P. R. David, R. Beanland
Improved performance of 1.3μm multilayer InAs quantum dot lasers using a high growth temperature GaAs spacer layer
Applied Physics Letters
85 (5), p.704-706, August 2004

A. I. Tartakovskii, J. Cahill, M. N. Makhonin, D. M. Whittaker, J. P. R. Wells, A. M. Fox, D. J. Mowbray, M. S. Skolnick, K. M. Groom, M. J. Steer, M. Hopkinson
Dynamics of coherent and incoherent spin polarisations in ensembles of quantum dots
Physical Review Letters
93 (5), July 2004

A. I. Tartakovskii, K. M. Groom, A.M. Adawi, A. Lemaitre, A. M. Fox, D. J. Mowbray, M. S. Skolnick, M. Hopkinson
Dynamics of stimulated emission in InAs quantum dot laser structures measured in pumpprobe experiments
Applied Physics Letters
81 (22), p.4118-20, November 2002

K. M. Groom, A. I. Tartakovskii, D. J. Mowbray, M. S. Skolnick, P. M. Smowton, M. Hopkinson, G. Hill
Comparative study of InGaAs quantum dot lasers with different degrees of dot layer confinement
Applied Physics Letters
81 (1), p.1-3, July 2002

K. M. Groom, L. R. Wilson, D. J. Mowbray, M. S. Skolnick, G. Hill, M. J. Steer, M. Hopkinson
Electrically pumped InGaAs quantum dot ring and cylindrical cavity lasers
Electronics Letters
37 (20), p.1220-1222, September 2001

Refereed Conference Papers

R. R. Alexander, D. Childs, H. Agarwal, K. M. Groom, H.Y. Liu, M. Hopkinson, R.A. Hogg, M. Ishida, T. Yamamoto, M. Sugawara, Y. Arakawa, T. J. Badcock, D. J. Mowbray
Systematic study of the effects of d-p-doping on 1.3μm quantum dot lasers
2007 International conference on indium phosphide and related materials
proceedings, pp.517-520, 2007

T. L. Choi, S. K. Ray, Z. Zhang, D. Childs, K. M. Groom, B. J. Stevens, H. Liu, M. Hopkinson, R. A. Hogg
Quantum dot superluminescent diodes – bandwidth engineering and epitaxy for high powers
2007 International conference on indium phosphide and related materials
proceedings, pp.289-292, 2007

M. Blazek, S. Breuer, T. Gensty, W. E. Elsäßer, M. Hopkinson, K. M. Groom, M. Calligaro, P. Resneau, and M. Krakowski
Intensity noise of ultrabroadband quantum dot light emitting diodes and lasers at 1.3μm
Proceedings of SPIE
Volume 6603 Noise and Fluctuations in Photonics, Quantum Optics, and Communications, 66031Y, June 2007

A. G. Taboada, F. Suarez, D. Granados.
Electro-optical characterization of self-assembled InAs/GaAs quantum rings embedded in Pi-N and schottky diodes
Physics of Semiconductors
Pts A and B Volume: 893 Pages: 909-910 Published: July 2007

A. G. Taboada, F. Suarez, D. Granados, T. J. Badcock, D. J. Mowbray, K. M. Groom, B. Alen, J. M. Garcia, M. L. Dotor
Electro-optical characterization of self-assembled InAs/GaAs quantum rings embedded in P-i-N and schottky diodes
Physics of Semiconductors
Pts A & B 893: 909-910, 2007

I. P. Marko, A. R. Adams, S. Sweeney
Band gap dependence of the recombination processes in InAs/GaAs quantum dots studied using hydrostatic pressure
Physica Status Solidi B-Basic Solid State Physics
Volume: 244 Issue: 1 Pages: 82-86, (2007)

C. Y. Jin, H. Y. Liu, T. J. Badcock, K. M. Groom, M. Hopkinson, M. Gutierrez, D. T. Childs, C. Jin, R. A. Hogg, I. R. Sellers, D. J. Mowbray, M. S. Skolnick, R. Beanland, D. J. Robbins
High-performance 1.3-μm InAs/GaAs quantum-dot lasers with low threshold current and negative characteristic temperature
SPIE Semiconductor
Lasers & Laser Dynamics II 6184: 18417-18417, 2006

C. Y. Lin, H. Y. Liu, T. J. Badcock, K. M. Groom, M. Gutierrez, R. Royce, M. Hopkinson, D. J. Mowbray
High-performance 1.3 μm InAs/GaAs quantum-dot lasers with low threshold current and negative characteristic temperature
IEE Proceedings – Optoelectronics
153 (6), p. 280-3, Dec 2006

I. P. Marko, A. R. Adams, S. J. Sweeney, N. F. Masse, R. Krebs, J. P. Reithmaier, A. Forchel, D. J. Mowbray, M. S. Skolnick, H. Y. Liu, K. M. Groom, N. Hatori, M. Sugawara
Band gap dependence of the recombination processes in InAs/GaAs quantum dots studied using hydrostatic pressure
Physica Status Solidi B
2441 (1), pp.82-86, Jan 2007

R. J. Young, R. M. Stevenson, A. J. Shields, P. Atkinson, K. Cooper, D. A. Richie, K. M. Groom, A. I. Tartakovskii, M. S. Skolnick
Inversion of the exciton fine structure splitting in quantum dots
Physica E – Low Dimensional Systems and Nanostructures
32 (1-2), p.97-100, May 2006

