Abstract
A photonic switch is an integral part of optical telecommunication systems. A plasmonic bandpass filter integrated with materials exhibiting phase transition can be used as a thermally reconfigurable optical switch. This paper presents the design and demonstration of a broadband photonic switch based on an aluminium nanohole array on quartz utilising the semiconductor-to-metal phase transition of vanadium dioxide. The fabricated switch shows an operating range over 650 nm around the optical communication C, L, and U band with maximum 20%, 23% and 26% transmission difference in switching in the C band, L band, and U band, respectively. The extinction ratio is around 5 dB in the entire operation range. This architecture is a precursor for developing micron-size photonic switches and ultra-compact modulators for thin film photonics.
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Introduction
Photonic switches are devices used in optical communication and computing network that can establish or release the connection of optical signals1. There is a huge demand for ultra-compact photonic switches because of the rapid advancements in the high-data-rate fibre-optic communication systems, and high-speed optical computing systems2,3.
The switching operation in an optical domain can be achieved by opto-mechanism4, acousto-optic5, magneto-optic6, or electro-optic methods7,8,9. Photonic switches, where thermal energy is used for changing electro-optics properties of the switch, are called thermally reconfigurable photonic/optical switches. Thermally reconfigurable optical switches have several advantages such as easy fabrication, structural simplicity and ample choices of a thermo-optic functional materials10. However, thermally reconfigurable photonic switches are bulky and hence integration with state-of-the-art electronics is a challenge.
Plasmonics offers an attractive platform to bridge the size mismatch between optical devices and electronics, and hence enable compact integration of these devices on a single chip11. Surface plasmons (SP) are free electron oscillations propagating at a metal-dielectric interface, accompanied by electromagnetic oscillations12. Enhanced localization of electric field can be achieved by using the plasmonics, and this effect allows for the development of nanoscale-optic devices beyond the diffraction limit13,14,15,16. Nanoscale devices based on plasmonic metamaterials attract keen interest for the development of next-generation optoelectronic devices17,18, including metasurface filters19,20,21,22, metamaterials switches and modulators23.
Plasmonic wavelength filters based on perforated metallic film integrated with suitable materials exhibiting phase transition can be used as a thermally reconfigurable photonic switch operate in submicron scale24,25. One such material is vanadium dioxide (VO2), a canonical Mott material with a large refractive index change from 3.24 + 0.30i to 2.03 + 2.64i at 1550 nm during semiconductor-to-metal (semi-metal) phase transition26. VO2 has been extensively explored in recent years because of its large refractive index change during the phase transition27. The phase transition can be triggered by thermal heating in milliseconds, light irradiation in femtoseconds or external electrical field in picoseconds28,29,30,31. Combining submicron light confinement of plasmonics with large refractive index change of VO2 can be exploited for making novel photonic devices. Recently, versatile applications of plasmonics by utilizing VO2 phase transition have been explored, such as metasurfaces24,32, optical memory device31 nanoscale antenna33, temperature sensor34, rewriteable devices35, and ring modulator36. For electro-optical applications, the precise control of VO2 phase transition is essential37,38. A switchable metasurface based on VO2 working at THz region is recently proposed based on computer simulations which can be switched from broadband absorber to a reflecting brandband halfwave plate by temperature tuning39. VO2 – Ag thermal waveguide switch is experimentally demonstrated with a typical 50% roll-off frequency of 25 kHz in 10 um waveguide length39. The thermal waveguide switch gives an idea of switching time which is around microsecond using thermal trigger for the plasmonic VO2 switch40. Recently, VO2 - Ag and VO2 – Au based thermally-driven optical switches operating near IR region (800 nm to 900 nm) have been demonstrated with 4% and 1.2% transmission respectively using a square arrangement of holes41.
