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| howto:antibunching_measurements [2019/07/26 07:12] – [Comments] buschmann | howto:antibunching_measurements [2023/09/07 11:10] – [Emission Filters] peter |
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| ===== Emission Filters ===== | ===== Emission Filters ===== |
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| 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 unexpected 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 of the SPADs, 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 [[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) )) | To get rid of the afterflash peak, it has been proven useful to introduce 2 identical bandpass filters directly in front of each [[Glossary:SPAD]] E.g. the [[glossary:afterglow effect]] of [[products:MPD]] SPADs for Atto488 (485 nm excitation, emission around 520 nm) could be eliminated by inserting one 536/40 bandpass filters in front of SPADs. |
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| | We recommend to use a 50:50 beam splitter plate instead of a beam splitter cube, or to intentionally misalign the detectors slightly. 2 (510LP in the filter wheel). |
| ===== Antibunching using Symphotime ===== | ===== Antibunching using Symphotime ===== |
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