Yoon, Jungbae Chung, Jugyeong Jang, Hyunjun Jung, Jinsu Lee, Yuhan Kim, Chulki Myoung, Nojoon Lee, Donghun 2025-05-22T05:30:32Z 2025-05-22T05:30:32Z 2025-05-21 2025-08 2195-1071 https://pubs.kist.re.kr/handle/201004/152454 Magnetic steganography using wide-field quantum microscopy based on diamond nitrogen-vacancy (NV) centers is experimentally demonstrated. The method offers magnetic imaging capable of revealing concealed information otherwise invisible with conventional optical measurements. For a proof-of-principle demonstration of magnetic steganography, micrometer structures designed as pixel arts, barcodes, and QR codes are fabricated using mixtures of magnetic and non-magnetic materials: Ni and Au. Three different imaging modes based on the changes in frequency, linewidth, and contrast of the NV's electron spin resonance are compared and find that the last mode offers the best quality for reconstructing hidden magnetic images. By simultaneous driving of the NV's qutrit states with two independent microwave fields, the imaging time is expedited by a factor of three. This work shows potential applications of quantum magnetic imaging in the field of image steganography. English John Wiley and Sons Inc. Magnetic Steganography Based on Wide-Field Diamond Quantum Microscopy Article 10.1002/adom.202501161 1 Advanced Optical Materials, v.13, no.24 Advanced Optical Materials 13 24 N scie scopus 001486524800001 2-s2.0-105004844989 Materials Science, Multidisciplinary Optics Materials Science Optics Article MAGNETOMETRY steganography wide-field quantum microscopy diamond nitrogen-vacancy center magnetic imaging magnetic sensing