In this manuscript, we present, using both computational and experimental methods, a broadband photonic switch based on a hybrid combination of a hexagonal array of holes and vanadium oxide. The hexagonal arrangement of holes in aluminium is fabricated on a quartz substrate, followed by the deposition of VO2 on the nanohole array. The proposed geometry has several advantages. The fabricated photonic switch is polarization independent due to the hexagonal arrangement of holes. A hexagonal arrangement will also increase the holes per area and increase the efficiency of the device. Aluminium is CMOS compatible and inexpensive compared to gold and silver. A high transmission of 37.5% at optical communication region is achieved in the hole array with an optimized device geometry and a thin layer of VO2 with a thickness of 25 nm atop hole array. The switching of the plasmonic hole array is achieved thermally by changing the refractive index of VO2 that results in a 21% transmission change with 4.3 dB extinction ratio in the C band, 23% transmission change with 5 dB extinction ratio in the L band, and 26.5% transmission change with 5.3 dB extinction ratio in the U band with an operating range over 650 nm. It is for the first time that such a combination of the hexagonal array with semiconductor-to-metal phase transition of VO2 has been explored for the fabrication of a thermally reconfigurable photonic switch, resulting in such high transmission efficiency in the optical communication range.
Device Design and Simulation
Ebbesen reported in 199842 the extraordinary optical transmission in a thin metal film when the hole diameter is under the cutoff of the first propagating mode. The dominant resonant surface plasmon excitation leads to a wavelength selection with 1000 times higher transmission than the prediction of conventional aperture theory43. This extraordinary optical transmission has been observed in noble metal thin films like Ag, Au, Cu, as well in transition metals like Co, Ni, W44, over a wide range of frequencies45,46,47. Ever since, extensive research has been conducted on structures with periodic roughness like nanoparticles, grooves, and arrays using subwavelength holes48. The subwavelength hole arrays in thin metallic film exhibit the character of optical filters with enhanced transmission, which has been widely applied, and the major contributions are focused on biomolecular sensors49, nano-antennas50, plasmonic optical filters51, plasmonic modulators and switches41,52. For the hole array based filters that are operating in transmission mode, resonant peaks in transmission are dominated by the surface plasmon mode excited at the cylindrical hole boundaries and two facets. In a triangular (hexagonal) hole array based plasmonic filter, the transmission peaks can be approximately predicted using the equation (1) given by53
where \(a\) is the pitch of the array, εm and, εd refer to the dielectric constants of metal and dielectric material, and \(\,i,j\) refer to scattering order. The λmax actually is the minimum transmission of wavelength right before the resonance peak at longer wavelength. The scattering orders can be considered to be i = 1, j = 0, if only the first transmission minimum before the peak is considered. Using the above equation, it is possible to optimize the hole array filter to any wavelength of interest. Detailed optimization of the filter to operate at optical telecommunication range was carried out using finite element method implemented in COMSOL Multiphysics. The simulation mesh size has been adjusted according to the maximum computing power available in our lab. The simulation model consists of 100 nm thick layer of aluminium on a semi-infinite glass substrate with the refractive index value, 1.45. The refractive indices of aluminium for different wavelengths were taken from Johnston and Christy54. Top view of a section of simulation model is shown in Fig. 1(a), which shows quartz substrate and 100 nm thick aluminium along with hole geometry (without top layer of VO2). The resonance peak is finely tuned to 1.55 um by varying the pitch of hole array to 1010 nm (P = 1010 nm) and keeping hole diameter (D = 560 nm) and the thickness of aluminium (100 nm) constant. A 10-nm Chromium layer is inserted beneath the Al film as an adhesion layer using transition boundary condition. The refractive indices are taken from Johnston and Christy55. The transition boundary condition is used for simulating ultra-thin layers with thickness hard to be covered by mesh size of the simulation model. A VO2 layer was added on the top of aluminum layer with holes filling the VO2 to make the photonic switch. The thickness of VO2 was varied from between 100 nm and 25 nm (using transition layer/transition boundary condition) to study its effect on transmission and switching. A 500-nm air superstrate is constructed on the top of VO2 (not shown in Fig. 1(a)). To simulate a large hexagonal array, periodic boundary condition was applied on four sides of the model as shown in Fig. 1(a). The incident light was set to propagate along the z-axis (perpendicular to the surface of hole array, x-y plane) with TE polarization using port boundary condition. A 400-nm Perfect match layer (PML) is added to the top boundary and the bottom boundary to absorb the outgoing wave and to ensure that no reflection goes into the interior region. Figure 1(b) shows the schematics of the photonic switch with hole array deposited with VO2 along with an extended metal pad for heating VO2 to change its phase. The Al pad is used for attaching heater for characterizing the transmission and switching of the photonic switch for different temperature values.
