TY - JOUR
T1 - Degenerate band edges in optical fiber with multiple grating
T2 - Efficient coupling to slow light
AU - Gutman, Nadav
AU - Botten, Lindsay C.
AU - Sukhorukov, Andrey A.
AU - Sterke, C. Martijn De
PY - 2011/8/15
Y1 - 2011/8/15
N2 - Degenerate band edges (DBEs) of a photonic bandgap have the form (ω- ωD)∝k2m for integers m > 1, with ωD the frequency at the band edge. We show theoretically that DBEs lead to efficient coupling into slow-light modes without a transition region, and that the field strength in the slow mode can far exceed that in the incoming medium. A method is proposed to create a DBE of arbitrary ordermby couplingmoptical modes with multiple superimposed gratings. The enhanced coupling near a DBE occurs because of the presence of one or more evanescent modes, which are absent at conventional quadratic band edges. We furthermore show that the coupling can be increased or suppressed by varying the number of excited evanescent waves.
AB - Degenerate band edges (DBEs) of a photonic bandgap have the form (ω- ωD)∝k2m for integers m > 1, with ωD the frequency at the band edge. We show theoretically that DBEs lead to efficient coupling into slow-light modes without a transition region, and that the field strength in the slow mode can far exceed that in the incoming medium. A method is proposed to create a DBE of arbitrary ordermby couplingmoptical modes with multiple superimposed gratings. The enhanced coupling near a DBE occurs because of the presence of one or more evanescent modes, which are absent at conventional quadratic band edges. We furthermore show that the coupling can be increased or suppressed by varying the number of excited evanescent waves.
UR - http://www.scopus.com/inward/record.url?scp=80051779189&partnerID=8YFLogxK
U2 - 10.1364/OL.36.003257
DO - 10.1364/OL.36.003257
M3 - Article
SN - 0146-9592
VL - 36
SP - 3257
EP - 3259
JO - Optics Letters
JF - Optics Letters
IS - 16
ER -