November 2020 Issue
Feature Articles
Detecting Microplastics with Optics
Emerging optical techniques for sniffing out millimeter- to sub-micron-scale plastics in aquatic settings could aid in the fight against a looming environmental threat.
by Kai-Erik Peiponen, Benjamin O. Asamoah, Boniphace Kanyathare, Jukka Räty and Matthieu RousseyPerovskite Photovoltaics: The Road Ahead
In terms of efficiency, perovskite solar cells are the fastest-growing solar technology to date, but stability issues still block their widespread commercialization.
by Meeri KimDepartments and Columns
Squeezed Light and New Horizons
OPN talks with Nergis Mavalvala, whose FIO+LS plenary talk recounted amazing recent improvements to the LIGO and Virgo gravitational-wave observatories.
Entangled Photons in a CubeSat
Putting compact quantum science into space could support a next-gen internet.
Also in this Issue
30, 20, and 10 Years Ago in OPN
Visualizing flexible networks; adaptive optics and laser eye surgery; optofluidics.
Award winners, Fellows honored at FiO / OSA Fellow stories / Chang named 2020 Honorary Member / Fantone at JSAP / OSA 2021 election results / Student Leadership Conference / OSA Treasurer’s Award / Diversity and inclusion achievements / Remembering Arthur Ashkin / Thanks, editors and volunteers

![Manual probe system with needles for test of semiconductor on silicon wafer. [A. Morozov / Getty]](https://opnmedia.blob.core.windows.net/$web/opn/media/images/articles/2025/1125/departments/202511-cover-web.jpg?ext=.jpg)
![Researcher Clara Saraceno in the lab. [Image by Carsten Behler Photography]](https://opnmedia.blob.core.windows.net/$web/opn/media/images/articles/2025/1025/departments/202510-cover-web.jpg?ext=.jpg)