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[[Optical cavity|Resonator]]s are especially useful in photonic logic, since they allow a build-up of energy from [[constructive interference]], thus enhancing optical nonlinear effects.
Other approaches that have been investigated include photonic logic at a [[Nanotechnology|molecular level]], using [[Photoluminescence|photoluminescent]] chemicals. In a demonstration, Witlicki et al. performed logical operations using molecules and [[surface enhanced Raman spectroscopy|SERS]].<ref>{{cite journal | title = Molecular Logic Gates Using Surface-Enhanced Raman-Scattered Light | first9 = Amar H. | last9 = Flood | first8 = Lasse | last8 = Jensen | first7 = Eric W. | last7 = Wong | first6 = Jan O. | last6 = Jeppesen | first5 = Vincent J. | last5 = Bottomley | first4 = Daniel W. | last4 = Silverstein | first3 = Stinne W. | last3 = Hansen | journal = [[J. Am. Chem. Soc.]] | first2 = Carsten | date = 2011 | volume = 133 | issue = 19 | last2 = Johnsen | pages = 7288–91 | doi = 10.1021/ja200992x | pmid = 21510609 | first1 = Edward H. | last1 = Witlicki | bibcode = 2011JAChS.133.7288W | url = https://figshare.com/articles/Molecular_Logic_Gates_Using_Surface_Enhanced_Raman_Scattered_Light/2651761 }}</ref>
==Unconventional approaches==
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* {{cite book |first1=S. |last1=Dolev |first2=M. |last2=Oltean |title=Optical Supercomputing: 4th International Workshop, OSC 2012, in Memory of H. John Caulfield, Bertinoro, Italy, July 19–21, 2012. Revised Selected Papers |url=https://books.google.com/books?id=Sy-7BQAAQBAJ |date=2013 |publisher=Springer |isbn=978-3-642-38250-5}}
* [https://web.archive.org/web/20090913002603/http://www.newscientist.com/article/mg19526136.400-speedoflight-computing-comes-a-step-closer.html Speed-of-light computing comes a step closer] ''New Scientist''
* {{cite journal |author= Caulfield H.|author2= Dolev S.|title= Why future supercomputing requires optics| journal= Nature Photonics| volume=4 |issue= 5|pages=261–263 |date=2010 |doi=10.1038/nphoton.2010.94|bibcode= 2010NaPho...4..261C}}
* {{cite journal |author= Cohen E.|author2= Dolev S.|author3=Rosenblit M.| title= All-optical design for inherently energy-conserving reversible gates and circuits| journal= Nature Communications| volume=7 |pages=11424 |date=2016 |doi=10.1038/ncomms11424 | pmid=27113510 | pmc=4853429|bibcode=2016NatCo...711424C}}
* {{cite book |first1=Yevgeny B.|last1=Karasik |title=Optical Computational Geometry |url=https://www.amazon.com/Optical-Computational-Geometry-computational-constructions-dp-B095MQJ8NJ/dp/B095MQJ8NJ |date=2019 |isbn=979-8511243344}}
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