[Homer-users] A problem about develop Two-detector Corrected NIRS device

[a]

Hello, everyone.
Recently, I am developing a Two-detector Corrected NIRS device, using a extra short separation(about 5-10mm) detector.
The problem is: the detector I used in my device is a monolithic photodiode(OPT101) and the size is too large for a 5-10mm separation. So can you recommend a smaller photodiode? 
Attachment of the shopping website will be very apprecited~
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