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April 2023 Issue
Feature Articles
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Microscopy’s Cutting Edge
More than two decades after its birth, super-resolution microscopy continues to push the boundaries of what can be revealed with light.
by Meeri Kim![](https://opn-web-afd-d3bfbkd5bcc5asbs.z02.azurefd.net/opn/media/images/articles/2023/0423/features/20230401-p34-foundation-icon1.jpg?t=638452552317620002)
Use Photonics. Find a Solution. Change the World.
The Optica Foundation Challenge enables early-career optics researchers to pursue high-impact ideas.
by Karen Kwon![](https://opn-web-afd-d3bfbkd5bcc5asbs.z02.azurefd.net/opn/media/images/articles/2023/0423/features/20230401-p42-wilk-icon.jpg?t=638452552354653670)
Light as Medicine: Niels Finsen’s Phototherapy
The inventor of the Finsen light made strides in understanding the effects of ultraviolet light in the treatment of disease.
by Stephen R. WilkDepartments and Columns
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Research and Industry News
Distortion-free structured light / Hydrogel purifies water / Flying robot / From batteries to photodetectors / X-ray color imaging / Microscopy & the Nobel / Stacking LED pixels / Industry news
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Microscopy & the Nobel
A look at the five Nobel Prizes awarded in the area of microscopy.
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Growing an Optics and Photonics Economy
Optica’s Tom Hausken writes about what makes a successful economic center.
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Optical Barcoding with Nanolasers
Biomedical researcher Seok Hyun (Andy) Yun will give a plenary talk about tracking and collecting data from individual cells at the upcoming Biophotonics Congress.
![](https://opn-web-afd-d3bfbkd5bcc5asbs.z02.azurefd.net/opn/media/images/articles/2023/0423/departments/20230401-p24-then-now-icon.jpg?t=638452552217448695)
From the Lab to Space
The idea of using sunlight to generate electricity has been around since the 1800s, but solar cells with a practical level of conversion efficiency arrived only in the 1950s.
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Also in this Issue
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The Lure of Big (and Small) Science
Putting science to work toward a better life for all can help build public trust.
![](https://opn-web-afd-d3bfbkd5bcc5asbs.z02.azurefd.net/opn/media/images/articles/2023/0423/departments/20230401-p09-looking-img02.jpg?t=638452552138251444)
30, 20, and 10 Years Ago in OPN
Stamp collecting; optical design of gemstones; optical manipulation
![](https://opn-web-afd-d3bfbkd5bcc5asbs.z02.azurefd.net/opn/media/images/articles/2023/0423/departments/20230401-p50-focus-icon.jpg?t=638452552223564643)
News from the Society
Optica community / Benjamin Franklin Medal / OSK meeting / BOEx prize / Optica Ambassadors / CHIPS Act / Optica Fellow stories / Women in science / Industrial affiliates / Byer named Honorary Member / TIB agreement / UA Industrial Affiliates / Thank you, editors and volunteers
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Thank You, Optica Foundation Donors!
The Optica Foundation recognizes and fosters excellence in the next generation.
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Birefringent Chemical Droplet
A plant-like formation with beautiful patterns and colors spontaneously emerges on the edge of a glass slide when a birefringent chemical droplet is inserted into the space between crossed-polarizers.