Giant nonlinear response of terahertz nanoresonators on VO_2 thin film

Kyoung, Jisoo; Seo, Minah; Park, Hyeong‐Ryeol; Koo, Sukmo; Kim, Hyun Sun; Park, Young-Mi; Kim, Bong Jun; Ahn, Kyu-Joong; Park, Namkyoo; Kim, Hyun‐Tak; Kim, Dai Sik

doi:10.1364/oe.18.016452

Cited by 50 publications

(35 citation statements)

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“…A large transient pump-induced increase of the conductivity in the THz frequency range was recently reported by several groups. [29][30][31] Therefore, VO 2 has attracted considerable attention due to potential applications such as ultrafast control of light in VO 2 -based photonic crystals, 32 optical switches, [33][34][35] and optical storage devices. 36 Efficient harvesting of this large technological potential demands a thorough understanding of the microscopic physical processes.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast insulator-metal phase transition in VO2studied by multiterahertz spectroscopy

et al. 2011

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The ultrafast photoinduced insulator-metal transition in VO 2 is studied at different temperatures and excitation fluences using multi-THz probe pulses. The spectrally resolved midinfrared response allows us to trace separately the dynamics of lattice and electronic degrees of freedom with a time resolution of 40 fs. The critical fluence of the optical pump pulse, which drives the system into a long-lived metallic state, is found to increase with decreasing temperature. Under all measurement conditions, we observe a modulation of the eigenfrequencies of the optical phonon modes induced by their anharmonic coupling to the coherent wave-packet motion of V-V dimers at 6.1 THz. Furthermore, we find a weak quadratic coupling of the electronic response to the coherent dimer oscillation resulting in a modulation of the electronic conductivity at twice the frequency of the wave-packet motion. The findings are discussed in the framework of a qualitative model based on an approximation of local photoexcitation of the vanadium dimers from the insulating state.

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Section: Introductionmentioning

confidence: 99%

Ultrafast insulator-metal phase transition in VO2studied by multiterahertz spectroscopy

et al. 2011

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“…In principle, this technique makes it possible to improve absorptive properties [17], and enhance the efficiency of thermo-optically switching the composite [18][19][20]. However, for nanostructures with an LSPR at optical energies, the resonance is significantly damped due to energy losses to the interband transitions of VO 2 , as seen in Fig.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic enhancement of the vanadium dioxide phase transition induced by low-power laser irradiation

et al. 2012

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Nanocomposites consisting of gold nanoparticle (NP) arrays and vanadium dioxide (VO 2 ) thin films are noteworthy for the tunability of both their thermal and optical properties. The localized surface plasmon resonance (LSPR) of the Au can be tuned when its dielectric environment is modulated by the semiconducting-to-metal phase transition (SMT) of the VO 2 ; the LSPR itself can be altered by changing the shape of the NPs and the pitch of the NP array. In principle, then it should be possible to choose a combination of VO 2 film and Au LSPR properties that maximizes the overall optical response of the nanocomposite. To demonstrate this effect, transient transmission measurements were conducted on lithographically fabricated arrays of Au NPs of diameter 140 nm, array spacing 350 nm, and covered with a 60 nm thick films of VO 2 via pulsed laser deposition. Both Au::VO 2 nanocomposites and bare VO 2 film were irradiated with a shuttered 785 nm pump laser, and their optical response was probed at 1550 nm by a fixed-frequency diode laser. The Au::VO 2 nanocomposite exhibited an increased effective absorption coefficient 1.5 times that of the plain film and required 37 % less laser power to induce the SMT. The time-dependent temperature rise in the film as a function of laser intensity was calculated from these measurements and compared with both analytic and finite-element models. Our results suggest that Au::VO 2 nanocomposites

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“…It undergoes an insulator-metal transition (IMT) at critical temperature T c 340 K [6], and its lattice structure changes from insulating phase to metallic phase with its conductivity (unit: S/m) changing 3-5 orders of magnitude induced by thermal [7,8]. This transition can be also induced rapidly by electrical [9] or optical [10][11][12][13] means.…”

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confidence: 99%

State conversion based on terahertz plasmonics with vanadium dioxide coating controlled by optical pumping

Fan

Chen

et al. 2013

Opt. Lett.

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The state conversion and terahertz (THz) wave modulation based on a plasmonic device composed of silicon column arrays with vanadium dioxide (VO2) coating were experimentally demonstrated. For double 45° tilted optical pumping, a state conversion from dielectric photonic crystal (PC) to metallic PC was demonstrated due to the insulator-metal transition (IMT) of VO2 with the pump power increasing. In this process, a broadband intensity modulation with 70% modulation depth was achieved. Furthermore, for normally incident optical pumping, another state conversion from dielectric PC to plasmonic device was also demonstrated due to the partial IMT of VO2, and the out of plane PC resonance gradually changed to be plasmonic resonances. This device and its modulation scheme will be of great significance for potential THz applications.

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Giant nonlinear response of terahertz nanoresonators on VO_2 thin film

Cited by 50 publications

References 51 publications

Ultrafast insulator-metal phase transition in VO2studied by multiterahertz spectroscopy

Ultrafast insulator-metal phase transition in VO2studied by multiterahertz spectroscopy

Plasmonic enhancement of the vanadium dioxide phase transition induced by low-power laser irradiation

State conversion based on terahertz plasmonics with vanadium dioxide coating controlled by optical pumping

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