Novel sol-gel material for fabrication of a long period waveguide grating filter as a precise thermometer
Tóm tắt
A new kind of organic-inorganic hybrid HfO2/SiO2 sol-gel material with a large thermo-optic coefficient and a wide linear tunable temperature range has been developed for fabrication of a long period waveguide grating (LPWG) filter, whose parameters were optimized and designed by using finite difference time domain (FDTD) simulations. The LPWG filter, a periodic rectangle-corrugated grating structure, was easily fabricated with soft-lithography technique. At a temperature range from 19°C to 70°C, the fabricated LPWG filter element demonstrated a high temperature sensitivity of about 6.5 nm/°C and a wide linear tunable temperature range of 51°C, so that it can be used as a precise thermometer. Our results are useful for the designs of LPWG filters for the implementation of a wide range of thermo-optic functions.
Tài liệu tham khảo
O’Flaherty F J, Ghassemlooy Z, Mangat P S, et al. Temperature characterisation of long-period gratings for sensor applications. Microw Opt Technol Lett, 2004, 42: 402–405
Chiang K S, Lor K P, Liu Q, et al. Long-period waveguide gratings. Jpn J Appl Phys, 2004, 43: 5690–5696
Lor K P, Liu Q, Chiang K S. UV-written long-period gratings on polymer waveguides. IEEE Photon Technol Lett, 2005, 17: 594–596
Tsoi H C, Wong W H, Pun E Y B. Polymeric long-period waveguide gratings. IEEE Photon Technol Lett, 2003, 15: 721–723
Rastogi V, Chiang K S. Long-period gratings in planar optical waveguides. Appl Opt, 2002, 41: 6351–6355
Christophe M, Bertrand H, Laurent C, et al. Advanced spectral filtering functionalities in ion-exchanged waveguides with artificial cladding gratings. Opt Commun, 2004, 233(1–3): 97–106
Jin W, Chiang K S, Liu Q. Electro-optic long-period waveguide gratings in lithium niobate. Opt Express, 2008, 16: 20409–20417
Tabuchi H, Abe T, Terada K, et al. Long-period-grating-loaded semiconductor separate-confinement heterostructure waveguide for polarization-independent gain-equalizing device. J Appl Phys, 2005, 44(49): L1488–L1490
Kwon M S, Cho Y B, Shin S Y. Experimental demonstration of a long-period grating based on the sampling theorem. Appl Phys Lett, 2006, 88(22): 211103
He M, Yuan X C, Bu J, et al. Hybrid sample-inverted reflow and soft-lithography technique for fabrication of conicoid microlens array. Appl Opt, 2005, 44(19): 4130–4135
He M, Bu J, Ong B H, et al. Two-microlens coupling scheme with revolved-hyperboloid solgel microlens arrays for high-power-efficiency optical coupling. J Lightwave Technol, 2006, 24(7): 2940–2945
Pisignano D, Anni M, Gigli G, et al. Flexible organic distributed feedback structures by soft lithography. Synth Met, 2003, 137: 1057–1058
Horvath R, Lindvold L R, Larsen N B. Fabrication of all-polymer freestanding waveguides. J Micromech Microeng, 2003, 13: 419–424
Kunnavakkam M V, Houlihan F M, Schlax M, et al. Low-cost, low-loss microlens arrays fabricated by soft-lithography replication process. Appl Phys Lett, 2003, 82: 1152–1154
Huang Y Y, Paloczi G, Scheuer J, et al. Soft lithography replication of polymeric microring optical resonators. Opt Express, 2003, 11: 2452–2458
Vengsarkar A M, Pedrazzani J R, Judkins J B, et al. Long-period fiber-grating-based gain equalizer. Opt Lett, 1996, 21: 336–338
Liu Q, Chiang K S, Lor K P, et al. Temperature sensitivity of a longperiod waveguide grating in a channel waveguide. Appl Phys Lett, 2005, 86: 241115
Tang H Y, Wong W H, Pun E Y B. Long period polymer waveguide grating device with positive temperature sensitivity. Appl Phys B, 2004, 79: 95–98