A new optical front-end compensation technique for suppression of spurious signal in photoreflectance spectroscopy using an antiphase signal

Q. Li; H. H. Tan; C. Jagadish

doi:10.1063/1.3368598

A new optical front-end compensation technique for suppression of spurious signal in photoreflectance spectroscopy using an antiphase signal

Q. Li^*, H. H. Tan, C. Jagadish

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

A new optical front-end compensation technique to suppress the unwanted, spurious signal in photoreflectance (PR) spectroscopy is developed. In this approach an optical compensation signal, which is amplitude-matched to and in antiphase to the spurious signal, is introduced and directed to the photodetector. The combination of the compensation signal and the spurious signal results in a dc output from the photodetector which is thereafter suppressed by the lock-in amplifier, leaving only the true PR signal to be recovered and amplified. A high spurious signal suppression efficiency is demonstrated and the advantages of the technique are discussed.

Original language	English
Article number	043102
Journal	Review of Scientific Instruments
Volume	81
Issue number	4
DOIs	https://doi.org/10.1063/1.3368598
Publication status	Published - Apr 2010

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title = "A new optical front-end compensation technique for suppression of spurious signal in photoreflectance spectroscopy using an antiphase signal",

abstract = "A new optical front-end compensation technique to suppress the unwanted, spurious signal in photoreflectance (PR) spectroscopy is developed. In this approach an optical compensation signal, which is amplitude-matched to and in antiphase to the spurious signal, is introduced and directed to the photodetector. The combination of the compensation signal and the spurious signal results in a dc output from the photodetector which is thereafter suppressed by the lock-in amplifier, leaving only the true PR signal to be recovered and amplified. A high spurious signal suppression efficiency is demonstrated and the advantages of the technique are discussed.",

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AU - Jagadish, C.

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N2 - A new optical front-end compensation technique to suppress the unwanted, spurious signal in photoreflectance (PR) spectroscopy is developed. In this approach an optical compensation signal, which is amplitude-matched to and in antiphase to the spurious signal, is introduced and directed to the photodetector. The combination of the compensation signal and the spurious signal results in a dc output from the photodetector which is thereafter suppressed by the lock-in amplifier, leaving only the true PR signal to be recovered and amplified. A high spurious signal suppression efficiency is demonstrated and the advantages of the technique are discussed.

AB - A new optical front-end compensation technique to suppress the unwanted, spurious signal in photoreflectance (PR) spectroscopy is developed. In this approach an optical compensation signal, which is amplitude-matched to and in antiphase to the spurious signal, is introduced and directed to the photodetector. The combination of the compensation signal and the spurious signal results in a dc output from the photodetector which is thereafter suppressed by the lock-in amplifier, leaving only the true PR signal to be recovered and amplified. A high spurious signal suppression efficiency is demonstrated and the advantages of the technique are discussed.

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JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

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ER -

A new optical front-end compensation technique for suppression of spurious signal in photoreflectance spectroscopy using an antiphase signal

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