https://www.aanda.org/articles/aa/full_html/2010/16/aa14934-10/aa14934-10.html
Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics
new conceptphase shifterachromaticchessboard
https://www.nist.gov/patents/integrated-optical-phase-shifter-using-buried-electrodes
Efficiently incorporating thermo-optic phase shifters into air-clad integrated photonics.
phase shifterintegratedopticalusingburied