PT  - JOURNAL ARTICLE
AU  - Khorasaninejad, Mohammadreza
AU  - Ambrosio, Antonio
AU  - Kanhaiya, Pritpal
AU  - Capasso, Federico
TI  - Broadband and chiral binary dielectric meta-holograms
AID  - 10.1126/sciadv.1501258
DP  - 2016 May 01
TA  - Science Advances
PG  - e1501258
VI  - 2
IP  - 5
4099  - http://advances.sciencemag.org/content/2/5/e1501258.short
4100  - http://advances.sciencemag.org/content/2/5/e1501258.full
SO  - Sci Adv2016 May 01; 2
AB  - Subwavelength structured surfaces, known as meta-surfaces, hold promise for future compact and optically thin devices with versatile functionalities. By revisiting the concept of detour phase, we demonstrate high-efficiency holograms with broadband and chiral imaging functionalities. In our devices, the apertures of binary holograms are replaced by subwavelength structured microgratings. We achieve broadband operation from the visible to the near infrared and efficiency as high as 75% in the 1.0 to 1.4 μm range by compensating for the inherent dispersion of the detour phase with that of the subwavelength structure. In addition, we demonstrate chiral holograms that project different images depending on the handedness of the reference beam by incorporating a geometric phase. Our devices’ compactness, lightness, and ability to produce images even at large angles have significant potential for important emerging applications such as wearable optics.