A Large‐Scale Flexible Plasmonic Nanorod Array with Multifunction of Strong Photoluminescence Emission and Radiation Enhancement

Abstract

COMMUNICATIONamong those success stories. [27][28][29][30] Nevertheless, most plasmonic devices are passive ones, where the plasmonic material functions as a component that is designed to "enhance" the optical processes. [31][32][33][34][35][36] There have been few reports on active fl exible plasmonic devices because of their complicated fabrication procedures. On the other hand, the rapid development of quantum optics and integrated optoelectronics renders the development of active fl exible devices inevitable, including active-matrix light-emitters, active optical links, [ 13,37,38 ] and especially plasmonic light sources that can play an imperative role in nanolasers. [39][40][41] In this regard, effective strategies to fabricate active fl exible plasmonic devices are strongly needed for the future development of nano-optical devices.In order to address this problem, we propose herein a facile method to prepare fl exible, plasmonic, gold nanorod arrays with strong multiphoton avalanche photoluminescence (MAPL), combining the advantages of a thin anodic alumina oxide (AAO) template and polydimethylsiloxane (PDMS). The ordered gold nanorod arrays with a length of 105-160 nm and a diameter of 25 nm were grown on a very thin AAO template (ca. 1 µm) by electrochemical deposition, then immersed into the PDMS solution and fi nally subjected to thermal treatment to form a soft gold nanorod array/PDMS (GNA/PDMS) composite fi lm (see Experimental Section). Because of the inherent fl exibility of the solidifi ed PDMS and the thin AAO template (ca. 1 µm) the obtained GNA/PDMS fi lms also exhibit great fl exibility. Furthermore, owing to the strong plasmon interaction with adjacent nanorods in the Au array, these GNA/PDMS samples present outstanding MAPL characteristics, showing an avalanche slope as high as 14 and a threshold as low as 2.1 kW cm −2 (the lowest ever reported), which makes them very favorable for fabricating active fl exible light sources. In addition, the PDMS-embedded Au nanorod arrays can also greatly enhance the photoluminescence (PL) of quantum dots (QDs) around them by accelerating the QD emission rate via surfaceplasmon enhanced electric-fi eld emission. It is strongly believed that our fi ndings can provide a new avenue for the fabrication of novel fl exible plasmonic materials, which will be widely used in future photonic and optoelectronic devices.Figure 1 a is a top-view scanning electron microscopy (SEM) image of the used AAO template (the inset is 45° tilted). The uniform pore size and well-ordered array structure can clearly be seen. The average estimated pore diameter and lattice constant of the template were measured to be 25 and 110 nm, respectively. In order to further study the details of the AAO template as well as the implanted Au nanorods, a cross-sectional SEM Because of their considerable contribution to various optical applications, devices based on plasmonic materials have gained a high reputation in the research of nano-optics. [1][2][3][4][5][6] These devices can sustain collect...

Up-Conversion Perovskite Nanolaser with Single Mode and Low Threshold

“…From this picture, one can see a narrow emission line with the full-width at half-maximum (fwhm) of 17 nm. Furthermore, with the increasing excitation power, the emission behaviors of all the three samples follow quadratic dependences with slopes ν (ν = log I PL /log I exc ) of ∼2.05, strongly suggesting the TPP PL process (Figure d). , …”

“…Furthermore, with the increasing excitation power, the emission behaviors of all the three samples follow quadratic dependences with slopes ν (ν = log I PL /log I exc ) of ∼2.05, strongly suggesting the TPP PL process (Figure 2d). 40,41 Following the optical measurements at room temperature, we turned to study the TPP lasing of a single perovskite (CsPbBr 2 Cl) NC at 77 K. To locate one single NC, we carefully compared the SEM image and the optical image obtained by our EMCCD, and from the pattern features of these pictures, we can locate the perovskite NC which the incident laser is focused on (the diameter of focusing area is within 2 μm, and experimental details can be found in Figure S1). Figure 3a shows the TPP emission spectra recorded from a single CsPbBr 2 Cl nanoplate (edge length is ∼500 nm) with pumping wavelength of 780 nm under different exciting powers.…”

Soft Plasmonics: Design, Fabrication, Characterization, and Applications

“…The capability to sustain collective electron oscillations at the metasurface and modulate the electromagnetic fields at the nanoscale allows a wide range of applications of the soft plasmonic materials for flexible photonic/electronic devices including flexible photoluminescence, [ 126 ] fluorescence‐based immunoassays, [ 127 ] plasmonic lasers, [ 79 ] tunable zoom lenses, [ 39 ] color switching, [ 23,91 ] photoimaging devices, [ 128 ] photocontrolled smart switches, [ 24 ] and modulators. [ 22 ] Figure a shows a stretchable optical zoom lens obtained by depositing an AuNR array on a PDMS substrate.…”

Surface plasmon-enhanced third-order optical non-linearity of silver triangular nanoplate

“…Since the optical non-linearities of materials are superlinearly dependent on the electromagnetic field (6), many strategies are proposed to fabricate nanostructures with the ability to sustain large electric field enhancements so as to obtain effective non-linear optical response, such as photonic crystals, artificial nanocavities and periodic nanoarrays (7)(8)(9)(10)(11). Among all the approaches, the plasmonic materials, which inherit the remarkable virtues of squeezing electromagnetic field into nanoscale and generating extremely enhanced electric fields around their surface, distinguish themselves as promising candidates for non-linear optics and numerous noticeable achievements have been gained due to the helpful participation of plasmonic nanostructures (12)(13)(14)(15)(16).…”