George Jandu
MPhys
Teams and roles for George Jandu
Research student
PhD Student
Overview
My research is centred around achieving record high temperature (> 250 degrees celsius) lasing in semiconductor diodes. This goal is of commercial interest for several applications as it would remove the requirement for bulky cooling systems which increase both device footprint and power consumption.
Publication
2026
- Jandu, G. and Smowton, P. 2026. Computationally efficient simulation of multimode interference reflectors in the frequency domain. Presented at: The 26th European Conference on Integrated Optics Cardiff, UK 10-12 June 2025. Springer Nature.
2025
- Jandu, G. M. and Smowton, P. M. 2025. Graphics processor unit accelerated design of multimode interference reflectors. Presented at: International Conference on Numerical Simulation of Optoelectronic Devices, (NUSOD) Lodz, Poland 14-18 September 2025. International Conference on Numerical Simulation of Optoelectronic Devices, (NUSOD). IEEE. , pp.15-16. (10.1109/nusod64393.2025.11199575)
- Jandu, G. M. et al. 2025. Optical gain in O-band active regions with multiple dot-in-well layers. APL Photonics 10 (10) 106112. (10.1063/5.0275039)
- Mishra, P. et al. 2025. Achieving selectivity and reduced absorption for low loss monolithic InAs QD based III-V photonic integration. Journal of Physics D: Applied Physics 58 (26) 265104. (10.1088/1361-6463/ade450)
- Mishra, P. et al. 2025. High temperature operation of co-doped InAs quantum dot laser for O-band emission. IEEE Photonics Journal 17 (3) 0600606. (10.1109/jphot.2025.3560443)
- Park, J. et al., 2025. High operating temperature (> 200 °C) InAs/GaAs quantum-dot laser with co-doping technique. Journal of Physics D: Applied Physics 58 (18) 185101. (10.1088/1361-6463/adc275)
Articles
- Jandu, G. M. et al. 2025. Optical gain in O-band active regions with multiple dot-in-well layers. APL Photonics 10 (10) 106112. (10.1063/5.0275039)
- Mishra, P. et al. 2025. Achieving selectivity and reduced absorption for low loss monolithic InAs QD based III-V photonic integration. Journal of Physics D: Applied Physics 58 (26) 265104. (10.1088/1361-6463/ade450)
- Mishra, P. et al. 2025. High temperature operation of co-doped InAs quantum dot laser for O-band emission. IEEE Photonics Journal 17 (3) 0600606. (10.1109/jphot.2025.3560443)
- Park, J. et al., 2025. High operating temperature (> 200 °C) InAs/GaAs quantum-dot laser with co-doping technique. Journal of Physics D: Applied Physics 58 (18) 185101. (10.1088/1361-6463/adc275)
Conferences
- Jandu, G. and Smowton, P. 2026. Computationally efficient simulation of multimode interference reflectors in the frequency domain. Presented at: The 26th European Conference on Integrated Optics Cardiff, UK 10-12 June 2025. Springer Nature.
- Jandu, G. M. and Smowton, P. M. 2025. Graphics processor unit accelerated design of multimode interference reflectors. Presented at: International Conference on Numerical Simulation of Optoelectronic Devices, (NUSOD) Lodz, Poland 14-18 September 2025. International Conference on Numerical Simulation of Optoelectronic Devices, (NUSOD). IEEE. , pp.15-16. (10.1109/nusod64393.2025.11199575)
Research
I am working on high operating temperature semiconductor lasers; currently I am focused on assessing the potential of quantum dot-in-well (DWELL) lasers with non-trivial reflector geometries to advance the upper limit on devices grown on GaAs substrates.
Lasers capable of uncooled operation have smaller device footprints and consume less power (owing to the removal of any cooling infrastructure) making them attractive for applications such as short range data communication and heat assisted magnetic recording.
Much of my work focuses on modelling the propagation and scattering of electromagnetic waves in compound semiconductors. To this end I have produced code to implement methods like the finite difference frequency domain (FDFD), finite difference time domain (FDTD) and eigenmode expansion (EME) techniques.
This project is funded by the EPSRC centre for doctoral training in compound semiconductor manufacturing with Seagate as an industry partner.
Teaching
In my first year I was a demonstrator in the second year undergraduate lab, where I oversaw experiments investigating the magnetic fields produced by a pair of Helmholtz coils and how they can be used for resonance spectroscopy.
Currently I am a demonstrator in the third year computational physics module, which has an emphasis on numerical techniques including various formulations of the finite difference method for solving differential equations.
Contact Details
Research themes
Specialisms
- Photonics, optoelectronics and optical communications
- Compound semiconductors
- Quantum Dots