Surface plasmon on topological insulator/dielectric interface enhanced ZnO ultraviolet photoluminescence

Liao, Zhi-Min; Han, Binghong; Wu, Han; Yashina, Lada V.; Yan, Yuan; Zhou, Yang-Bo; Bie, Ya‐Qing; Божко, С. И.; Fleischer, K.; Shvets, I. V.; Zhao, Qing; Yu, Dapeng

doi:10.1063/1.3703320

Cited by 12 publications

(11 citation statements)

References 21 publications

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“…The few layers of Bi 2 Te 3 are mechanically exfoliated from the bulk single crystal using the standard scotch – tape method 20 – 22 and hence, their thickness is considerably reduced to few QLs in comparison to the bulk Bi 2 Te 3 single crystal where efficient photon emission is possible without the major peak shift like other 2D materials. In our investigated systems (Bi 2 Te 3 ), we expostulate and understand the enhancement in PL emission is due to the higher photon emission into the thin flake of Bi 2 Te 3 via Fӧrster mechanism.…”

Section: Resultsmentioning

confidence: 99%

Unexplored photoluminescence from bulk and mechanically exfoliated few layers of Bi2Te3

Sultana

Singh

et al. 2018

Sci Rep

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We report the exotic photoluminescence (PL) behaviour of 3D topological insulator Bi2Te3 single crystals grown by customized self-flux method and mechanically exfoliated few layers (18 ± 2 nm)/thin flakes obtained by standard scotch tape method from as grown Bi2Te3 crystals. The experimental PL studies on bulk single crystal and mechanically exfoliated few layers of Bi2Te3 evidenced a broad red emission in the visible region from 600–690 nm upon 375 nm excitation wavelength corresponding to optical band gap of 2 eV. These findings are in good agreement with our theoretical results obtained using the ab initio density functional theory framework. Interestingly, the observed optical band gap is several times larger than the known electronic band gap of ~0.15 eV. The experimentally observed 2 eV optical band gap in the visible region for bulk as well as for mechanically exfoliated few layers Bi2Te3 single crystals clearly rules out the quantum confinement effects in the investigated samples which are well known in the 2D systems like MoS2,WS2, WSe2, and MoSe2 for 1–3 layers.

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Section: Resultsmentioning

confidence: 99%

Unexplored photoluminescence from bulk and mechanically exfoliated few layers of Bi2Te3

Sultana

Singh

et al. 2018

Sci Rep

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“…Similarly, Ref. [195] presents evidence in favour of plasmonic enhancement of photoluminescence in ZnO structures using a topological insulator flake from the same family (Bi 2 Te 3 ). These are intriguing results and warrant significantly more research into these materials.…”

Section: Emerging Materialsmentioning

confidence: 93%

“…Of more immediate interest, the family of bismuth based topological insulator compounds have been studied and shown to possess strong plasmonic responses in the ultra-violet spectrum [195,196], far beyond the generally expected terahertz regime for such materials [197]. This could potentially bridge a critical gap in the general functionality of nanophotonic devices: most plasmonic materials, ranging from noble metals to transition metal oxides and graphene, have their responses centered in the visible to IR spectral regime (Fig.…”

Section: Emerging Materialsmentioning

confidence: 99%

“…10b. Consider the subwavelength sized spherical 'byte' comprised of 3 layers made of the two bits ϵ [196]: SEM image and measured spectrum of a patterned Bi [195]: SEM image of a Bi 2 Te 3 film on a ZnO substrate, which exhibits photoluminescence near the bandgap energy in the UV spectrum. The boxed are indicates the region where the photoluminescence measurements are collected.…”

Section: 'Digital' Materials Building Blocksmentioning

confidence: 99%

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Traditional and emerging materials for optical metasurfaces

et al. 2017

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Abstract:One of the most promising and vibrant research areas in nanotechnology has been the field of metasurfaces. These are two dimensional representations of metaatoms, or artificial interfaces designed to possess specialized electromagnetic properties which do not occur in nature, for specific applications. In this article, we present a brief review of metasurfaces from a materials perspective, and examine how the choice of different materials impact functionalities ranging from operating bandwidth to efficiencies. We place particular emphasis on emerging and non-traditional materials for metasurfaces such as high index dielectrics, topological insulators and digital metamaterials, and the potentially transformative role they could play in shaping further advances in the field. General Introduction to optical metasurfacesUnexpected and unusual effects have been recently reported in various fields of research, such as but not limited to acoustics, seismology, thermal physics, and electromagnetism. At the heart of these developments is a progres- sive understanding of the wave-matter interaction and our ability to artificially manipulate it, particularly at small length scales. This has in turn been largely driven by the discovery and engineering of materials at extreme limit. These "metamaterials" possess exotic properties that go beyond conventional or naturally occurring materials. Encompassing many new research directions, the field of metamaterials is rapidly expanding, and therefore, writing a complete review on this subject is a formidable task; here instead, we present a comprehensive review in which we discuss the progress and the emerging materials for metasurfaces, i.e. artificially designed ultrathin two dimensional optical metamaterials with customizable functionalities to produce designer outputs. Metasurfaces are often considered as the two dimensional versions of 3D metamaterials. The former, also known as frequency selective surfaces, or reflectand transmit-arrays in the microwave community [1-6], which has been recently shown to produce a variety of spectacular optical effects ranging from negative refraction [7], super/hyper-lensing [8][9][10], optical mirages to cloaking [11][12][13][14][15][16][17][18][19], are comprised of artificial materials engineered at the subwavelength scale to guide light along any arbitrary direction. The functionalities of individual optical components, which were previously essentially determined by the optical properties of materials, can now be specified at will. Effective material optical parameters can be rigorously derived via homogenization techniques by averaging the electromagnetic fields over a subwavelength volume encompassing each individual element of the periodic ensemble of resonant inclusions, with arbitrary geometry [12,[15][16][17][18][19]. Thus although metamaterials can be tailored for exotic optical functions, the basic mechanism responsible for shaping the optical wavefronts remains the same as that in conventional refractive optics: it is b...

