Brian O'callahan

1.2k total citations
34 papers, 909 citations indexed

About

Brian O'callahan is a scholar working on Biomedical Engineering, Electronic, Optical and Magnetic Materials and Atomic and Molecular Physics, and Optics. According to data from OpenAlex, Brian O'callahan has authored 34 papers receiving a total of 909 indexed citations (citations by other indexed papers that have themselves been cited), including 18 papers in Biomedical Engineering, 15 papers in Electronic, Optical and Magnetic Materials and 10 papers in Atomic and Molecular Physics, and Optics. Recurrent topics in Brian O'callahan's work include Gold and Silver Nanoparticles Synthesis and Applications (11 papers), Plasmonic and Surface Plasmon Research (9 papers) and Near-Field Optical Microscopy (7 papers). Brian O'callahan is often cited by papers focused on Gold and Silver Nanoparticles Synthesis and Applications (11 papers), Plasmonic and Surface Plasmon Research (9 papers) and Near-Field Optical Microscopy (7 papers). Brian O'callahan collaborates with scholars based in United States, Singapore and Japan. Brian O'callahan's co-authors include Markus B. Raschke, Andrew C. Jones, Patrick Z. El‐Khoury, Joanna M. Atkin, David Cobden, Jae Hyung Park, Samuel Berweger, Justin A. Gerber, Chih-Feng Wang and Honghua Yang and has published in prestigious journals such as Physical Review Letters, Nature Communications and The Journal of Chemical Physics.

In The Last Decade

Brian O'callahan

33 papers receiving 890 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Brian O'callahan United States 16 373 301 283 249 226 34 909
Elena Messina Italy 23 726 1.9× 583 1.9× 198 0.7× 559 2.2× 219 1.0× 48 1.5k
Manohar Chirumamilla Denmark 19 668 1.8× 820 2.7× 268 0.9× 343 1.4× 291 1.3× 44 1.4k
Francesco Rossella Italy 22 547 1.5× 207 0.7× 382 1.3× 806 3.2× 575 2.5× 96 1.4k
Jared K. Day United States 7 736 2.0× 665 2.2× 239 0.8× 338 1.4× 260 1.2× 8 1.7k
Derek Nowak United States 11 343 0.9× 55 0.2× 342 1.2× 140 0.6× 238 1.1× 29 740
Shankar Ghosh India 15 673 1.8× 168 0.6× 223 0.8× 676 2.7× 356 1.6× 61 1.4k
Bastian Barton Germany 18 150 0.4× 37 0.1× 113 0.4× 357 1.4× 165 0.7× 51 923
David T. Schoen United States 19 653 1.8× 461 1.5× 265 0.9× 826 3.3× 802 3.5× 20 1.5k
Wan-Sheng Su Taiwan 19 223 0.6× 98 0.3× 309 1.1× 1.1k 4.5× 507 2.2× 89 1.6k
Maria Timofeeva Russia 16 539 1.4× 203 0.7× 386 1.4× 243 1.0× 423 1.9× 36 926

Countries citing papers authored by Brian O'callahan

Since Specialization
Citations

This map shows the geographic impact of Brian O'callahan's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Brian O'callahan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Brian O'callahan more than expected).

Fields of papers citing papers by Brian O'callahan

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Brian O'callahan. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Brian O'callahan. The network helps show where Brian O'callahan may publish in the future.

