Re: Noise levels as a function of pixel size

Scott W wrote:

I think it helps to look at this graphically.  I plotted the
probability distribution for a  0.55 um photon imaged with a lens
having an NA of 1.6, I used 0.002 um / pixel as a way to plot this out.
 I have translated from linear space to sRGB to get it to display on
computer screen correctly.   I have also superimposed a square that is
0.086 um on a side to get an relative idea of the size of the proposed
photo sensor.
http://www.pbase.com/konascott/image/54680617/original
Now nobody is imaging to this limit, this is the limit that you can't
go past if the sensor has N=1.6. I do have a lens that is at NA=1.25
(works at N= 1.5 or so)however so this is not way out of the ball park.


Scott,
What equations did you use to calculate this figure?  The problem I
see with it is the diameter of the first zero ring is less than the
wavelength of green light, so I wonder if you used the >wavelength
equations down to this limit.  The equations get more
complex as the size of the disk approaches the wavelength of
light and the spot size would be larger.

Roger
.

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