The existing optical cryptosystems always process the plaintexts into a random noise image, and the length of the key in the encryption progress is generally much longer than that of the plaintext. In this work, a Harr-wavelet-based optical cryptosystem using the convex lens is proposed. This scheme only needs recording the amplitude. The encryption key includes a series of parameters which is quite shorter than the length of the plaintext. These keys are natural inherent parameters. The Harr transform is introduced to improve the sensibilities of encryption keys and reduce the length of the ciphertexts. The ciphertext is a diffraction-pattern-like image which contains no information of plaintext. Besides, the cost of the whole optical encryption is reduced heavily. Extensive numerical simulations are carried out to verify the security, feasibility, and sensibilities of encryption keys of the proposed encryption scheme. In addition, how to properly select encryption keys is also discussed.
The photodetectors generally works as the significant unit in intelligent optoelectronic systems, converting optical signal into electrical signal. The photomultiplication (PM) type polymer photodetectors (PPDs) were successfully demonstrated based on sandwich structure of ITO/PEDOT:PSS/PBDB-T:polymer acceptor (mass ratio, 100:3)/Al. The performance of PM type PPDs were enhanced by solvent additive 1-chloronaphthalene (CN). The EQE value of PM type PPDs with CN under -15 volts bias approaches 860% and 600%, and is better than EQE values of 300% and 240% in PM type PPDs without CN under 350 nm and 670 nm light illumination, respectively, which confirms the effectiveness of solvent additives CN on improving the performance of PM type PPDs. The PM phenomenon can be ascribed to the hole tunneling injection assisted by interfacial band bending. This paper provides new insight into realizing excellent performance PM type PPDs.
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