A chip-based microcavity derived from multi-component tellurite glass

Abstract

Construction of a chip-based optical microcavity from multi-component glass has long been a significant fundamental challenge in the cross field of materials science and photonics. Here we introduced a scalable non-hydrolytic sol-gel method for deposition of multi-component glass film with high thickness and superior homogeneity. Prototypically, we demonstrated success in the fabrication of multicomponent tellurite thick film, and construction of the tellurite microcavity on a silicon chip through a combined etching technology for the first time. The collaborative studies by using the steady-state spectrum, whisper gallery mode (WGM) resonance spectrum and electric field distribution firmly indicate that the obtained thick film and microcavity present excellent properties, pointing to their promising applications in integrated photonics.

Glass-on-Glass Fabrication of Bottle-Shaped Tunable Microlasers and their Applications

“…and an absorption cross-section of 1.7×10 20 /cm 2 . The calculated Q abs = 1.2×10 6 and the loaded cavity Q was assumed to be 100 times less than this. To determine ∆T a , the change in temperature for each pump power was determined from the maximum shift and Eq.…”

“…Individual doped glass WGM microlasers can also be made via femtosecond laser micromachining on a bulk sample of doped glass 6 . Simultaneous on-chip fabrication, by lithography and etching, of a large number of active glass resonators is possible by doping the chip before fabrication either with ion implantation 7 or by Solgel coating 8 9 . For passive devices, individual resonators - such as microspheres - can also be activated by coating using the Solgel process 10 11 12 .The on-chip method is obviously more complicated and requires much more equipment than the simple heating methods, but it has the advantage that the coupling between the excitation waveguide and any cavity on the chip can be easily achieved by moving the chip relative to the waveguide.…”

Self‐limited crystallization‐mediated removal of hydroxyl in glass

“…It is important to find that the self‐limited in situ phase‐transition can make a significant impact on the radiative transitions of doped active centers. As a proof‐of‐concept experiment, erbium (Er 3+ ) was selected as probe dopant, because of its fundamental roles in photonics . We investigated the photoluminescence of the Er 3+ ‐doped glass composites heat‐treated at different temperatures and the results are shown in Figure A.…”

“…Another possible contribution is the phonon energy around the dopant, which may affect the electronic transition of active dopant. It has been reported that the low phonon energy of CeF 3 is beneficial for the near‐infrared luminescence of Er 3+ . To examine this factor, glass composites embedded with YF 3 crystalline phase were designed and fabricated by high‐temperature melt‐quenched method because (1) it has similar phonon energy (YF 3 : 500 cm −1 ) with CeF 3 crystalline phase (CeF 3 : 488 cm −1 ) and (2) it can help to avoid the influence of Ce 3+ ‐Er 3+ energy transfer.…”

Mechanistic insight into the non-hydrolytic sol–gel process of tellurite glass films to attain a high transmission

“…29,30 The preparation of TeO 2 -based lms using the conventional hydrolytic sol-gel (HSG) chemistry suffers from the Te-alkoxide precursor readily undergoing detrimental hydrolysis instead of the desired polymerization. 31,32 To circumvent this obstacle, a non-hydrolytic sol-gel (NHSG) chemical route was developed, 29,30 with Na 2 O and ZnO introduced as network modier 30 and network intermediate, 29,33 respectively. Yet hitherto, the NHSG route has not been developed to a procedure that completely prevents the formation of metallic-Te and/or oxide crystals during the preparation of TeO 2 -based sol-gel glass lms.…”