Figure 2(a,b) show the simulated transmission spectrum and extinction ratio of the above photonic switch optimized to operate in telecommunication wavelength for both semiconducting and metallic phases of VO2 with different thickness 100 nm, 75 nm, 50 nm and 25 nm. The 2 insets of Fig. 2(a) show electrical field distributions on the cross-section of the device with 25-nm VO2 in semiconductor phase at wavelengths of 1300 nm and 1700 nm respectively. The results show that the device work in the reflection mode with more E-field energy reflected and concentrated on the super-substrate air rather than passing through at 1300 nm, whereas in transmission mode the E-field energy concentrated in the cylindrical waveguide and transmitted through the substrate quartz at 1700 nm. The simulation results are in agreement with detailed mode analysis discussed in the prior art56. The transmission and the extinction obtained in C, L, and U band are given in Table 1. The wavelength was swept from 1300 nm to 2000 nm.
It was found that as the VO2 film thickness decreases, there is an increase in the extinction ratio and transmission. However, practically it is difficult to reduce the thickness of VO2 to less than 25 nm by keeping the uniformity of the film, especially filling on the Al nanoholes without creating patches. Hence there is a trade-off between the feasibility of fabrication and device performance. For the photonic switch, the thickness of VO2 was selected to be 25 nm to increase the transmission efficiency of C, L and U band (example, 3.4% and 39.5% transmission in the metallic and semiconducting phase of VO2 with extinction ratio 10.6 dB at 1675 nm as shown in Fig. 2). The results also show that the switch operates in a broad wavelength range from 1530 nm to 2000 nm with less than 3-dB loss with 25-nm VO2. This ensures that the photonic switch covers the wavelength window used in optical communications. These results also show that the device can act as a switch by changing the phase of VO2 from semiconducting (ON state) to metallic state (OFF state) with the application of heat (68 °C).
Device Fabrication and Characterization
Based on the above simulation results, photonic switches were fabricated on a 500 µm thick quartz substrate using electron beam lithography (EBL) (Vistec EBPG5000plusES). The fabrication steps are shown in Fig. 3 (steps (a)–(f)). In the first step (a), a 350 nm thick double layer of PMMA(Polymethyl methacrylate) was spun on the quartz substrate by Pico Track PCT-150RRE, followed by depositing a 30 nm Cr on the top of PMMA using Electron beam evaporation (EBPVD: Intlvac Nanochrome II) in order to have a conducting surface for EBL patterning. In the second step (b), EBL was used to write the nanohole array pattern on PMMA. Before developing the patterned sample, the conductive layer of Cr was removed by wet etching. This is followed by developing the sample into a mixer of MIBK (Methyl isobutyl ketone) and IPA to make holes in PMMA as shown in step (c). Following this, a 100-nm aluminium thin film was deposited using EBPVD (step (d)) followed by lift off in step (d). Prior to the Al metallization, the substrate was coated with 10 nm Chromium as adhesion layer within the same deposition step. The fabricated hole array is expected to have a hole diameter of 560 nm and pitch of 1010 nm. Extra metallic pad made of aluminium was connected to the hole array for heating the device shown in Fig. 1(b). In the final step (f), VO2 is deposited on top of the aluminium. A quartz substrate is cleaned and plasma treated in an argon environment to enhance adhesion between the VO2 film and the substrate. VO2 is deposited using the pulsed-DC magnetron sputtering technique. A Vanadium (99.99%) target is used in for sputtering. The sputtering chamber is allowed to reach 4.0 × 10−7 Torr before the introduction of the Ar: O2 gas mixture. Ar: O2 mixtures is introduced with a flow rate of 12.25:5.25 sccm respectively (for 30% O2). Sputtering is done at 2.8 × 10−3 Torr pressure, a power of 200 W with 25 kHz pulse frequency and 5 µs reverse time. Deposition is done for 45 minutes at room temperature producing amorphous VO2. Subsequently, the as-deposited VO2 films are annealed in a furnace, evacuated to low vacuum to achieve a pressure of ~250 mTorr, at 550 °C for 90 min. Post-deposition annealing at low pressure enhances the level of control over oxygen vacancies and limits oxygen loss, which happens at a rapid rate in VO2 thin films. X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and micro-Raman spectroscopy were conducted to characterize the VO2 thin films57. The thin films showed good insulator–metal transition, as expected at ~68 °C for the VO2 phase of vanadium oxide57. This allows the formation of excellent VO2 thin films on top of Al nanohole array.
