Abstract
The results of Stark hole burning of aluminum phthalocyanine tetrasulfonate (APT) in MCF-10F (normal) and MCF-7 (cancer) cells are reported. Hole broadening was observed for zero-phonon holes (ZPH) for both cell lines when laser polarization was parallel and perpendicular to an applied electric (Stark) field. Changes in dipole moment suggest that dye molecules are located near the cell membrane and, in normal cells, experience some degree of ordering not found in the cancer cells.
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