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| howto:antibunching_measurements [2014/02/21 09:52] – admin | howto:antibunching_measurements [2015/02/25 13:55] – bornemann |
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| ~~TOC~~ | ~~TOC~~ |
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| ====== How to perform Antibunching Measurements ====== | ====== How to Perform Antibunching Measurements ====== |
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| ===== Emission Filters ===== | ===== Emission Filters ===== |
| During Antibunching Measurements the [[Glossary:afterglow effect]] of the [[Glossary:SPADs]] may become visible as (un)expected additional peaks near the expected antibunching dip (see figure 2). These peaks might be useful to find the location of the dip, they are however artifacts caused by photons emitted (after the detection of a genuine photon) by one SPAD detected by the second SPAD. The distance of the expected dip and the afterglow peak is characteristic for the setup. | During Antibunching Measurements the [[Glossary:afterglow effect]] of the [[Glossary:SPADs]] may become visible as (un)expected additional peaks near the expected antibunching dip (see figure 2). These peaks might be useful to find the location of the dip, they are however artifacts caused by photons emitted (after the detection of a genuine photon) by one SPAD detected by the second SPAD. The distance of the expected dip and the afterglow peak is characteristic for the setup. |
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| To get rid of the afterglow peak it has been proven useful to introduce 2 identical bandpasses directly in front of each [[Glossary:SPAD]] and to use a 50:50 beamsplitter plate instead of a beamsplitter cube or to misalign the detectors slightly.(( The [[afterglow effect]] of [[MPD]] SPADs for Atto488 (485 nm excitation) could be eliminated by inserting one 536/40 bandpass in front of SPAD 2 (510LP in the filter wheel). For quantum dots the afterglow effect could be eliminated by using only one 593/40 bandpass in front of SPAD 2 (excitation @ 405 nm or 485 nm) )) | To get rid of the afterglow peak it has been proven useful to introduce 2 identical bandpasses directly in front of each [[Glossary:SPAD]] and to use a 50:50 beamsplitter plate instead of a beamsplitter cube or to misalign the detectors slightly.(( The [[glossary:afterglow effect]] of [[products:MPD]] SPADs for Atto488 (485 nm excitation) could be eliminated by inserting one 536/40 bandpass in front of SPAD 2 (510LP in the filter wheel). For quantum dots the afterglow effect could be eliminated by using only one 593/40 bandpass in front of SPAD 2 (excitation @ 405 nm or 485 nm) )) |
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| ===== Antibunching using Symphotime ===== | ===== Antibunching using Symphotime ===== |
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| *with [[Products:PicoHarp 300]] in [[glossary:T3-mode]] | *with [[Products:PicoHarp 300]] in [[glossary:T3-mode]] |
| *not possible with the [[Products:SymPhoTime#SymPhoTime32]], because in [[Products:SymPhoTime#SymPhoTime32]] the [[Glossary:Sync Divider]] is always active and set to 8 | *not possible with the [[software:SymPhoTime32]], because in [[software:SymPhoTime32]] the [[Glossary:Sync Divider]] is always active and set to 8 |
| *data acquisition is possible with the [[Products:PicoHarp 300]]/[[Products:HydraHarp 400]] software as well as with [[Products:SymPhoTime#SymPhoTime64]], where the sync divider can be disabled. With HH, don't use use SYNC channel as input for one detector, but e.g. Ch. 1+2. SYNC must be plugged in. Unfortunately, analysis of HH T3-antibunching data is not implemented in SPT. | *data acquisition is possible with the [[Products:PicoHarp 300]]/[[Products:HydraHarp 400]] software as well as with [[software:SymPhoTime64]], where the sync divider can be disabled. With HH, don't use use SYNC channel as input for one detector, but e.g. Ch. 1+2. SYNC must be plugged in. Unfortunately, analysis of HH T3-antibunching data is not implemented in SPT. |
| *with [[Products:PicoHarp 300]]/[[Products:HydraHarp 400]] in [[glossary:T2-mode]] | *with [[Products:PicoHarp 300]]/[[Products:HydraHarp 400]] in [[glossary:T2-mode]] |
| *measurements are possible with the [[Products:SymPhoTime]] | *measurements are possible with the [[software:SymPhoTime64]] |
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| ==== Changing from Normal Acquisition (T3-mode) to Antibunching (T2-mode) ==== | ==== Changing from Normal Acquisition (T3-mode) to Antibunching (T2-mode) ==== |