The fabricated photonic switch was characterized using Craic Technologies 20/30 PVTM spectrophotometer and thermal stage as shown in Fig. 4(a). The inset shows SEM image of the hole array in aluminium. As a first step, the nanohole array on aluminium without VO2 was characterized to obtain transmission spectrum with respect to wavelength as shown in Fig. 4(b). The experimentally obtained spectrum (black colour) is superimposed with the simulated spectrum (red colour). The experimentally measured peak wavelength is 1447 nm, which is red shifted by 37 nm compared to the peak value of 1410 nm from simulations. The shift is due to fabrication tolerances including slightly larger hole diameter due to undercutting in walls of holes (average hole diameter between top and the bottom is varied between 540 nm to 590 nm due to nanofabrication and measurement tolerances and hence 570 nm is used in simulations). The maximum transmission from the simulation and experiment were 54% and 47% respectively. After this measurement, a VO2 layer was deposited on the nanohole array to make the photonic switch. The above transmission measurements were repeated for the hole array with VO2 (the photonic switch), and results are discussed in the following section.
After the VO2 deposition, the cross-section of the photonic switch was taken using FIB to study the distribution of VO2 across an area in the sample as shown in Fig. 5(a,b). The SEM images show that VO2 covers the sample almost uniformly except creating small patches with no VO2 in the holes. These patches slightly reduce the extinction ratio of the device due to light leakage in the metallic phase. This can be avoided with increased VO2 thickness at the cost of decreasing transmission percentage. Hence, there exists a trade-off between switching performance and transmission percentage of the device as observed in the simulation results.
In order to find out a suitable temperature range for switching the phase of VO2, a 25 nm VO2 film on the glass substrate was used. The pristine VO2 film was deposited using the same sputtering conditions as the photonic switch. The transmission spectrum of the VO2 film was measured. In order to achieve VO2 phase transition, the VO2 film was heated from room temperature, 294 K (semiconductor phase) to 360 K (metallic phase). Figure 5(c) shows transmission of the VO2 film in semiconducting phase (294 K) and metallic phase (360 K). All transmission measured was normalised with respect to the measured area to obtain absolute transmission. In the semiconductor phase, the transmission increases with respect to wavelength, from 76% to 92%, while in metallic phase the transmission drops from 48% to 36%. This result has shown that there is a large difference of 39% in transmission between semiconductor and metallic phase at 1550 nm wavelength and this property can be exploited for making photonic switches and modulators.
Based on the results obtained by testing only VO2 sample, the temperature was swept for the photonic switch from room temperature 294 K (semiconductor phase) to 360 K (metallic phase). Figure 5(d) shows transmission spectrum of the photonic switch plotted with respect to different temperatures. As the temperature was increased from 294 K, the maximum transmission has decreased from 37.5% to 11.8% due to the phase change of VO2 from semiconductor to a metallic phase. It is also noted that that the peak wavelength of 1725 nm in semiconductor phase (294 K) is slightly blue shifted to 1505 nm when the sample is heated up to metallic phase (360 K). This is due to a low refractive index value of VO2 in metallic phase (real part of refractive index reduced from 3.24 to 2.03). This result is also confirmed by simulation of the photonic switch. Transmission of the switch at 1550 nm with respect to temperature was studied by heating the sample from 294 K to 360 K in step of 5 K followed by cooling the switch along the same temperature range as shown in Fig. 5(e). The results show that there is an optical transmission hysteresis curve during heating and cooling cycles which is consistent with the VO2 material characters29. The fabricated switch has 21% transmission change at C band, 23% transmission change at L band and 26.5% transmission change in U band. The two insets of Fig. 5(e) depicts the simulated electrical field intensity distribution of the photonic switch (VO2/Al nanohole array) in semiconductor phase and metallic phase of VO2 respectively. The electric field is highly confined in the holes due to the large refractive index contrast between the Al and VO2. The maximum transmission peak is 37.5% at 1725 nm (VO2 semiconductor phase) and the transmission reduced to 10.5% during the switching of VO2 phase to metallic (27% transmission difference).
