W
W. Ranjith Premasiri
Researcher at Boston University
Publications - 21
Citations - 1332
W. Ranjith Premasiri is an academic researcher from Boston University. The author has contributed to research in topics: Raman spectroscopy & Raman scattering. The author has an hindex of 12, co-authored 19 publications receiving 1183 citations.
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Journal ArticleDOI
Engineered SERS substrates with multiscale signal enhancement: nanoparticle cluster arrays.
Bo Yan,Anupama J. Thubagere,W. Ranjith Premasiri,Lawrence D. Ziegler,Luca Dal Negro,Björn M. Reinhard +5 more
TL;DR: The observed dependencies of the Raman signals on n and Lambda indicate that NCAs support a multiscale signal enhancement which originates from simultaneous inter- and intracluster coupling and |E|-field enhancement.
Journal ArticleDOI
Plasmonic Nanogalaxies: Multiscale Aperiodic Arrays for Surface-Enhanced Raman Sensing
Ashwin Gopinath,Svetlana V. Boriskina,W. Ranjith Premasiri,Lawrence D. Ziegler,Björn M. Reinhard,Luca Dal Negro +5 more
TL;DR: Using rigorous generalized Mie theory calculations and a combined top-down/bottom-up nanofabrication approach, approximately 10(8) spatially averaged, reproducible SERS enhancement in deterministic aperiodic arrays of Au nanoparticles with different length scales are designed and experimentally demonstrated.
Journal ArticleDOI
The biochemical origins of the surface-enhanced Raman spectra of bacteria: a metabolomics profiling by SERS
W. Ranjith Premasiri,Jean C. Lee,Alexis F. Sauer-Budge,Roger Théberge,Catherine E. Costello,Lawrence D. Ziegler +5 more
TL;DR: The results provide the biochemical basis for the development of SERS as a rapid bacterial diagnostic and illustrate how SERS can be applied more generally for metabolic profiling as a probe of cellular activity.
Journal ArticleDOI
Urine analysis by laser Raman spectroscopy
TL;DR: The use of Raman spectroscopy to analyze components in human urine is examined to find out if it can be used to detect cancerous deposits in the blood.
Journal ArticleDOI
Engineering Nanoparticle Cluster Arrays for Bacterial Biosensing: The Role of the Building Block in Multiscale SERS Substrates
Linglu Yang,Bo Yan,W. Ranjith Premasiri,Lawrence D. Ziegler,Luca Dal Negro,Björn M. Reinhard +5 more
TL;DR: The role of the building block for the NCA performance is quantified in this paper, where periodic NCA with constant cluster diameter (D = 200 nm) but variable nanoparticle diameter (d) and intercluster separation (A) were assembled on glass and their optical response and SERS enhancement were systematically characterized as a function of D, A, and d.