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Le nanotecnologie hanno permesso di stabilire un nuovo record. I ricercatori del Politecnico federale di Zurigo (ETH) sono infatti riusciti a realizzare un'immagine a colori larga quanto un capello. I colori della stampa sono estremamente vividi e brillanti, ma possono essere ammirati solo al microscopio.
Le dimensioni lasciano stupiti: con una lunghezza di 115 millesimi di millimetro e un'altezza di 80, l'immagine copre una superficie minuscola, pari a 0,0092 millimetri quadrati, quanto un singolo pixel di un display retina.
La foto, che ritrae tre pesci pagliaccio intorno a un'anemone, può vantare colori particolarmente brillanti grazie alla tecnologia dei cosiddetti punti quantici (Quantum-Dot, Qd): nanocristalli composti da materiali semiconduttori che emettono luce di colori diversi a seconda delle loro dimensioni. I punti quantici possono offrire grande intensità all'immagine e, proprio per questo, hanno recentemente fatto il loro debutto negli schermi piatti di ultima generazione.
ATS/M.Ang.
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