From Fig. 4(b), the experimentally obtained peak wavelength of Al nanohole array alone is 47% at 1447 nm. But the peak wavelength of the photonic switch (after depositing VO2 in the hole array) is red-shifted to 1725 nm. The red-shift is mainly due to the refractive index of VO2 in the nanohole array and fabrication tolerances. Cross-section of a single hole with VO2 was taken using Focused Ion Beam after depositing platinum (Pt) in the hole for better contrast as shown in Fig. 5(b). From the cross-section measurements, the thickness of Al, VO2 and Cr is measured to be 80 nm, 25 nm and 20 nm respectively, and the hole diameter is taken as 570 nm from the average of the top and bottom diameter due to the undercut. These experimentally obtained values are used in the simulation model of the photonic switch to obtain the transmission spectra of VO2 in its semiconductor as well as metallic phase. The simulation results are plotted in Fig. 6(a) and are matching with experimentally measured values. The peak transmission wavelength in semiconductor phase from the simulation is 1735 nm (33.2%) that is close to experimentally obtained the value of 1725 nm (37.5%). From the simulation results, the transmission difference in the photonic switch between the semiconductor and metallic phases of VO2 is 16.5% in C band, 24% in L band and 28% in U band which is also close to experimentally obtained values 21% in C band, 23% in L band and 26.5% in U band. Figure 6(b) shows experimentally measured extinction ratio of the photonic switch for different wavelengths of operation. The extinction ratio is 4.3 dB in C band, 4.9 dB in L band and 5.3 dB in U band. The results also show that the switch operates in a 650 nm wavelength range from 1350 nm to 2000 nm with less than 3-dB loss. There is a small light leakage in the photonic switch as shown in Fig. 6(a) due to missing VO2 film in some holes (Fig. 5(a)) and also due to 25 nm thickness of VO2. The temperature cycling experiment results are provided in supplementary material (S1) with neglected transmission variance. The same heating/cooling process is repeated for each individual measurement and hence the switching effect observed in the device is repeatable.
Conclusion
We have shown for the first time, a photonic switch using vanadium dioxide as switching material with a hexagonal nanohole array structure, with a maximum 37% transmission at optical communication band. The fabricated switch can achieve 21%, 23% and 26.5% transmission difference in switching with extinction ratio 4.3 dB, 4.9 dB and 5.3 dB in C, L, U-band respectively with a wide operating range over 650 nm. The wide operating range, high transmission and compact device footprint (thickness of 125 nm) give us more flexibility and efficiency in integration and application. In the future, we will further explore the other phase change approaches to increase the response speed of switches, such as using external voltage or laser pumping. The results will have potential applications in developing ultra-compact photonic switches, optical modulators in silicon photonics for optical communications.
Data availability
All data used in this manuscript are present in the manuscript and its supplementary information.
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Acknowledgements
RRU and MB acknowledge Australian Research Council support through DP170100363 and DE160100023 respectively. SW acknowledges the support through a Malcolm Moore Foundation Industry Research Award. Thanks Babak Nasr for helping with imaging sample and giving valuable advice for the fabrication. This work was partially performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF). This project was undertaken with the assistance of resources and services from the National Computational Infrastructure (NCI), which is supported by the Australian Government.
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M.S. and R.R.U. conceived the modulator device idea. M.Y.O.T., S.S., S.W. and M.B. conceived the idea of VO2 growth and deposition. M.S. has carried out simulations and nanofabrication. M.T. carried out VO2 deposition. The project was supervised by R.R.U., W.S., M.B., S.S., S.W. Manuscript was prepared by M.S. in discussions with all the co-authors. All the co-authors have contributed to discussions, preparation of manuscript and interpretation of results.
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Sun, M., Taha, M., Walia, S. et al. A Photonic Switch Based on a Hybrid Combination of Metallic Nanoholes and Phase-change Vanadium Dioxide. Sci Rep 8, 11106 (2018). https://doi.org/10.1038/s41598-018-29476-6
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DOI: https://doi.org/10.1038/s41598-018-29476-6
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