Femtosecond Pump–Probe Microscopy PhD | Modular Imaging of Carrier Dynamics

Femtosecond Pump–Probe Microscopy PhD | Modular Imaging of Carrier Dynamics

Quick Decision

Promising with material uncertainties. This is a hands-on experimental physics doctorate built around extending and validating a modular femtosecond pump–probe microscope, then using it to study carrier relaxation, nonlinear absorption and exciton recombination in 2D semiconductors and nanoplasmonic composites. It is most relevant to applicants trained in physics, electrical engineering or photonics who want to combine optical instrumentation, software and solid-state materials research.

The strongest features are the unusually concrete instrument-development tasks and the close fit with Dr Andre Kaplan’s ultrafast carrier-dynamics research and the wider Metamaterials and Nanophotonics group. The main decision risks are funding and technical readiness: the broad “competition-funded for students worldwide” label conflicts with the detailed nationality-specific terms; no 2027 award, stipend or fee coverage is confirmed; and the publicly linked application portal currently shows 2025/26 routes only. The project brief also advertises a time resolution of a few tens of femtoseconds, while a separate group equipment inventory lists one laser configuration at 200 fs. That does not prove a contradiction, but the actual instrument and measurement response need clarification.

Before preparing a full application, ask the supervisor whether the October 2027 place is still open, which application route to use, and what funding applies to the applicant’s fee status. At interview, ask for the current microscope configuration, pulse width and measured instrument response at the sample, committed equipment access, and the initial materials and benchmarks. The supplied project description sets out the work and says applications remain open until the place is filled. The linked application portal currently displays 2025/26 options only, so the 2027 application route and project code need confirmation.

Research Problem and Doctoral Work

What Is Unsolved and Why It Matters

Pump–probe microscopy uses a short pump pulse to excite a material and a delayed probe pulse to measure how its optical response changes over time. Scanning the delay can resolve transient processes; moving the probe across a sample can map where they occur. The advertised problem is both scientific and instrumental: obtain useful time-resolved, micron-scale maps of charge-carrier dynamics while making a microscope flexible enough to support several measurement channels and material systems.

The project brief says the microscope’s core framework is already in place. The doctorate would adapt it rather than start from a blank page. The stated target is a time resolution of a few tens of femtoseconds and spatial resolution at the micron scale. Those are project claims to verify against an instrument-response measurement. Laser pulse duration, pump–probe cross-correlation, instrument response at the sample and the time resolution reported for a measured signal are related but distinct quantities.

Work, Methods, and Potential Outputs

The described work includes:

• Extending the modular setup for reflectance, transmission and photoluminescence (PL), then adding polarization-resolved and nonlinear measurements.
• Implementing delay-line scanning and integrating tunable pump and probe sources.
• Writing measurement-control and acquisition software in MATLAB or Python. FPGA work is described as optional.
• Benchmarking the system before applying it to new materials.
• Mapping carrier relaxation, nonlinear absorption and exciton recombination in 2D semiconductors and nanoplasmonic composites.

This creates a substantial instrumentation PhD as well as a materials-physics project. A sensible research path would be to establish calibration, stability, spatial response and time-response benchmarks before interpreting material dynamics. That is an analytical suggestion, not a confirmed work-package schedule. The brief does not name the first sample, sample supplier, target wavelength range, baseline comparison or success threshold.

Recent original studies illustrate why both instrumental performance and material choice matter. A 2025 wide-field method uses self-referencing to reduce laser-noise limitations in pump–probe imaging and applies the approach to WSe2-based structures; it is a different apparatus, not a performance guarantee for this project. A 2023 study examines coherent phonon–exciton coupling in monolayer MoTe2, while a 2022 pump–probe microscopy paper maps carrier transport in transition-metal dichalcogenides. These papers show relevant research questions, but their results should not be assumed to transfer to the Birmingham instrument or selected samples.

School, Programme and Field Context

The degree-awarding institution is the University of Birmingham, and the project brief places the work in its School of Physics and Astronomy and Metamaterials and Nanophotonics group. The university course page gives an in-person format and a typical full-time PhD duration of 3.5 years; the project’s actual award and registration period are not stated. The general programme entry threshold is a 2:1 Honours degree. The course page also states that international students need an ATAS certificate before the university can issue a CAS.

For discipline-level context, the course page reports Physics at 5th in the UK in the Complete University Guide 2027, Birmingham at 68th overall in the QS World University Rankings 2027, and the School’s Physics research at the top in the UK for 4-star-category research in REF 2021. The School’s postgraduate research page describes regular seminars, collaborative research groups and a wider Doctoral Programme with researcher-development support. These are relevant institutional and subject signals; they do not assess this project’s equipment readiness or guarantee an individual outcome. See the Physics and Astronomy PhD programme, its international fee view, the School’s postgraduate research environment, and School overview.

