Negative refraction at infrared wavelengths in a two-dimensional photonic crystal.
We report on the first experimental evidence of negative refraction at telecommunication wavelengths by a two-dimensional photonic crystal field. Samples were fabricated by chemically assisted ion beam etching in the InP-based low-index constrast system. Experiments of beam imaging and light collection show light focusing by the photonic crystal field. Finite-difference time-domain simulations confirm that the observed focusing is due to negative refraction in the photonic crystal area.
Department of Microelectronics and Information Technology, Royal Institute of Technology, Electrum 229, S-16440 Kista, Sweden.
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A
Berrier
M
M
Mulot
M
M
Swillo
M
M
Qiu
L
L
Thylén
A
A
Talneau
S
S
Anand