Improved single-random-phase holographic encryption using double-phase method
| Autor: | Jun Wang, Chun Chen, Qiong-Hua Wang, Ke-Ming Chang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Diffraction
Spatial light modulator business.industry Computer science Phase (waves) Holography 02 engineering and technology 021001 nanoscience & nanotechnology Encryption 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics Angular spectrum method Optics law 0103 physical sciences Ciphertext Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology business Fresnel diffraction |
| Zdroj: | Optics Communications. 443:19-25 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2019.03.016 |
| Popis: | An improved single-random-phase holographic encryption (SRPHE) is proposed by using double-phase method and demonstrated by a spatial light modulator (SLM). Different from the conventional SRPHE using Fresnel diffraction and the bidirectional error diffusion method, the proposed SRPHE employees the angular spectrum diffraction and double-phase method to generate a phase-only hologram, and the phase-only hologram is encrypted into ciphertext by multiplying a single random phase mask. When the ciphertext is modulated by the conjugate of the random phase mask and loaded to a SLM, the decrypted image can be achieved successfully. The improved SRPHE has two advantages of better quality of the decrypted image, and lower time-cost of hologram generation, which is compared with the conventional SRPHE. Numerical simulations and optical reconstruction results have been carried out to verify the validity of the proposed SRPHE. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect