*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

Hi all,
one of the limitations I can see is the efficiency of these lenses (it's 
something else than the Strehl ratio in this kind of lens). You can look it 
up in the supplementary materials of the relevant papers. It's up to about 
50 % for the monochromatic designs and less than 20 % for the achromatic 
designs...
Best, zdenek
-- 
Zdenek Svindrych, Ph.D.
Research Associate - Imaging Specialist
Department of Biochemistry and Cell Biology
Geisel School of Medicine at Dartmouth
email: [log in to unmask]

---------- Původní e-mail ----------
Od: Kilgore, Jason A. <[log in to unmask]>
Komu: [log in to unmask]
Datum: 2. 1. 2018 13:24:38
Předmět: Application for new metalens from Harvard? 
"***** 
To join, leave or search the confocal microscopy listserv, go to: 
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy 
Post images on http://www.imgur.com and include the link in your posting. 
***** 


I'm curious what the listserve thinks of the news out today from Harvard 
about a new "metalens" that "can focus the entire visible spectrum of light 
- including white light - in the same spot and in high resolution. This has 
only ever been achieved in conventional lenses by stacking multiple lenses."


The announcement bills it for use with virtual imaging and augmented reality
type devices, but I'm curious about its uses for microscopy. 

Link to the announcement: https://www.seas.harvard.edu/news/2018/01/single-
metalens-focuses-all-colors-of-rainbow-in-one-point 

From the announcement: 
'One of the biggest challenges in designing an achromatic broadband lens is 
making sure that the outgoing wavelengths from all the different points of 
the metalens arrive at the focal point at the same time," said Wei Ting 
Chen, a postdoctoral fellow at SEAS and first author of the paper. "By 
combining two nanofins into one element, we can tune the speed of light in 
the nanostructured material, to ensure that all wavelengths in the visible 
are focused in the same spot, using a single metalens. This dramatically 
reduces thickness and design complexity compared to composite standard 
achromatic lenses."' 

I'm picturing a system with an LED excitation that is tuneable for different
wavelengths without chromatic aberration. Thoughts? 

Jason 

** I have no affiliation with Harvard or this innovation ** 

Jason A. Kilgore 
Technical Application Scientist 
Molecular Probes / EVOS Tech Support 
Life Sciences Solutions 

Thermo Fisher Scientific 
29851 Willow Creek Rd. 
Eugene, OR 97402-9132 
1-800-955-6288 then option 4, then option 3, then option 2. 
Or dial direct at +1 541 335 0353 
[log in to unmask]<mailto:[log in to unmask]> 
www.thermofisher.com<http://www.thermofisher.com/> 
"