PhD: Photonic Technologies for Radiative Cooling and Energy Harvesting

PhD: Photonic Technologies for Radiative Cooling and Energy Harvesting

Research cut-off: 6 November 2026

Quick Decision

Promising with material uncertainties. This is a four-year UCL Electronic and Electrical Engineering project built around photonics, thermal radiation, materials, and energy technology. It has a relevant supervisor and lab, recent team publications, and a strong advertised funding package. The central application condition is that the official UELA 2027–28 catalogue marks this as a standard project open only to Home-fee candidates. A general fee-gap statement in the supplied project synopsis should not be treated as an exception to that project-specific restriction. The other key uncertainty is scope: the listing offers several possible research directions but does not identify one fixed thesis question or detailed milestones. The official project catalogue and UELA guidance should be checked before preparing an application.

For a candidate who meets the Home-fee condition and wants interdisciplinary photonics and thermal-energy research, the main next step is to ask the supervisor which technical strand, first-year work package, and facility access are planned for this studentship.

Research Problem and Doctoral Work

What Is Unsolved and Why It Matters

Earth continuously radiates heat back through the atmosphere and into space. The project frames control of that outgoing thermal radiation as less developed than technologies for harvesting incoming sunlight. Its motivating goal is to use photonic design to make thermal radiation more controllable and potentially useful in energy systems. This sits within a broader cooling challenge: the International Energy Agency's 2023 guide says space-cooling energy use would more than double by 2050 without action. That scenario supports the importance of improved cooling approaches; it does not mean radiative cooling alone can replace efficient equipment, passive design, or other energy measures. IEA's 2023 space-cooling guide and its earlier Future of Cooling report provide broader demand context.

Work, Methods, and Potential Outputs

The official listing describes four possible areas: spectrally and directionally selective heat emitters; metasurfaces that split, collimate, or focus thermal radiation; mid-infrared receivers intended to convert radiative heat flows into useful energy; and non-reciprocal photonic systems aimed at approaching thermodynamic limits. Advertised work spans theoretical modelling, nanophotonic design, materials development, fabrication, and experimental characterisation. The long-term goal is scalable technology that can complement and integrate with solar-energy infrastructure. The project entry does not say that every listed direction will be included in one thesis. Ask which one or two questions will anchor the PhD, what comparison or benchmark will define progress, and how the topic will be narrowed to fit the four-year funded period.

Recent field reviews describe applications across buildings, energy generation, personal thermal management, and other settings, while also assessing how far demonstrations have progressed toward practical use. That makes robustness, environmental variability, manufacturability, and system integration sensible questions to raise, but these are possible research angles rather than promised work packages. See the 2024 reviews on radiative-cooling design and applications and moving beyond materials toward real-world applications.

School, Programme and Field Context

The host is UCL Engineering Sciences, Electronic and Electrical Engineering; UCL is the degree-awarding institution. UCL's EEE MPhil/PhD normally focuses on one principal research topic and usually takes three to four years. PhD students initially register for an MPhil and transfer to the PhD after a year, subject to a transfer examination; the final PhD examination includes a thesis and oral examination. The UELA award for this listing is advertised for four years, with thesis submission expected within the funded period. The department's research-degree page describes the route; the UCL graduate-course page provides course-specific information.

As broad research-strength signals, UCL reports that EEE ranked second in the UK in the Times Good University Guide 2026. UCL also reports second place in UK research power in REF 2021, while the Faculty of Engineering reports fifth place in UK engineering research power. The subject ranking is reported by UCL's course page; the REF figures are older, institution- or faculty-wide results. None is a score for this particular lab or project. UCL's institutional REF summary and Engineering REF page show the scope of those claims.

Career context

Employment evidence supports only a broad context. UCL's EEE graduate-course page describes doctoral graduates entering academia and industry, including government, technology and semiconductor organisations. The UK Clean Energy Jobs Plan signals projected growth across the wider clean-energy workforce, while describing its workforce estimates as indicative. Given this project's training, photonics and optical engineering, materials and functional-surface development, and thermal-management or energy-technology R&D are plausible transferable paths; that mapping is an inference. These sources do not establish demand for radiative-cooling specialists, a project-specific placement or employer network, or any employment outcome for this PhD. UCL's graduate-course page and the UK Clean Energy Jobs Plan provide the broad context.

