Study of optical properties of electropolymerized melanin films by photopyroelectric spectroscopy
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Photopyroelectric (PPE) spectroscopy, in the 350–1,075 nm wavelength range, was used to study the optical properties of electropolymerized melanin films on indium tin oxide (ITO) coated glass. The PPE intensity signal as a function of the wavelength λ, V n(λ) and its phase F n(λ) were independently measured. Using the PPE signal intensity and the thermal and optical properties of the pyroelectric detector, we were able to calculate the optical absorption coefficient β of melanin in the solid-state. We believe this to be the first such measurement of its kind on this material. Additionally, we found an optical gap in these melanin films at 1.70 eV.
KeywordsMelanin Photopyroelectric spectroscopy Optical properties
J. E. de Albuquerque acknowledges UFV for sabbatical leave. This work was partially funded by the Australian Research Council (DP0345309) and by the MURI Center for Photonic Quantum Information Systems, ARO/ARDA Program No. DAAD19-03-1-0199.
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