[1] Birks T A, Knight J C and Russell P J 1997 Opt.
Lett. 22 961

[2] Eggleton B J, Kerbage C, Westbrook P S, Windeler R S and
Hale A 2001 Opt. Express 9 698

[3] Bise R T, Windeler R S, Kranz K S, Kerbage C, Eggleton B
J and Trevor D J 2002 Optical Fiber Communication Conference
and Exhibit (Anaheim, California, USA 17--22 March 2002) p 466

[4] Larsen T, Bjarklev A, Hermann D and Broeng J 2003
Opt. Express 11 2589

[5] Du F, Lu Y and Wu S 2004 Appl. Phys. Lett. 85
2181

[6] Haakestad M W, Alkeskjold T T, Nielsen M D, Scolari L,
Riishede J, Engan H E and Bjarklev A 2005 IEEE Photon. Technol.
Lett. 17 819

[7] Alkeskjold T T, L{\aegsgaard J, Bjarklev A, Hermann D,
Anawati, Broeng J, Li J and Wu S 2004 Opt. Express 12
5857

[8] Du J B, Liu Y G, Wang Z, Liu Z Y, Zou B, Jin L, Liu B, Kai
G Y and Dong X Y 2008 Opt. Express 16 4263

[9] Abramov A A, Eggleton B J, Rogers J A, Espindola R P, Hale
A, Windeler R S and Strasser T A 1999 IEEE Photon.Technol.
Lett. 11 445

[10] Westbrook P S, Eggleton B J, Windeler R S, Hale A,
Strasser T A and Burdge G L 2000 IEEE Photon. Technol. Lett.
12 495

[11] Scolari L, Tartarini G, Borelli E, Alkeskjold T T, Hansen
Mulvad H C, Bassi P and Bjarklev A 2007 LEOS (Lake Buena
Vista, Florida, USA 21--25 October 2007) p 319

[12] Steinvurzel P, Eggleton B J, Sterke C M and Steel M J
2005 Electron. Lett. 41 463

[13] Johnson S G and Joannopoulos J D 2001 Opt. Express
8 173

[14] White T P, McPhedran R C, Sterke C M, Litchinitser N M
and Eggleton B J 2002 Opt. Lett. 27 1977