Publications

You can also find my articles on my Google Scholar profile.

Preprints

29. Efficient short-wave infrared upconversion by self-sensitized holmium-doped nanoparticles

Arul, R., Jiang, Z., Li, X., Bell, F.M., Tew, A., Ducati, C., Rao, A., & Yu, Z. (2024) Arxiv

https://arxiv.org/abs/2411.19949 | Download Manuscript

2025

33. Tracking and controlling monolayer water in gold nanogaps using extreme plasmonic spectroscopy

Wyatt, E. W., Sibug-Torres, S.M., Arul, R., Niihori, M.N., Jones, T., Beattie, J.W., Nijs, B.D., & Baumberg, J.J. (2025) Small 1 (49), e07013

https://onlinelibrary.wiley.com/doi/10.1002/smll.202507013 | Download Manuscript

32. Triplets electrically turn on insulating lanthanide-doped nanoparticles

Yu, Z., Deng, Y., Ye, Junzhi, van Turnhout, L., Liu, T., Tew, A., Arul, R., Dowland, S., Sun, Y., Li, X., Dai, L., Lu, Y., Ducati, C., Baumberg, J., Friend, R., Hoye, R., & Rao, A. (2025). Nature 647 (8090), 625-631

https://www.nature.com/articles/s41586-025-09601-y | Download Manuscript

31. Transient Au–Cl adlayers modulate the surface chemistry of gold nanoparticles during redox reactions

Sibug-Torres, S. M., Niihori, M., Wyatt, E.W., Arul, R., Spiesshofer, N., Jones, T., Graham, D., de Nijs, B., Scherman, O., Rao, R., Ryan, M., Squires, A., Savory, C., Scanlon, D., Daaoub, A., Sangtarash, S., Sadeghi, H., & Baumberg, J.J. (2025). Nature Chemistry.

https://www.nature.com/articles/s41557-025-01989-4 | Download Manuscript

30. Molecular Orientation Controls Triplet Exciton Dynamics in Organic Molecules Coupled to Lanthanide-Doped Nanoparticles

van Turnhout, L., Tew, A., Dowland, S. A., Sebastian, E., Jiang, Z., Arul, R., Yu, Z., & Rao, A. (2025). Journal of the American Chemical Society 147 (41), 37788-37797.

https://pubs.acs.org/doi/full/10.1021/jacs.5c13962 | Download Manuscript

29. Tailoring ultrahigh index plasmonic combinatorial metamaterials for SEIRA and SERS by tuning the fill fraction

Spiesshofer, N., Wyatt, E., Sztranyovszky, Z., Todd, C., Mykytiuk, T. V., Beattie, J. W., Davies, R., Arul, R., Lindo, V., Krauss, T.F., Demetriadou, A., & Baumberg, J. J. (2025). Optica, 12(9), 1357-1366.

https://opg.optica.org/optica/fulltext.cfm?uri=optica-12-9-1357 | Download Manuscript

28. Coherent Dynamics of Molecular Vibrations in Single Plasmonic Nanogaps

Bell, F.M., Jakob L.A., Todd C.A., Lohia I., Roh, Y., Arul, R., & Baumberg, J. J. (2025). Physical Review Letters 135, 076901

https://doi.org/10.1103/txdw-nqvn | Download Manuscript

27. Optical Control of Single Atom Dynamics in Plasmonic Nanogaps

Kerner, P., Arul, R., Thompson, D., Baumberg, J. J., & Nijs, B.D. (2025) Science Advances 11, no. 29 eadx3216

https://doi.org/10.1126/sciadv.adx3216 | Download Manuscript

26. Optomechanical Pumping of Collective Molecular Vibrations in Plasmonic Nanocavities

Jakob, L., Juan-Delgado, A., Mueller, N.S., Hu, S., Arul, R., Boto, R., Esteban, R., Aizpurua, J., & Baumberg, J.J. (2025) ACS Nano 19 (11), 10977-10988

