Tunable Bragg filters with a phase transition material defect layer

Wang, Xi; Gong, Zilun; Dong, Kaichen; Lou, Shuai; Slack, Jonathan; Anders, André; Yao, Jie

doi:10.1364/oe.24.020365

Cited by 20 publications

(11 citation statements)

References 43 publications

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“…For example, tunable near-IR Bragg filters have been demonstrated by introducing thinfilm VO 2 as a defect layer into an alternating TiO 2 /SiO 2 optical stack by depositing all the layers on a bulk quartz substrate using conventional magnetron sputtering. 41 However, for the LWIR regime, very few transparent materials are convenient substrates for growth of VO 2 42,43 . Here, we demonstrated that a VO 2 film can be introduced into mid-IR-transparent stacks by first synthesizing VO 2 on a thin Si membrane and then depositing additional thin films on both sides.…”

Section: Discussionmentioning

confidence: 99%

Switchable Induced-Transmission Filters Enabled by Vanadium Dioxide

et al. 2021

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An induced-transmission filter (ITF) uses an ultrathin layer of metal positioned at an electricfield node within a dielectric thin-film bandpass filter to select one transmission band while suppressing other transmission bands that would have been present without the metal layer. Here, we introduce a switchable mid-infrared ITF where the metal film can be "switched on and off", enabling the modulation of the filter response from single-band to multiband. The switching is enabled by a deeply subwavelength film of vanadium dioxide (VO 2 ), which undergoes a reversible insulator-to-metal phase transition. We designed and experimentally demonstrated an ITF that can switch between two states: one broad passband across the long-wave infrared (LWIR, 8 -12 µm) and one narrow passband at ~8.8 µm. Our work generalizes the ITF-previously a niche type of bandpass filter-into a new class of tunable devices. Furthermore, our unique fabrication process-which begins with thin-film VO 2 on a suspended membrane-enables the integration of VO 2 into any thin-film assembly that is compatible with physical vapor deposition (PVD) processes, and is thus a new platform for realizing tunable thin-film filters.

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Section: Discussionmentioning

confidence: 99%

Switchable Induced-Transmission Filters Enabled by Vanadium Dioxide

et al. 2021

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“…In the last few years, the filters are much desired for multiplicity applications, specifically in periodic waveguides structure [2]. The introduction of defects into the periodic structure generates localized narrow bands, which can be utilized for the construction of filters with an exceptionally narrow transmission band [3]. In most studies, filters are focused on the photonic band gaps (PBGs) manipulation, i.e., all defects modes are designed to set within PBGs.…”

Section: Introductionmentioning

confidence: 99%

High Quality Factor Microwave Multichannel Filter Based on Multi-Defectives Resonators Inserted in Periodic Star Waveguides Structure

Ben-Ali¹,

Kadmiri²,

Tahri³

et al. 2020

PIER C

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The transmission spectrum of electromagnetic waves through a one-dimensional photonic star waveguides (SWGs) structure is obtained using the Green function method (GFM). The proposed structure is composed of a finite number of periodic cells; each cell contains a segment of length d 1 grafted in its extremity by resonators of length d 2. This periodic system is altercated by insertion of defects resonators located in three different sites which have lengths d 02 , d 04 , and d 06 different from that of the perfect resonators. The properties of such a multi-defects structure are suitable for tunable very narrow band multichannel filter applications in microwave domain. The perfect photonic structure demonstrates large microwave photonic band gaps (PBGs) in which the propagation of electromagnetic waves is prohibited. For the sake of comparison, we first introduce single defect resonators located in one site; this defect creates hence two transmission peaks (defect modes) in the gaps. These induced modes of noticeable transmissions and good quality factors permit our proposed SWGs to behave like a single narrow band channel filter. Several localized modes appear in the band gaps when we introduce three resonators defects of different lengths and located in three different sites. With an appropriate choice of the geometrical parameters d 1 = 1 m, d 2 = 0.5 m, d 02 = d 04 = d 06 = 2 m, our thrice defectives system can create, in the microwave frequencies range, till eight transmission peaks in the gaps when the defects are located in three consecutive sites. These peaks have very high values of transmission rates and important quality factors reaching Q = 610000. Therefore, our proposed system acts as very narrow band multichannel filters for which defects modes shift towards the low frequencies when the defects resonators lengths increase. The results obtained demonstrate the dependence of the defect modes frequencies, transmission coefficient, and the quality factor on the resonators defects lengths, their numbers, and their positions inside the defective structure.

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“…The conductivity of VO 2 increases by several orders of magnitude during the transition. Up to now, research on VO 2 -based devices has involved many aspects, such as optical switch [18]- [20], absorber [21]- [23], and filter [24]- [26]. In 2018, M. Sun et al proposed a photonic switch based on VO 2 material, whose structure is composed of an array of hexagonal nanoholes [27].…”

mentioning

confidence: 99%

State Switching of Terahertz Reflection and Orbital Angular Momentum in Phase Change Metasurfaces

Song

2022

IEEE Photonics J.

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Metasurfaces with dynamically switchable functions have received extensive attention, and are in high demand in various applications. In this work, dynamically switchable metasurfaces are proposed based on phase change material-vanadium dioxide. They consist of vanadium dioxide blocks, silicon dioxide spacer, and gold film. By changing the size of vanadium dioxide block, vanadium dioxide in the metallic state forms a gradient metasurface. A specially arranged gradient metasurface is designed to achieve a 360°phase modulation capability. Normally incident plane wave is reflected to the right side at the angle of 36.9°at 2.5 THz. When vanadium dioxide switches from the metallic state to the insulating state, the switching of anomalous reflection and specular reflection is realized. In addition, when vanadium dioxide is metal, a vortex beam generator is implemented to generate orbital angular momentum beams with l = 1 and l = 2. The number of orbital angular momentum mode can be switched from l = 0 to l = 1 or l = 2 by changing the state of vanadium dioxide. Since the structure of meta-atom is a square block, the design is simple and easy to integrate. At the same time, the switchable function is accurately implemented without side lobe. The proposed design has potential applications in terahertz switching and communication.

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Tunable Bragg filters with a phase transition material defect layer

Cited by 20 publications

References 43 publications

Switchable Induced-Transmission Filters Enabled by Vanadium Dioxide

Switchable Induced-Transmission Filters Enabled by Vanadium Dioxide

High Quality Factor Microwave Multichannel Filter Based on Multi-Defectives Resonators Inserted in Periodic Star Waveguides Structure

State Switching of Terahertz Reflection and Orbital Angular Momentum in Phase Change Metasurfaces

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