Journal
ACS PHOTONICS
Volume 7, Issue 3, Pages 646-652Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.9b01418
Keywords
photoacoustics; gold nanoparticles; biomedical imaging; theoretical modeling; plasmon resonance
Categories
Funding
- European Commission (EUSMI) [731019]
- DFG (German Science Foundation) [SFB 985]
- Spanish MINECO [MAT2017-86659-R]
- Maria de Maeztu Units of Excellence Program from the Spanish State Research Agency [MDM-2017-0720]
- DFG through the Heisenberg Fellowship [CH 407/7-2]
- EPSRC [EP/K005014/1] Funding Source: UKRI
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Photoacoustics is an upcoming modality for biomedical imaging, which promises minimal invasiveness at high penetration depths of several centimeters. For superior photoacoustic contrast, imaging probes with high photothermal conversion efficiency are required. Gold nanoparticles are among the best performing photoacoustic imaging probes. However, the geometry and size of the nanoparticles determine their photothermal efficiency. We present a systematic theoretical analysis to determine the optimum nanoparticle geometry with respect to photoacoustic efficiency in the near-infrared spectral range, for superior photoacoustic contrast. Theoretical predictions are illustrated by experimental results for two of the most promising nanoparticle geometries, namely, high aspect ratio gold nanorods and gold nanostars.
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