https://doi.org/10.1021/acsnano.4c16535 | Download Manuscript

2024

25. Design rules for catalysis in single-particle plasmonic nanogap reactors with precisely aligned molecular monolayers

Kang, G., Hu, S., Guo, C., Arul, R., Sibug‑Torres, S. M., & Baumberg, J. J. (2024) Nature Communications, 15(1), 9220

https://doi.org/10.1038/s41467-024-53544-3 | Download Manuscript

24. Distance-Independent Efficiency of Triplet Energy Transfer from π-Conjugated Organic Ligands to Lanthanide-Doped Nanoparticles

van Turnhout, L., Congrave, D. G., Yu, Z., Arul, R., Dowland, S. A., Sebastian, E., Jiang, Z., Bronstein, H., & Rao, A. (2024). Journal of the American Chemical Society, 146, 32, 22612-22621

https://doi.org/10.1021/jacs.4c07004 | Download Manuscript

23. Robust consistent single quantum dot strong coupling in plasmonic nanocavities

Hu, S., Huang, J., Arul, R., Sanchez-Iglesias, A., Xiong, Y., Liz-Marzan, L., & Baumberg, J.J. (2024) Nature Communications, 15, 6835

https://doi.org/10.1038/s41467-024-51170-7 | Download Manuscript

22. Heterostructures enhance the absorption of lanthanides

Tew, A., van Turnhout, L., Deng, Y., Arul, R., Ye, J., Liu, T., Jiang, Z., Dai. L., Zhu, H., Zhang, Y., Rao, A., & Yu, Z. (2024) Applied Physics Reviews, 11, 2

https://doi.org/10.1063/5.0204199 | Download Manuscript

21. Direct linearly polarized electroluminescence from perovskite nanoplatelet superlattices

Ye, J., Ren, A., Dai, L., Baikie, T., Guo, R., Pal, D., Gorgon, S., Heger, J.E., Huang, J., Sun, Y., Arul, R., Grimaldi, G., Zhang, K., Shamsi, J., Huang, Y.T., Wang, H., Wu, J., Koenderink, A.F., Murciano, L.T., Schwartzkopf, M., Roth, S.V., Muller-Buschbaum, P., Baumberg, J.J., Stranks, S.D., Greenham, N.C., Polavarapu, L., Zhang, W., Rao, A., and Hoye, R.L.Z. (2024) Nature Photonics, 18, 586–594.

https://doi.org/10.1038/s41566-024-01398-y | Download Manuscript

20. Accelerated molecular vibrational decay and suppressed electronic nonlinearities in plasmonic cavities through coherent Raman scattering

Jakob, L.A., Deacon, W.M., Arul, R., de Nijs, B. & Baumberg, J.J. (2024) Phys. Rev. B, 109, 195404.

https://doi.org/10.1103/PhysRevB.109.195404 | Download Manuscript

19. Extensive photochemical restructuring of molecule-metal surfaces under room light

Guo, C., Benzie, P.A., Hu, S., Nijs, B.D., Miele, E., Elliot, E.E., Arul, R., Benjamin, H., Baumberg, J.J. (2024) Nature Communications, 15, 1928.

https://doi.org/10.1038/s41467-024-46125-x | Download Manuscript

2023

18. SERS sensing of dopamine with Fe (III)‐sensitized nanogaps in recleanable AuNP monolayer films

Niihori, M, Foldes, T., Arul, R., Grys, D.B., Readman, C., de Nijs, B., Rosta, E., & Baumberg, J.J. (2022) Small, 19 (48), 2302531.

https://doi.org/10.1002/smll.202302531 | Download Manuscript

17. Single-molecule mid-infrared spectroscopy and detection through vibrationally assisted luminescence

Chikkaraddy, R., Arul, R., Jakob, L. A., & Baumberg, J. J. (2023). Nature Photonics, 17, 865–871.

https://doi.org/10.1038/s41566-023-01263-4 | Download Manuscript

16. Raman Probing the Local Ultrastrong Coupling of Vibrational Plasmon Polaritons on Metallic Gratings

Arul, R., Menghrajani, K., Chikkaraddy, R., Rider, M.S., Barnes, W.L., & Baumberg, J.J. (2023). Physical Review Letters, 131, 126902.

