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In this work, the terahertz (THz) absorption spectra of a typical protein BSA (Bovine Serum Albumin) in aqueous solution were measured under different pH conditions. The temporal changes in the absorption spectra were analyzed using the two-dimensional correlation spectroscopy (2DCOS). By comparing the cross peaks corresponding to the different pH values, it can be obtained that the conformation is...
We present the theory of fast electro-optic correlations when applied to quantized fields. We find that, contrary to standard spectrometry or Hanbury Brown and Twiss arrangements, which are inherently based on destructive detection, electro-optic correlations fulfill the conditions of quantum non-demolition measurements. This property allows most notably the measurement of first and second order correlation...
The pulse jitter of THz synchrotron radiation has been derived from the analysis of broadband cross-correlation measurements performed at the synchrotron Metrology Light Source. The pulse jitter is extracted by comparing equivalent autocorrelation measurements recorded with identical beam optics. A pulse jitter of 1.1 ps has been found.
We performed large scale classical molecular dynamics simulations (MDS) of a solvated microtubule (MT) composed of 42 tubulin heterodimers to examine vibrational energy absorption and dissipation mechanisms, and to describe the expected behavior of the MT following terahertz (THz) excitation. We computed MT absorption spectra and vibrational density of states in the THz regime, and performed an analysis...
This work utilizes xenograft murine breast cancer tumors to develop terahertz imaging methodology for freshly excised breast cancer tissue. Tumors are grown via cell injection into mice on a high-fat diet and excised for subsequent terahertz imaging. Following imaging of both freshly excised tumor bulk and interior cross-sections, the tumors are then subjected to histopathology processing for correlation...
We present the results on the emission characteristics of both Quantum Cascade Laser based frequency combs and combs based on optical rectification in photoconductive antennas operating at Terahertz frequencies using intensity autocorrelation by electro-optic sampling. We find the emission to be amplitude modulated when the laser operates in comb and in the dispersed regime. We further emphasize on...
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