howto:t3r_antibunching_-_slow_decay
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howto:t3r_antibunching_-_slow_decay [2013/08/06 15:03] – admin | howto:t3r_antibunching_-_slow_decay [2022/02/01 10:54] – [A.: The decay can be caused by blinking of the nanodiamonds.] peter | ||
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- | /* ====== | + | {{tag> antibunching T3-mode T2-mode}} |
+ | ~~TOC~~ | ||
+ | ====== | ||
- | ===== Q.: How can we avoid decay at very long time delay (up to 5us)? ===== | ||
- | ==== In this show-case the external preconditions are: ==== | ||
- | - detectors: perkin elmer SPCMAQR14 | ||
- | - 700 nm SP filter in front of one of the apds | ||
- | - sample: diamond nanocrystals (100 nm), we are measuring the antibunching of the NV centers emission | ||
- | |||
- | - laser wavelength: 532 nm, cw | ||
- | |||
- | - T3R Measurement with PicoHarp Software | ||
- | |||
- | ===== A.: The decay can be caused by blinking of the nanodiamonds. ===== | ||
==== A decay caused by correlation statistics ==== | ==== A decay caused by correlation statistics ==== | ||
- | + | This decay is caused by correlation statistics. This happens because you correlate the first arriving photon against a photon at the longer time, which will be an increasingly unlikely event because the earliest stop photons always win and the experiment restarts. | |
- | On top of an eventual blinking you will have a decay caused by correlation statistics. | + | |
- | + | ||
- | This happens because you correlate the first arriving photon against a photon at the longer time, | + | |
- | + | ||
- | which will be an increasingly unlikely event because the earliest stop photons always win and the experiment restarts. | + | |
I attached a simulation. | I attached a simulation. | ||
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- | \\ ==== You will I need the raw data ==== | + | \\ |
- | + | The timescale is in ns. The plateau is the [[glossary:dead time]]. The decay slope depends on the count rate. | |
- | The timescale is in ns. The plateau is the dead-time. The decay slope depends on the count rate. | + | |
- | + | ||
- | You can zoom into your data and you will see roughly the same behavior - linear decay after the dead-time, which than of course is overshadowed by the background. | + | |
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- | + | ||
- | The way to avoid this is is to calculate the total correlation. This is not a start-stop correlation but the correlation of every photon against every photon. | + | |
- | It can be done measuring in T2 mode and then correlating using the SymPhoTime Software (http:// | + | The way to avoid this is to calculate the total correlation after T2 MODE MEASUREMENT. This is not a start-stop correlation but the correlation of every photon against every photon. |
- | For a trial you will I need the raw data - a pt2 file containing all the photon data - not just the correlated curve. You can record this using the button I highlighted in the attached screenshot. | + | It can be done using the SymPhoTime Software (http:// |
- | */ |
howto/t3r_antibunching_-_slow_decay.txt · Last modified: 2022/02/01 11:32 by peter