S. K. Ray, K. M. Groom, M. Beattie, H. Y. Liu, M. Hopkinson, R. A. Hogg
Broad-band superluminescent light emitting diodes incorporating quantum dots in compositionally modulated quantum wells
Proc. SPIE 6129 – Quantum Dots, Particles and Nanoclusters
III, pp.52-57, 2006

H. Y. Liu, T. Badcock, K. M. Groom, M. Hopkinson, M. Gutierrez, D. T. Childs, C. Y. Jin, R. A. Hogg, I. R. Sellers, D. J. Mowbray, M. S. Skolnick, R. Beanland, D. J. Robbins
High performance 1.3μm InAs/GaAs quantum dot lasrs with low threshold current and negative characteristic temperature
Proc SPIE 6184 – Semiconductor Lasers and Laser Dynamics
II, pp.374- 384, 2006

H. Y. Liu, I. R. Sellers, M. Gutierrez, K. M. Groom, R. Beanland, W. M. Soong, M. Hopkinson, J. P. R. David, T. Badcock, D. J. Mowbray, M. S. Skolnick
Optimising the growth of 1.3μm InAs/InGaAs dots in a well structure: Acheivement of high performance laser
Materials Science and Engineering C – Bioetric and supramolecular systems
25 (5-8), p.779-83, Dec 2005

I. P. Marko, N. Masse, S. J. Sweeney, A. R, Adams, I. R. Sellers, D. J. Mowbray, M. S. Skolnick, H. Y. Liu, K. M. Groom
Effect of gain saturation and nonradiative recombination on the thermal characteristics of InAs/GaAs 1.3μm quantum dot lasers
IEEE LEOS Annual Meeting
Conference Proc. P.401-407, 2005

I. R. Sellers, H. Y. Liu, D. J. Mowbray, T. Badcock, K. M. Groom, M. Hopkinson, M. Gutierrez, M. S. Skolnick, R. Beanland, D. T. Childs, D. J. Robbins
Growth and characterisation of 1.3μm multilayer quantum dot lasers incorporating high growth temperature spacer layers
Physics of Semiconductors Parts A and B
772, p.1547, 2005

H. Y. Liu, T. Badcock, I. R. Sellers, W. M. Soong, K. M. Groom, M. Hopkinson, D. J. Mowbray, M. S. Skolnick
Enhanced PL intensity of 1.3μm multilayer InAs/InGaAs dots-in-well structure using the high growth temperature spacer layer step
Physics E, Low Dimensional Systems and Nanostructures
26 (1-4), p. 129-32, Feb 2005

I. P. Marko, A. R. Adams, S. J. Sweeney, I. R. Sellers, D. J. Mowbray, M. S. Skolnick, H. Y. Liu, K. M. Groom
Recombination and loss mechanisms in low-threshold InAs/GaAs 1.3um quantum dot lasers
2004 IEEE 19th International Semiconductor Laser Conference
Conference Digest, p.57, 2004

I. R. Sellers, H. Y. Liu, T. J. Badcock, K. M. Groom, D. J. Mowbray, M. Gutierez, M. Hopkinson, M. S. Skolnick
Lasing and spontaneous emission characteristics of 1.3μm In(Ga)As quantum dot lasers
Physica E
26 (1-4), p.382-5, 2005

K. M. Groom, R. A. Hogg, H. Y. Liu, S. K. Ray, I. R. Sellers, T. Badcock, D. J. Mowbray, M. S. Skolnick, M. Hopkinson, J. P. R. David
Characteristics of Ultra-Low Threshold 1.3μm Quantum Dot Lasers
TMS Letters
1, p.129, 2004

K. M. Groom, H. Y. Liu, I. R. Sellers, S. K. Ray, T. Badcock, M. Gutiérrez, M. Hopkinson, J. S. Ng, R. A. Hogg, J. P. R. David, D. J. Mowbray, M. S. Skolnick
Characteristics of low threshold quantum dot lasers operating at 1.31μm
Proceedings, 30th European Conference on Optical Communications
Stockholm, 2004

A. I. Tartakovskii, K. M. Groom, A. M. Adawi, A. Lemaitre, D. J. Mowbray, M. S. Skolnick, M. Hopkinson
Dynamics of stimulated emission in InAs quantum dot laser structures measured in pumpprobe experiments
Ultrafast phenomena in semiconductors and nanostructure materials VIII. Proc. Society of photo-optical instrumentation engineers
5352, p.348-354, 2004

E. Herrmann, P. M. Smowton, Y. Ning, K. M. Groom, D. J. Mowbray, M. Hopkinson
Performance of lasers containing 3, 5, and 7 layers of quantum dots
IEEE Proceedings – Optoelectronics
148 (5-6), p.238-242, October 2001

K. M. Groom, A. D. Ashmore, D. J. Mowbray, M. S. Skolnick, M. Hopkinson, G. Hill, J. Clark, P. M. Smowton
Optical spectroscopic study of carrier processes in self-assembled In(Ga)As-Ga(Al)As quantum dot lasers
Physica Status Solidi (b)
224 (1), p.123-127, 2001