Molecule-based photonically switched half-adder

Joakim Andréasson, Gerdenis Kodis, Yuichi Terazono, Paul A. Liddell, Subhajit Bandyopadhyay, Reginald H. Mitchell, Thomas Moore, Ana Moore, Devens Gust

Research output: Contribution to journalArticlepeer-review

166 Scopus citations


A molecule-based binary half-adder with optical inputs and outputs has been demonstrated. The half-adder consists of two photochromic organic molecules in solution and a third-harmonic-generating crystal. One substance acts as an AND Boolean logic gate and the other as an XOR gate. Inputs are laser pulses at 1064 or 532 nm that initiate photoisomerization reactions. Outputs are the optical absorbance of a fullerene radical anion (AND gate) and fluorescence of a porphyrin (XOR gate). The system carries out binary addition based on the laser input pulses. Half-adders in combination are capable of carrying out all mathematical operations necessary for digital computing.

Original languageEnglish (US)
Pages (from-to)15926-15927
Number of pages2
JournalJournal of the American Chemical Society
Issue number49
StatePublished - Dec 15 2004

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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