Camera Technologies for Astronomy

Cern Courier Webinar Series - October 2012

QUESTIONS & ANSWERS
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The bright star survey telescope for the planetary transit survey in Antarctica
Evaluation of genetic damage in tobacco and arsenic exposed population of Southern Assam, India using buccal cytome assay and comet assay
Chloroquine-induced glioma cells death is associated with mitochondrial membrane potential loss, but not oxidative stress
First Demonstration of Imaging Cosmic Muons in a Two-Phase Liquid Argon TPC using an EMCCD Camera and a THGEM
The state of Pluto's atmosphere in 2012–2013
Superresolution imaging of single DNA molecules using stochastic photoblinking of minor groove and intercalating dyes
Receptor–Ligand Interactions: Binding Affinities Studied by Single‐Molecule and Super‐Resolution Microscopy on Intact Cells
Study of three 2013 novae: V1830 Aql, V556 Ser and V809 Cep
The influence of the tube diameter on the properties of an atmospheric pressure He micro-plasma jet
Super-resolution imaging of C-type lectin spatial rearrangement within the dendritic cell plasma membrane at fungal microbe contact sites
Point spread function optimization for STORM using adaptive optics
Click chemistry for the conservation of cellular structures and fluorescent proteins: ClickOx
Multiple Spatial and Kinetic Subpopulations of CaMKII in Spines and Dendrites as Resolved by Single-Molecule Tracking PALM
Micromirror structured illumination microscope for high-speed in vivo drosophila brain imaging
Optimising the signal-to-noise ratio in measurement of photon pairs with detector arrays
Statistics of twin-beam states by photon-number resolving detectors up to pump depletion
The Einstein-Podolsky-Rosen paradox in twin images
Spatial properties of twin-beam correlations at low-to high-intensity transition
Coherence properties of high-gain twin beams generated in pump-depletion regime
The planetary nebula IPHASXJ211420. 0+ 434136 (Ou5): insights into common-envelope dynamical and chemical evolution

1. What is limiting the full well of the sCMOS?

The full well capacity of the photodiode, the responsive region of the CMOS pixel, is ultimately limited by the volume of the depletion zone. The depletion zone is the region of the silicon which converts incident photons into photoelectrons and the depth is normal defined by the silicon dopant. This means that as a general rule of thumb the larger the pixel size (6.5um etc) the greater the amount of charge which can be held hence the greater Well depth capacity. This assumes efficent clocking structures and readout electronics

2. Is this available as a technical note pdf from andor? sCMOS and EMCCD?

We presently have a large number of technical notes and information freely available on our website, www.andor.com, which shows most of the comparison information that I covered in the webinar.

3. Does sCMOS go up to 4k x 4k 12um pixels 50mm sq?

No, this is the first of this new generation of sensors and cameras and as the first ground breaking product it is presently the only option available, we fully expect to develop more in the future so watch this space!

4. Colin didn't mention any structural differences between the EMCCD and CMOS. We think that the CMOS has a smaller fractional surface area (i.e. electronics take up some of the real estate). Could he please comment on this?

I briefly covered it when I showed the two structures side by side. You are correct the EMCCD sensors come with a full fill pixel, that is the whole of the pixel is receptive to incident photons, however the CMOS structure has a structure within the pixel it so has a reduced fill factor. In CMOS structures the receptive area is described as the photodiode and only this area is receptive to the incident light. The CMOS come fitted with microlenses, they are designed to channel the incident photons, which otherwise would have been lost to the built in stucture of the pixel, into the photodiode.

5. What is the read noise in a 13um sCMOS pixel?

We presently do not have a 13um version of the sCMOS, sorry!

6. Are there some collaboration with ISS? Or other experiements in the space?

We presently do not have any active experiments or projects in space.

7. Is it possible to get the Zyla without a cover glass?

Not off the shelf however we have a CSR process which allows bespoke designs to be scoped out and offered on request from customers. If you have an interest in progressing this I would suggest contacting your local sales representative

8. What about fringing in Astronomy?

Hi George I believe we have actually met a long time ago, in Crete I believe, but maybe I am incorrect! In answer to your question yes fringing is an important issue that should always be considered when imaging >780nm. The best solution that we have as camera manufacturers is to apply a coating or roughening to the surface of the sensor to reduce the etaloning which is the source of the visible banding. This can reduce the fringing to <5% of the original and will not effect the performance of the sensor. For this reason we have fringe suppression sensor options for all of our NIR camera options. I would note that other solutions include application of a lumogen layer [acts as a diffusing element) and wedged windows both of which have a more limited effect.

9. Do you have plans for a BI sCMOS soon?

Andor as a company has a very active product development strategy and we have many projects in development.

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