Dielectric tunability of SrTiO3 thin films in the terahertz range

Kužel, Petr; Kadlec, F.; Němec, H.; Ott, R.; Hollmann, E.; Klein, N.

doi:10.1063/1.2183370

Cited by 73 publications

(49 citation statements)

References 13 publications

(18 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It shows a stable averaged value of 18.52 between 0.2 to 1 THz, which is comparable with reported values [2,16,18]. The permittivity of STO is determined by ionic polarization and its dielectric response is governed by the soft mode phonon at 2.8 THz, which causes the high permittivity of STO in the sub-THz range [5,17].…”

supporting

confidence: 86%

“…Displacive ferroelectrics such as SrTiO 3 (STO) are characterized by the existence of a polar soft lattice vibration mode responsible for the ferroelectric phase transition [5]. The permittivity of STO single crystal in the sub-THz range is reported to be very high [2,5,16,18] and increases with decreasing temperature, while their permittivity at ∼1.5 to 3 THz is negative [5]. Such properties of STO can lead to interesting applications in THz PC and tunable devices [5].…”

mentioning

confidence: 99%

“…Ferroelectrics and paraelectrics with large refractive indices and tunability are good candidates for THz PC devices like filters, beam splitters and polarizers [14][15][16][17][18]. Displacive ferroelectrics such as SrTiO 3 (STO) are characterized by the existence of a polar soft lattice vibration mode responsible for the ferroelectric phase transition [5].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Strontium titanate/silicon-based terahertz photonic crystal multilayer stack

et al. 2011

View full text Add to dashboard Cite

A one-dimensional photonic crystal working in the terahertz (THz) range was designed and implemented. To facilitate the design, the transmission properties of strontium titanate crystals were characterized by THz-time-domain spectroscopy. Relatively high refractive index (∼18.5) and transmission ratio (0.08) were observed between 0.2 to 1 THz. A stacked structure of (Si d Si /STO d STO ) N /Si d Si was then designed, with transmission spectra calculated by the transfer matrix method. The effects of the filling ratio (d STO /(d Si + d STO )), periodicity (d Si + d STO ) and the number of repeats N on the transmission of PC were investigated. The effect of introducing a defect layer was also studied. Based on these, Si/STO multilayers with STO defect thickness of 125 µm and 200 µm were measured. The shift of the defect mode was observed and compared with the calculations.

show abstract

supporting

confidence: 86%

mentioning

confidence: 99%

See 1 more Smart Citation

Strontium titanate/silicon-based terahertz photonic crystal multilayer stack

et al. 2011

View full text Add to dashboard Cite

show abstract

“…13 Such layers show an enhanced tunability of the complex microwave and terahertz dielectric function at room temperature as compared to single crystals and unstrained films. [14][15][16] It has been demonstrated that STO/DSO multilayers can be grown on DSO substrates with the aim to increase the total thickness of the strained STO. 7,16 A strong strain and, as a consequence, high values of the subterahertz dielectric function at room temperature can then be maintained across at least 200 nm of the total thickness of STO layers.…”

Section: Introductionmentioning

confidence: 99%

Temperature and electric field tuning of the ferroelectric soft mode in a strainedSrTiO3/DyScO3heterostructure

et al. 2009

Self Cite

View full text Add to dashboard Cite

We studied THz dielectric spectra of SrTiO 3 / DyScO 3 epitaxial multilayers with four 50-nm-thick layers of each compound deposited on DyScO 3 substrate as a function of temperature and electric field. At room temperature, SrTiO 3 is in the paraelectric phase and, due to the in-plane tensile strain within the films, the soft-mode frequency is shifted down to 47 cm −1 . The ferroelectric phase transition occurs in the strained SrTiO 3 layers around 270 K and in the ferroelectric phase the soft-mode hardening upon temperature decrease is observed. The soft mode is linearly coupled to an excitation of relaxation type at 10 cm −1 at all temperatures. This relaxation is silent in the paraelectric phase, but it becomes coupled to the polarization below the ferroelectric transition temperature and its strength progressively increases. The recently proposed universal model of soft-mode behavior in strained SrTiO 3 films ͓C. Kadlec et al., J. Phys.: Condens. Matter 21, 115902 ͑2009͔͒ was generalized to describe the observed spectra at all temperatures and applied fields.

show abstract

“…Considering the fact that the dielectric constant of ceramics can be regulated by other external stimuli, such as the electric field [39] and the stress field [40], etc., we expect that the temporal response of the proposed active cloak can be much better, though it is beyond the scope of this study.…”

Section: Appendix B: Mechanism Of the Temperature-tunable Cloakmentioning

confidence: 99%

Temperature-Controlled Chameleonlike Cloak

et al. 2017

View full text Add to dashboard Cite

Invisibility cloaking based on transformation optics has brought about unlimited space for reverie. However, the design and fabrication of transformation-optics-based cloaks still remain fairly challenging because of the complicated, even extreme, material prescriptions, including its meticulously engineered anisotropy, inhomogeneity and singularity. And almost all the state-of-the-art cloaking devices work within a narrow and invariable frequency band. Here, we propose a novel mechanism for all-dielectric temperature-controllable cloaks. A prototype device was designed and fabricated with SrTiO 3 ferroelectric cuboids as building blocks, and its cloaking effects were successfully demonstrated, including its frequency-agile invisibility by varying temperature. It revealed that the predesignated cloaking device based on our proposed strategy could be directly scaled in dimensions to operate at different frequency regions, without the necessity for further efforts of redesign. Our work opens the door towards the realization of tunable cloaking devices for various practical applications and provides a simple strategy to readily extend the cloaking band from microwave to terahertz regimes without the need for reconfiguration.

show abstract

Dielectric tunability of SrTiO3 thin films in the terahertz range

Cited by 73 publications

References 13 publications

Strontium titanate/silicon-based terahertz photonic crystal multilayer stack

Strontium titanate/silicon-based terahertz photonic crystal multilayer stack

Temperature and electric field tuning of the ferroelectric soft mode in a strainedSrTiO3/DyScO3heterostructure

Temperature-Controlled Chameleonlike Cloak

Contact Info

Product

Resources

About