Supervisor and Lab Assessment

Supervisor Research Directions

Dr Andre Kaplan is an Associate Professor in Physics and Astronomy, a member of the Metamaterials and Nanophotonics Group, and is listed as accepting PhD students. His institutional profile describes ultrashort-pulse research on excitation relaxation and charge-carrier/lattice dynamics at surfaces and nanoscale systems, which is a strong topical match for the project. The supervisor profile establishes subject alignment, but it does not state the supervision schedule, capacity for this specific intake or co-supervisor arrangements.

Recent Important Publications

• In Active control of mid-wavelength infrared non-linearity in silicon photonic crystal slab, Kaplan and colleagues use a customized time-resolved Z-scan with pump–probe provisions to study nonlinear response in a silicon photonic crystal. This is direct evidence of local experience in ultrafast nonlinear optical measurements, although it is not the advertised spatially resolved microscope.
• Taming non-radiative recombination in Si nanocrystals interlinked in a porous network links recombination pathways in porous silicon nanocrystals to surface passivation and confinement. It is relevant to carrier-relaxation questions, but the studied material differs from 2D semiconductors.
• The group-affiliated All-optical subcycle microscopy on atomic length scales reports femtosecond microscopy at atomic spatial scales using near-field and nonlinear interactions. It shows advanced local microscopy expertise, but the optical geometry and resolution regime are distinct from the proposed micron-scale pump–probe instrument.
• Electrochemically Switchable Multimode Strong Coupling in Plasmonic Nanocavities provides recent group context on plasmonic materials and their optical response. It is not a pump–probe carrier-dynamics study.

Together, these works show credible overlap in ultrafast optics, carrier dynamics and nanophotonic materials. They do not establish which experiments, materials or collaborators will be assigned to this student.

Lab, Resources, and Collaboration Environment

The Metamaterials and Nanophotonics group is interdisciplinary, with activity across physics, engineering and chemistry. Its group roster provides a view of the wider team. A public equipment inventory lists ultrafast lasers, spectroscopy and microscopy equipment, cryogenic facilities and micro/nanofabrication tools. The group’s ultrafast microscopy page describes specialist near-field and terahertz microscopy.

The equipment inventory lists a Mai Tai ultrafast Ti:Sapphire laser with an OPO configuration at 200 fs. That entry is not identified as the project’s instrument. Ask whether the project uses a different source, what pulse duration reaches the sample, how the time response is measured, and which components are already operating. Public descriptions demonstrate a relevant group environment, but do not confirm dedicated access, technician support, uptime, sample provision or a complete instrument build.

Funding, Application, and Living Cost

Funding and Fees

The supplied project information has a material internal mismatch. One category label describes a competition-funded PhD open to students worldwide, but the detailed terms state that UK applicants may compete for a School-funded studentship or self-fund; applicants from China may self-fund or apply through CSC after receiving an offer; and EU and other international applicants must self-fund. It does not specify a 2027 award amount, stipend, number of places, fee coverage, bench-fee coverage or award length.

The official course page lists annual 2027 tuition of £5,400 for UK/Ireland students and £30,780 for international students. These are course fees, not evidence that the project will cover them. Fees are annual and may change in later years. The university notes that intensive laboratory research may incur a bench fee, which should be disclosed with an offer. Its postgraduate research fee guidance also describes annual fee changes and possible continuation fees after the minimum registration period.

The University–CSC page is for Autumn 2026 entry and is marked closed. Its 2026 arrangement covered overseas tuition and associated bench fees through Birmingham, with a maintenance stipend and return airfare from CSC. This is useful historical context, not evidence of a 2027 call or this project’s eligibility. Applicants from China should confirm a future scheme and its nomination timeline directly. See the 2026 CSC scholarship page.

Application Route and Documents

The project brief states an October 2027 start and applications until the position is filled. University guidance says advertised-project applicants should follow the project-specific deadline and route. The supplied application portal currently shows only 2025/26 Physics PhD and MSc(R) entries, so the 2027 route is not independently confirmed.

The project brief requests a CV, academic transcripts and a one-page research-interest statement, and asks applicants to name Dr Andre Kaplan as supervisor. General university advertised PhD guidance describes academic certificates, references and English evidence, with a personal statement of approximately 5,000 characters. Ask whether the one-page statement is additional to or replaces that general statement, which references are needed at submission, and what English evidence and fee-status documents apply. The general research application guidance recommends checking project-specific terms before applying.