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“…[23] Encouraged by our PL results, we conducted a thickness-dependent study to optimize the PL response with reference to the number of QLs (Figure 6b). [56] Additionally, the formation of a single Dirac cone by the surface states is likely to cause a tunable surface bandgap in topological insulator Bi 2 Te 3 because of its strong dependence upon spin-orbit coupling. [42] For single and two QL flakes, no substantial response was observed because of their high sensitivity and instability toward incident lasers and has been reported elsewhere.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

Ultrahigh Room‐Temperature Photoluminescence from Few to Single Quintuple Layer Bi₂Te₃ Nanosheets

Hussain

Zhang

Lang

et al. 2018

Advanced Optical Materials

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photoluminescence is considered as one of the primary figures of merit for a 2D semiconductor to be a promising material for nano-optoelectronic, [10,11] sensing, [12,13] and photodetector applications. [14,15] Therefore, it remains challenging to achieve substantial room-temperature photoluminescence response from Bi 2 Te 3 nanocrystals. Additionally, surface plasmon resonance (SPR) defines collective oscillations of conduction electrons and has been attracting highly devoted research interest owing to its promising applications in on-chip subwavelength electro-optical devices, [16][17][18] sensing, [19,20] and energy harvesting. [15,[20][21][22] Due to limited plasmonic materials and modulation methods, effective control over the energy modes and intensities of surface plasmon resonances in the visible region remains challenging.The effective mass approximation (EMA) model describes the opening of bandgaps in ultrathin nanostructures, due to quantum confinement effects. [23] Therefore, dimensionally restricted 2D nanocrystals of Bi 2 Te 3 might provide an opportunity to achieve remarkably enhanced PL properties through the bandgap opening/transition and potentially hold SPR. In recent past, 2D nanocrystals of Bi 2 Te 3 have been reported to support surface plasmons and exhibit PL responses. For instance, visible SPR from 2D Bi 2 Te 3 nanoplates by cathodoluminescence [24] and tunablity of visible SPR modes by Se doping in Bi 2 Te 3 [25] have been demonstrated using PL spectroscopy. Meanwhile, PL spectroscopy, in particular, offers a great opportunity to study quantum confinement-induced exciting phenomena originating from light-matter interactions at the nanoscale. The size-dependent characteristics and physical Owing to its narrow indirect bandgap, bulk bismuth telluride (Bi 2 Te 3 ) exhibits exceptionally low room-temperature photoluminescence (PL). Consequently, it remains challenging to achieve promising optical and optoelectronic performance from Bi 2 Te 3 . Moreover, due to the lack of plasmonic materials and available modulation methods, it is challenging to effectively control the surface plasmon resonance intensities in the visible region. Herein, thickness-dependent photoluminescence studies unveil ultrahigh (282-fold) room-temperature photoluminescence (visible) from 20 quintuple layer Bi 2 Te 3 nanosheets (NSs) compared to 200 quintuple layer NSs, attributable to a significant bandgap opening. Intriguingly, considerable photoluminescence quenching is observed beyond the thickness of 20 quintuple layer Bi 2 Te 3 . The PL emission is further optimized with reference to the number of quintuple layers, and the mechanism possibly responsible for such PL behavior is elucidated. Moreover, the thickness modulation is put forward as an effective strategy to control visible surface plasmon resonance energy modes and their intensities. Bi 2 Te 3 nanosheets with large area and high crystallinity are fabricated on various silicon substrates by a facile hot-pressing strategy, which facilitates investigation of in...

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Surface plasmon on topological insulator/dielectric interface enhanced ZnO ultraviolet photoluminescence

Cited by 12 publications

References 21 publications

Unexplored photoluminescence from bulk and mechanically exfoliated few layers of Bi2Te3

Unexplored photoluminescence from bulk and mechanically exfoliated few layers of Bi2Te3

Traditional and emerging materials for optical metasurfaces

Ultrahigh Room‐Temperature Photoluminescence from Few to Single Quintuple Layer Bi₂Te₃ Nanosheets

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Surface plasmon on topological insulator/dielectric interface enhanced ZnO ultraviolet photoluminescence

Cited by 12 publications

References 21 publications

Unexplored photoluminescence from bulk and mechanically exfoliated few layers of Bi2Te3

Unexplored photoluminescence from bulk and mechanically exfoliated few layers of Bi2Te3

Traditional and emerging materials for optical metasurfaces

Ultrahigh Room‐Temperature Photoluminescence from Few to Single Quintuple Layer Bi2Te3 Nanosheets

Contact Info

Product

Resources

About

Ultrahigh Room‐Temperature Photoluminescence from Few to Single Quintuple Layer Bi₂Te₃ Nanosheets