The Role
Designs and simulates VCSELs for microLED and optical interconnect applications. Builds optical, electrical, and thermal models; runs FDTD simulations; analyzes modulation response and device performance; conducts parametric studies to guide epitaxial design, apertures, mirrors, and layouts; and validates models against experimental LIV, spectral, and high-speed data.
Summary Generated by Built In
Join our photonics team and work at the forefront of microLED and optical interconnect technology. As our Senior Photonics Simulation Engineer you will own the design and simulation of vertical-cavity surface-emitting lasers for next-generation optical links, using FDTD as the primary tool.
You will model VCSEL optical, electrical and thermal behaviour, from epitaxial structure to packaged device. Your results will directly shape epi design, device layout and process choices. You will also help drive new research into high-speed, energy-efficient light sources that push what optical interconnect can do.
Key Responsibilities
- Build VCSEL models covering DBR mirrors, active region, oxide aperture and optical cavity.
- Run FDTD simulations of optical modes, cavity resonance, wavelength, far-field and beam profile.
- Model current spreading, self-heating and thermal rollover, using COMSOL or equivalent tools.
- Simulate high-speed modulation and small-signal response for optical interconnect links.
- Run parametric studies to guide epi design, aperture size, mirror design and device layout.
- Validate models against measured LIV, spectral and high-speed data and turn results into clear design rules.
Skills, Knowledge and Expertise
- Degree in Physics or Electronic Engineering. A PhD or MSc is an advantage.
- Proven hands-on VCSEL or semiconductor laser design and simulation.
- Proven FDTD simulation experience, for example Ansys Lumerical FDTD or similar. Wider tools such as Crosslight PICS3D, RSoft or COMSOL are a plus
- Strong grounding in semiconductor laser physics, including optical cavities, gain and carrier dynamics. You understand the theory behind the simulations, not just the tools.
- Track record of validating models against experimental data.
- Clear communication of technical results.
Benefits
- Pension scheme
- Private medical & dental insurance
- 28 days’ holiday + bank holidays
- Free onsite meals
- Onsite gym
- Relocation support
- Visa support available
About
About PlesseyWe’re building the hardware foundation for next-era computing.Plessey is a world-leading technology company driving the next generation of photonic devices and systems. With over 70 years of innovation, we combine research, materials science, process engineering, and manufacturing under one roof. We’re recognised as a global authority in microLED displays and optical interconnects.Join us to work on breakthrough technologies shaping the future of light-based technology and computing.LeadWe don’t follow industry trends; we create them, pushing boundaries and setting standards others aspire to. Every team member has the power to make decisions, drive change, and deliver excellence. We support each other, challenge one another for the best solutions, and lead by example. Together, we build industries and technologies that shape the future and scale toward our vision of the next era of computing.GrowWe expand our capabilities every day — deepening our expertise, improving how we work, and pushing the boundaries of what’s possible. Curiosity fuels us: we question assumptions, explore new ideas, and innovate with light-based technologies. By investing in and empowering our people, we strengthen Plessey’s impact and help shape the future of optical technology.TrustWe operate like a family—honest, reliable, and supportive. We have each other’s backs, own our actions, and uphold the highest standards of integrity and safety. We trust each other to deliver, our customers to challenge us, and our expertise to guide the way. Together, trust enables the collaboration essential for breakthrough innovation and lasting impact.
Skills Required
- Degree in Physics or Electronic Engineering
- Hands-on experience with VCSEL or semiconductor laser design and simulation
- FDTD simulation experience using Ansys Lumerical FDTD or a similar tool
- Strong understanding of semiconductor laser physics, optical cavities, gain, and carrier dynamics
- Experience validating simulation models against experimental data
- Clear communication of technical results
- PhD or MSc
- Experience with Crosslight PICS3D, RSoft, or COMSOL
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The Company
What We Do
Plessey is a UK-based technology company specializing in the design and manufacturing of advanced microLED display solutions. They utilize a proprietary GaN-on-Silicon platform to produce high-performance, high-density RGB pixel arrays for applications in Augmented Reality (AR), Virtual Reality (VR), and other head-mounted display systems. The company operates integrated manufacturing facilities in Plymouth, England, focusing on the next generation of photonic technologies for computing and display engines.
