Theta Modulation in Optics

Single‐shot, simultaneous incoherent and holographic microscopy

“…In fact, it has been reported in 1999 (Beghuin et al , 1999) for polarization imaging, and has often been used since then, notably for multiplexing holographic signals recorded at multiple wavelengths (Kühn et al , 2007; Mann et al , 2008; Fu et al , 2009) or for multiplexing holograms with different illumination angles in endoscopic applications (Saucedo et al , 2006). Needless to say, this type of multiplexing is, in reality, much older, and is directly inspired from pioneer work in classical holography (Leith & Upatnieks, 1963; Armitage & Lohmann, 1965; Lohmann, 1965). In our work, the difference is that one of the signals is of an incoherent nature, and therefore not modulated, which makes its accurate retrieval more complicated.…”

Image Encoding in Modulated Gratings from 1899 to 1970

“…The modern applications of spatial carriers in photography to image processing, superposition information storage and encoded colour recording on single layers are included as a bibliography [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34].…”

All-Dielectric Meta-Surface for Multispectral Photography by Theta Modulation

“…A more serious obstacle is that splitting the incident light into several parts will quickly reduce the light energy of each spectral band to unacceptable levels. Theta modulation originated from the famous Abbe-Porter experiment and was applied to produce color images from black and white film [4]. Based on the theta modulation technique, optical multiple storage [5], color mixture technology [6], optical logic processing [7], and optical encryption technology [8] are subsequently demonstrated.…”