howto:t3r_antibunching_-_slow_decay
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howto:t3r_antibunching_-_slow_decay [2015/06/03 15:07] – admin | howto:t3r_antibunching_-_slow_decay [2022/02/01 11:32] (current) – [A decay caused by correlation statistics] peter | ||
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- | {{tag> antibunching T2}} | + | {{tag> antibunching |
+ | ~~TOC~~ | ||
+ | ====== Artefacts in Antibunching Histograms - Slow Decay ====== | ||
- | ====== T3R Antibunching - Slow Decay ====== | ||
- | ===== 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 ==== | ||
- | On top of an eventual blinking you will have a decay caused by correlation statistics. | + | [{{howto: |
- | This happens because you correlate the first arriving photon against a photon at the longer time, | + | This decay is caused by correlation statistics. |
- | which will be an increasingly unlikely event because the earliest stop photons always win and the experiment restarts. | + | A simulation with 90ns dead-time period: |
- | I attached a simulation. | + | [{{howto: |
- | [{{howto: | ||
- | + | \\ | |
- | \\ ==== You will I need the raw data ==== | + | |
The timescale is in ns. The plateau is the [[glossary: | The timescale is in ns. The plateau is the [[glossary: | ||
- | You can zoom into your data and you will see roughly the same behavior - linear decay after the [[glossary: | + | The way to avoid this is to calculate the total correlation |
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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:// | + | |
- | 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