Along with the rapid development of information technology such as cloud computing, Internet of Things and artificial intelligence etc., huge amount of data is growing at an explosive rate. Conventional optical data storage (ODS) is a promising candidate for massive data storage. It is a sustainable and green technology with the advantages of low energy consumption, high data capacity and long life-time, which once had a high expectation in the data storage market. However, limited storage capacity is one of the main factors which prevents ODS from becoming a favorable competitor against hard disk drive (HDD), flash memory or magnetic tape. Unfortunately, the storage capacity of ODS is constrained by the optical diffraction limit. Although previously reported photoresists allow nanoscale lithography, they can hardly be used in nanoscale optical storage due to a functional deficiency of superresolution readout of the luminescent signal of the written structure. Herein, we endow photopolymerization nanolithography with AIE fluorescence characteristics, which does not destroy the existing nano-writing mechanism2. We demonstrate nanoscale optical memory based on a photoresist film. And our nanoscale optical memory has the potential to hold as much data as a large petabyte-level HDD library.
Different from the quenching effect of conventional dyes, aggregation-induced emission (AIE) dyes radiate fluorescence with the increase of aggregation state, which is a new application in optical storage. In order to increasing the fluorescence contrast of information recording point, a higher writing beam is required. It means that the fluorescence contrast of information point is not excellent at low writing laser power, which undoubtedly improves the bit error rate of information readout. To circumvent the above problem, we doped Mg2 + ions in tetrastyrene (TPE) resin and found that its fluorescence intensity was enhanced. Under this feature, we use the same writing power and find that the fluorescence contrast of its information is also significantly enhanced. Our results provide a way to realize super-resolution recording for AIE optical storage, and to explore the use of AIE dye doped photopolymers chemical sensors.
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