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Fourier domain rotational anisotropy-second harmonic generation
Lu, B Torchinsky, DH
Lu, B
Torchinsky, DH
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2018-12-10
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10.1364/OE.26.033192
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© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement We describe a novel scheme of detecting rotational anisotropy-second harmonic generation (RA-SHG) signals using a lock-in amplifier referenced to a fast scanning RA-SHG apparatus. The method directly measures the nth harmonics of the scanning frequency corresponding to SHG signal components of Cn symmetry that appear in a Fourier series expansion of a general RA-SHG signal. GaAs was used as a test sample allowing comparison of point-by-point averaging with the lock-in based method. When divided by the C∞ signal component, the lock-in detected data allowed for both self-referenced determination of ratios of Cn components of up to 1 part in 104 and significantly more sensitive measurement of the relative amount of different Cn components when compared with conventional methods.
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