Observation of zeroth-order band gaps in negative-refraction photonic crystal superlattices at near-infrared frequencies.
We present the first observations of zero-n[over ] band gaps in photonic crystal superlattices consisting of alternating stacks of negative-index photonic crystals and positive-index dielectric materials in the near-infrared range. Guided by ab initio three-dimensional numerical simulations, the fabricated nanostructured superlattices demonstrate the presence of zeroth-order gaps in remarkable agreement with theoretical predictions across a range of different superlattice periods and unit cell variations. These volume-averaged zero-index superlattice structures present a new type of photonic band gap, with the potential for complete wave front control for arbitrary phase delay lines and open cavity resonances.
Kocaman
S
S
Columbia University, New York, New York 10027, USA.
Chatterjee
R
R
Panoiu
N C
NC
McMillan
J F
JF
Yu
M B
MB
Osgood
R M
RM
Kwong
D L
DL
Wong
C W
CW