Tunable integrated optical filter made of a glass ion-exchanged waveguide and an electro-optic composite holographic grating.
We report the fabrication and the optical characterization of a hybrid tunable integrated optical filter. It consists of a diffused ion-exchanged channel waveguide on a borosilicate glass substrate with a cover of the same glass to form a gap filled with a holographic grating. The grating morphology, called POLICRYPS (POlymer LIquid CRYstal Polymer Slices), is made of alternating stripes of polymer and liquid crystal acting as overlayer for the underneath waveguide. The filter structure includes aluminum coplanar electrodes to electrically control the grating properties, allowing the tunability of the filter. The electric driving power required to tune the filter obtained was in the range of submilliwatts due to the efficient liquid crystal electro-optic effect.
d'Alessandro
Antonio
A
Dipartimento di Ingegneria Elettronica, Sapienza Università di Roma, Via Eudossiana 18, 00184 Rome, Italy. antonio.dalessandro@uniroma1.it
Donisi
Domenico
D
De Sio
Luciano
L
Beccherelli
Romeo
R
Asquini
Rita
R
Caputo
Roberto
R
Umeton
Cesare
C
D003198:Computer Simulation; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005374:Filtration / Q000295:instrumentation*; D005898:Glass / Q000737:chemistry*; D006696:Holography / Q000295:instrumentation*; D007477:Ions; D008027:Light; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation
D007477:Ions