https://doi.org/10.1103/PhysRevLett.131.126902 | Download Manuscript

15. Photoluminescence upconversion in monolayer WSe2 activated by plasmonic cavities through resonant excitation of dark excitons

Mueller, N.S., Arul, R., Saunders, A., Johnson, A., Sanchez-Iglesias, A., Hu, S., Jakob, L.A., Bar‑David, J., Nijs, B.D., Liz-Marzan, L., Liu, F., & Baumberg, J. J. (2023). Nature Communications, 14, 5726.

https://www.nature.com/articles/s41467-023-41401-8 | Download Manuscript

14. Controlling atomic-scale restructuring and cleaning of gold nanogap multilayers for surface-enhanced Raman scattering sensing

Grys, D.B., Niihori, M., Arul, R., Sibug-Torres, S.M., Wyatt, E., Nijs, B.D., & Baumberg, J.J. (2023). ACS Sensors, 8, 7, 2879–288

https://doi.org/10.1021/acssensors.3c00967 | Download Manuscript

13. Direct laser writing of hydrophobic and hydrophilic valves in the same material applied to centrifugal microfluidics

Vargas, M.J.T., Nieuwoudt, M.K., Arul, R., Williams, D.E., Simpson, M.C. (2023) RSC Advances, 13 (32), 22302-22314.

https://pubs.rsc.org/en/content/articlehtml/2023/ra/d3ra01749d | Download Manuscript

12. Understanding the chemical mechanism behind photoinduced enhanced Raman spectroscopy

Arul, R., Ye, J., Nieuwoudt, M. K., Dong, J., Gao, W., & Simpson, M. C. (2023). The Journal of Physical Chemistry Letters. 14 (19), 4607-4616.

https://doi.org/10.1021/acs.jpclett.3c00478 | Download Manuscript

2022

11. The effect of caesium alloying on the ultrafast structural dynamics of hybrid organic–inorganic halide perovskites

Gallop, N.P., Ye, J., Greetham, G., Jansen, T.L.C., Dai, L., Zelewski, S., Arul, R., Baumberg, J.J., Hoye, R.L.Z. & Bakulin, A.A. (2022). Journal of Materials Chemistry A, 10(42), 22408-22418.

https://doi.org/10.1039/D2TA05207E | Download Manuscript

10. Giant mid-IR resonant coupling to molecular vibrations in sub-nm gaps of plasmonic multilayer metafilms

Arul, R., Benjamin Grys, D., Chikkaraddy, R., Mueller, N. S., Xomalis, A., Miele, E., Euser, T.E. & Baumberg, J. J (2022) Light: Science and Applications 11, 281

https://doi.org/10.1038/s41377-022-00943-0 | Download Manuscript

9. Collective Mid-Infrared Vibrations in Surface-Enhanced Raman Scattering

Mueller, N.S., Arul, R., Jakob, L.A., Blunt, M., Foldes, T., Rosta, E., & Baumberg, J.J. (2022). ACS Nano Letters 22, 17, 7254–7260

https://doi.org/10.1021/acs.nanolett.2c02806 | Download Manuscript

8. Theory of strong coupling between molecules and surface plasmons on a grating

Rider, M. S., Arul, R., Baumberg, J. J., & Barnes, W. L. (2022). Nanophotonics. 11, 16, 3695-3708.

https://doi.org/10.1515/nanoph-2022-0301 | Download Manuscript

7. Elucidating the Role of Antisolvents on the Surface Chemistry and Optoelectronic Properties of CsPbBrxI3-x Perovskite Nanocrystal

Ye, J., Li, Z., Kubicki, D.J., Zhang, Y., Dai, L., Otero-Martínez, C., Reus, M.A., Arul, R., …, Rao, A. and Hoye, R.L.Z. (2022). Journal of the American Chemical Society. 144, 27, 12102–12115.

https://pubs.acs.org/doi/full/10.1021/jacs.2c02631 | Download Manuscript