Living Cost and Buying Power

The University’s indicative 50-week guide estimates essential costs of £9,250 per year for self-catered halls or £8,700 for a private house, plus £5,500 per year in variable costs. It lists a £550 initial halls prepayment. The separate 2026/27 postgraduate accommodation list spans £107–£360 per week, depending on room type, and says contracts generally run 42, 50 or 51 weeks. The postgraduate money guide is for planning, not a personal or 2027 budget. Living costs are additional to tuition; any stipend or work income is not confirmed for this project.

Applicant Fit and Preparation

Required Background and Skills

The project description names a degree in physics, electrical engineering or photonics and interest in lasers and instrumentation. The general programme page states a 2:1 Honours requirement. These are the supported academic criteria; a project-specific equivalency or master's requirement is not stated. The course page says international students need ATAS before a CAS is issued. Check the current English-language requirement for the intended offer rather than assuming the same rule for every applicant.

Preferred Experience and Suggested Preparation

Optical alignment and programming are described as helpful, while full training is promised. These are not stated as mandatory experience. Useful preparation would include examples of experimental or engineering work, MATLAB or Python coding, spectroscopy, signal analysis, optomechanics or solid-state physics. Applicants should explain their own role in any relevant project and how they calibrated or validated results.

The listed skill mix can transfer to photonics and semiconductor research, optical instrumentation, laser systems, materials characterization, research software and academic work. The UK Photonics Leadership Group estimates 2024 output of £18.5bn, 84,800 employees and over 1,400 firms. A 2025 government workforce study estimates about 27,245 people in the UK semiconductor workforce, with 69% in technical roles. The 2026 government semiconductor sector study identifies photonics as a near-term opportunity while noting skills and talent-retention barriers. These are broad market indicators, not vacancy counts, graduate placement rates or a promise of employment. The UK Photonics 2025 report and the government's 2025 semiconductor workforce summary describe sector-level context.

Next Actions and Questions to Verify

Before Applying

1. Ask Dr Kaplan whether the October 2027 position is still open and which current portal route/project code to use.
2. Obtain written confirmation of the applicant’s fee category, whether this exact project has a School studentship, and any award coverage for tuition, stipend, bench fees, research expenses and duration.
3. Ask Chinese applicants whether a 2027 CSC round and University nomination pathway have been confirmed; the reviewed official CSC page covers a closed 2026 intake.
4. Reconcile the requested one-page research-interest statement with the generic personal statement and reference requirements.

At Interview

1. Ask which microscope parts are already assembled and working, which are part of the PhD build, and what detector, delay-line, laser and technical support will be available.
2. Ask for the pulse duration at the sample and measured instrument-response function, and how both relate to the advertised few-tens-of-femtoseconds resolution.
3. Ask which 2D semiconductor and nanoplasmonic samples are planned, who supplies them, and what first benchmarks will demonstrate useful operation.
4. Confirm the formal supervisor team, supervision cadence and scheduling/access arrangements for shared laser, microscopy and cleanroom facilities.

Before Accepting an Offer

Get the full written terms: registration and funded duration, fee coverage by year and fee status, stipend and indexation, possible bench fees, research/travel budget, and project start date. Compare them with the anticipated housing and living budget; do not infer funding from the broad project category label.

Evidence and Sources

University, Programme and Application

• Physics and Astronomy PhD / MSc (Res)
• International tuition view for Physics and Astronomy
• Physics and Astronomy postgraduate research environment
• About Physics and Astronomy
• How to apply to research courses
• Apply for an advertised PhD
• Physics and Astronomy application portal
• Fees for postgraduate researchers

Supervisor, Group and Facilities

• Andre Kaplan profile
• Metamaterials and Nanophotonics Group
• Metamaterials and Nanophotonics group members
• Key group equipment
• Ultrafast Microscopy

Papers and Research Frontier

• Active control of mid-wavelength infrared non-linearity in silicon photonic crystal slab
• Taming non-radiative recombination in Si nanocrystals interlinked in a porous network
• Localized Plasmon Field Effect of Gold Clusters Embedded in Nanoporous Silicon
• All-optical subcycle microscopy on atomic length scales
• Electrochemically Switchable Multimode Strong Coupling in Plasmonic Nanocavities
• Self-referencing ultrafast wide-field pump-probe microscopy
• Strong Coupling of Coherent Phonons to Excitons in Semiconducting Monolayer MoTe2
• Transient Superdiffusion of Energetic Carriers in Transition Metal Dichalcogenides Visualized by Ultrafast Pump-Probe Microscopy

Funding, Cost and Career Context

• China Scholarship Council–University of Birmingham PhD Scholarships (Autumn 2026)
• Postgraduate money advice
• 2026/27 postgraduate accommodation fees
• UK Photonics 2025: The Hidden Economic Engine
• UK Semiconductor Workforce Study: Executive Summary
• Semiconductor sector study 2026