NDLI: Very high-sensitivity tunable phase detection of light power variations using electrical modulation of Si-photodiode in photovoltaic regime

Content Provider	IET Digital Library
Author	Marcellis, A. De Janneh, M. Palange, E.
Abstract	The use of a silicon (Si)-photodiode (Si-PD) operating in photovoltaic mode as a tunable very high-sensitivity phase detector of light power variations is demonstrated. This result is reached by applying to the Si-PD an electrical modulation through an AC excitation signal without a DC reverse bias. This allows employing the synchronous demodulation technique for phase detection that shows much better performances with respect to the conventional amplitude measurements, mainly overcoming the issues related to the electrical noise and the resolution limitation due to the selected full scale. The phase variations to be detected occur between the modulating signal and the one provided by the Si-PD as a function of the light power variations on its sensitive area. The proposed approach notably simplifies both the electronic circuitry and the optical setup, minimising the detection system complexity and size. Experimental results demonstrate that it is possible to achieve phase detection sensitivity, with respect to light power variations, of up to 410°/μW as a function of the Si-PD settable operating conditions. Using a standard commercial lock-in amplifier with a 0.01° phase resolution is possible to obtain a light power resolution of up to 25 pW.
Starting Page	282
Ending Page	284
Page Count	3
ISSN	00135194
Volume Number	51
e-ISSN	1350911X
Issue Number	Issue 3, Feb (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/51/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2014.3763
Journal	Electronics Letters
Publisher Date	2015-01-23
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Excitation Signal Amplifiers Amplitude Measurement DC Reverse Bias Demodulation Demodulator Discriminators And Mixers Electrical Modulation Electrical Noise Elemental Semiconductor Infrared Detector Light Power Resolution Light Power Variation Lock-in Amplifier Modulator Optical Set-up Minimisation Phase Detector Phase Modulation Phase Resolution PhotoDetector PhotoDiode Photoelectric Device Photovoltaic Regime Si-PD Silicon Silicon-photodiode Synchronous Demodulation Technique Very High-sensitivity Tuneable Phase Detection
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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