Co-authorship network of co-authors of Brian O'callahan

This figure shows the co-authorship network connecting the top 25 collaborators of Brian O'callahan. A scholar is included among the top collaborators of Brian O'callahan based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Brian O'callahan. Brian O'callahan is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Fraund, Matthew, Ryan C. Moffet, Zheng Fang, et al.. (2025). Spectro-microscopic analysis of soot particle composition and source attribution. Aerosol Science and Technology. 1–17. 2 indexed citations
2.
Rahaman, Mahfujur, Emanuele Marino, Alan G. Joly, et al.. (2024). Tunable Localized Charge Transfer Excitons in Nanoplatelet–2D Chalcogenide van der Waals Heterostructures. ACS Nano. 18(23). 15185–15193. 6 indexed citations
3.
Joly, Alan G., Chih-Feng Wang, Ti Xie, et al.. (2024). Strong Surface-Enhanced Coherent Phonon Generation in van der Waals Materials. The Journal of Physical Chemistry Letters. 15(42). 10442–10450. 1 indexed citations
4.
Adhikari, Kaushik, Anton F. Astner, Jennifer M. DeBruyn, et al.. (2023). Earthworms Exposed to Polyethylene and Biodegradable Microplastics in Soil: Microplastic Characterization and Microbial Community Analysis. ACS Agricultural Science & Technology. 3(4). 340–349. 27 indexed citations
5.
Tomlin, Jay M., Brian O'callahan, Matthew Fraund, et al.. (2023). Chemical characterization of microplastic particles formed in airborne waste discharged from sewer pipe repairs. Environmental Science Processes & Impacts. 25(10). 1718–1731. 5 indexed citations
6.
Primera-Pedrozo, Oliva M., Difan Zhang, Brian O'callahan, et al.. (2023). Influence of surface and intermolecular interactions on the properties of supported polyoxometalates. Nanoscale. 15(12). 5786–5797. 10 indexed citations
7.
Gwalani, Bharat, Mayur Pole, Shuang Li, et al.. (2022). Atomistic understanding of extreme strain shear deformation of Copper-Graphene composites. Carbon. 198. 63–69. 6 indexed citations
8.
Tomlin, Jay M., Christopher P. West, Brandon E. Boor, et al.. (2022). Atmospheric emission of nanoplastics from sewer pipe repairs. Nature Nanotechnology. 17(11). 1171–1177. 45 indexed citations
9.
O'callahan, Brian, Kyoung‐Duck Park, Irina Novikova, et al.. (2020). In Liquid Infrared Scattering Scanning Near-Field Optical Microscopy for Chemical and Biological Nanoimaging. Nano Letters. 20(6). 4497–4504. 38 indexed citations
10.
Wang, Chih-Feng, Zhihua Cheng, Brian O'callahan, et al.. (2020). Tip-Enhanced Multipolar Raman Scattering. The Journal of Physical Chemistry Letters. 11(7). 2464–2469. 32 indexed citations
11.
Wang, Chih-Feng, Brian O'callahan, Dmitry Kurouski, et al.. (2020). Suppressing Molecular Charging, Nanochemistry, and Optical Rectification in the Tip-Enhanced Raman Geometry. The Journal of Physical Chemistry Letters. 11(15). 5890–5895. 30 indexed citations
12.
O'callahan, Brian, Ashish Bhattarai, Zachary D. Schultz, & Patrick Z. El‐Khoury. (2020). Power-Dependent Dual Analyte Tip-Enhanced Raman Spectral Imaging. The Journal of Physical Chemistry C. 124(28). 15454–15459. 4 indexed citations
13.
O'callahan, Brian, Mario Hentschel, Markus B. Raschke, Patrick Z. El‐Khoury, & Scott Lea. (2019). Ultrasensitive Tip- and Antenna-Enhanced Infrared Nanoscopy of Protein Complexes. The Journal of Physical Chemistry C. 123(28). 17505–17509. 19 indexed citations
14.
Maia, Francisco C. B., Brian O'callahan, Alisson R. Cadore, et al.. (2019). Anisotropic Flow Control and Gate Modulation of Hybrid Phonon-Polaritons. Nano Letters. 19(2). 708–715. 29 indexed citations
15.
O'callahan, Brian, Kevin T. Crampton, Irina Novikova, et al.. (2018). Imaging Nanoscale Heterogeneity in Ultrathin Biomimetic and Biological Crystals. The Journal of Physical Chemistry C. 122(43). 24891–24895. 13 indexed citations
16.
O'callahan, Brian, Jun Yan, Fabian Menges, Eric A. Muller, & Markus B. Raschke. (2018). Photoinduced Tip–Sample Forces for Chemical Nanoimaging and Spectroscopy. Nano Letters. 18(9). 5499–5505. 41 indexed citations
17.
O'callahan, Brian, et al.. (2015). Broadband infrared vibrational nano-spectroscopy using thermal blackbody radiation. Optics Express. 23(25). 32063–32063. 16 indexed citations
18.
O'callahan, Brian, Andrew C. Jones, Jae Hyung Park, et al.. (2015). Inhomogeneity of the ultrafast insulator-to-metal transition dynamics of VO2. Nature Communications. 6(1). 6849–6849. 151 indexed citations
19.
O'callahan, Brian, William Lewis, Andrew C. Jones, & Markus B. Raschke. (2014). Spectral frustration and coherence in thermal near-field spectroscopy. Bulletin of the American Physical Society. 2014.
20.
Jones, Andrew C., Brian O'callahan, Honghua Yang, & Markus B. Raschke. (2013). The thermal near-field: Coherence, spectroscopy, heat-transfer, and optical forces. Progress in Surface Science. 88(4). 349–392. 63 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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