Supervisor and Lab Assessment

Supervisor Research Directions

Professor Ioannis Papakonstantinou is a UCL Professor of Photonics and Nanofabrication and founded the Photonics Innovations Lab in 2011. The lab describes work on nanoscale light–matter interactions, nanostructures, multifunctional surfaces, solar-energy applications, and thermochromic materials. Its stated research chain runs from modelling and design through fabrication and experimental characterisation, with interdisciplinary work and industrial engagement. The team page also identifies current researchers working on computational light-scattering models and thermal-management devices. These descriptions align with the advertised methods but are lab-wide capabilities, not a guarantee of a particular instrument or allocation to this student. The lab overview and team page give the group context; the UCL profile is the institutional profile linked from the project catalogue.

UCL reported in May 2024 that the PI received an ERC Advanced Grant for passive daytime radiative cooling. The announcement describes potential settings including buildings, transport, data centres, food cold chains, and industrial processes. This is evidence of adjacent research momentum, not evidence that the UELA studentship is charged to that grant or receives its equipment. UCL's grant announcement does not specify project-level resource allocation.

Recent Important Publications

• Li et al. (2025), “All-day radiative cooling with superhydrophobic, fluorine-free polydimethylsiloxane-embedded porous polyethylene coating.” The team reports a 36-hour outdoor test in London, with the tested surface below ambient temperature during both direct sunlight and night-time conditions, and estimates for ten European cities. This shows recent experience extending materials work to environmental testing. The result is one coating demonstration, not proof of broad commercial readiness or a promised result for this PhD. Full paper in UCL Discovery.

• Ramirez-Cuevas et al. (2024), “Infrared thermochromic antenna composite for self-adaptive thermoregulation.” This peer-reviewed Nature Communications study reports a temperature-responsive infrared composite and discusses potential adaptive thermal-management applications. It connects the group's materials and photonics work to control of thermal emission, while remaining a laboratory study rather than a deployed cooling system. Open-access article.

• Pattelli and Papakonstantinou (2024), “Passive daytime radiative cooling.” This short overview provides context for passive daytime cooling and the group’s research direction; it is a review, not original experimental work. Article record.

The PI and collaborators also listed a September 2026 selective-emitter study for urban heat islands as a preprint. It is topical to the project but was not peer reviewed at the research cut-off, so treat its claims as preliminary. Preprint record, corroborated by the PI's ORCID works record and the SINCERE project publication list. A November 2026 editorial interview profiles the PI's wider photonics portfolio; it is useful context rather than a research paper. Light: Science & Applications profile.

Lab, Resources, and Collaboration Environment

The lab says it spans modelling, nanofabrication, and experimental characterisation, and reports industrial collaborations. EEE also describes access to broad research infrastructure, including the London Centre for Nanotechnology and in-house design and test facilities. These pages provide a plausible training environment for the advertised work. Public information does not specify which facilities, mid-infrared measurement equipment, collaborators, or supervisor time are committed to this studentship. Ask for concrete examples of student access and training rather than assuming all lab capabilities are available to every project. EEE's course page gives department-wide infrastructure information.

Funding, Application, and Living Cost

UELA 2027–28 offers four years of fees at the Home rate and a Research Training Support Grant for eligible additional training and research costs. The £26,022 figure is an estimated annual stipend for 2026/27, £1,500 above the UKRI London-weighted rate of £24,522; it is not a four-year total. The exact 2027–28 Home fee amount, stipend schedule, and RTSG allocation are not confirmed in the available sources. The published deadline is 8 January 2027 at noon UK time. Two references must be submitted by the deadline; UCL recommends submitting the application and references by 16 December 2026 because there will be no email support during the Christmas closure. Academic merit is the stated primary selection criterion. Initial shortlisting is expected to finish in late January and is anonymised; interviews are expected in February, and final offers around mid-March 2027. An informal studentship offer is followed by a separate formal UCL admissions application. The UELA page gives the funding and selection terms; the applicant guide provides the written-response prompts.

Eligibility needs explicit confirmation. The official project catalogue marks this as a standard project and says only Home-fee candidates can apply. The general UELA page describes fee-gap support for international candidates on eligible projects, but that does not override this project's listed restriction. Applicants unsure of their Home-fee status should get it assessed by UCL before preparing an application. The catalogue also allows applicants to choose up to three projects and says late references make an application ineligible. The project catalogue is the project-specific source. UCL's general research-fee schedule also notes that a minority of PhD students may face an additional fee element; no public source confirms whether one applies here.

