A team of researchers from Boston University and Tufts University, both in MA, USA, have recently published a paper about the IR detection of a vibrational signature from zeptomole levels of proteins.
They developed a nanoplasmonic technique adaptable to any commercial microscope, boosting the signal levels to 100,000 times for absorption spectroscopy.
You can read the full PDF version of this paper by clicking on the link below.