For London budgeting, UCL lists postgraduate hall rent between £153 and £529 per week, and essential non-housing spending at about £426 per month. The stipend annualised over twelve months is about £2,169 per month. Adding the UCL rent and essential-cost estimates gives a rough range of about £1,089–£2,718 per month before discretionary expenses. This is a simple comparison of indicative figures, not an individual budget; the higher housing range leaves much less room for discretionary costs. UCL notes that estimates can change, and international visa or healthcare setup costs may apply only where relevant. UCL's current cost guide provides the rent and essential-spending ranges. The Home fee rate for 2027–28, exact RTSG amount, stipend payment schedule, and any project-specific additional fee remain unconfirmed.

Applicant Fit and Preparation

Required Background and Skills

The project listing welcomes physics, optics, materials science, chemistry, mathematics, electronic engineering, and mechanical engineering backgrounds, and says previous radiative-cooling experience is not required. UCL's general research-degree baseline normally requires a first or upper-second-class appropriate UK bachelor's degree or a recognised taught master's, with an overseas equivalent accepted; requirements vary by department. English-language evidence may also be required depending on the applicant and programme. Exact EEE requirements should be confirmed during the formal course application. UCL's entry requirements and EEE course page explain the general rules.

Preferred Experience and Suggested Preparation

The listing does not require prior experience in radiative cooling. As preparation rather than a formal eligibility rule, applicants could show relevant analytical physics or engineering, optics, numerical or computational modelling, materials or device work, and sound experimental reasoning. The strongest evidence will be a clear explanation of a previous research question, methods, personal contribution, results, and limitations, mapped to one or two project strands. UELA's application asks for short answers on motivation, suitability, knowledge and skills, and a prior research project; it emphasizes specific examples over generic claims. The official applicant guide describes these prompts.

Next Actions and Questions to Verify

Before Applying

• Confirm Home-fee eligibility and the project's Home-only restriction directly with UCL; do this before drafting the application around the position.
• Ask the supervisor which research direction will anchor the thesis, what the first-year work package is, and what milestones will support submission within the funded four years.
• Confirm the exact two-reference process and aim for the recommended 16 December 2026 submission date.

At Interview

• Ask which modelling, fabrication, materials, and mid-infrared characterisation facilities are confirmed for the student, and what training is provided.
• Clarify whether the PI's ERC project or any industrial collaborator has a formal role, resources, co-supervision, or placement attached to this studentship.
• Ask how the group will define scale-up or integration success and account for real environmental conditions.

Before Accepting an Offer

• Confirm the final Home tuition rate, stipend payment schedule, RTSG allocation, and whether any additional fee element applies.
• Review formal UCL admission conditions, the MPhil-to-PhD transfer milestone, project supervision arrangements, and the four-year submission plan.
• Build a personal London budget using current housing options, discretionary costs, and relocation expenses.

Evidence and Sources

Project, programme, and application

• UELA 2027–28 project catalogue, project 2531cs1053
• UELA 2027–28 funding and application information
• UELA 2027–28 applicant guide
• UCL Electronic and Electrical Engineering MPhil/PhD course
• EEE MPhil/PhD department research-degree page
• UCL graduate entry requirements
• EEE postgraduate research overview
• UCL postgraduate research fee schedule, 2026–27
• UCL student cost guide

University and research environment

• UCL institutional REF 2021 summary
• UCL Engineering REF 2021 summary
• Photonics Innovations Lab overview
• PI Lab team
• Ioannis Papakonstantinou — UCL profile
• UCL ERC Advanced Grant announcement

Publications and field context

• Li et al., 2025 team paper
• Ramirez-Cuevas et al., 2024 team paper
• Pattelli and Papakonstantinou, 2024 review
• 2026 selective-emitter preprint
• PI ORCID works record
• SINCERE project publication list
• Light: Science & Applications PI profile, 2026
• RSC review of radiative-cooling design and applications, 2024
• Next Energy review of real-world applications, 2024
• IEA, The Future of Cooling
• IEA, Space Cooling, 2023
• UK Clean Energy Jobs Plan