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Nanotechnology Spotlight – Latest Articles

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Showing Spotlights 1 - 8 of 103 in category Nano-optics, -Photonics (newest first):

 

Few-layer antimonene decorated microfiber improves optical modulation communication with enhanced long-term stability

Researchers have used a few-layer antimonene nanosheet to demonstrate all optical modulation in optical signal processing. To utilize the saturable absorption property of few-layer antimonene, antimonene-decorated microfiber was employed as an optical saturable absorber that can allow for passive mode-locking, Q-switching and all-optical thresholding at the telecommunication band. These results may provide guidance for the application of antimonene and other Group VA mono-elemental 2D materials in ultra-short pulse generation and all optical thresholding with enhanced long term stability.

Posted: Mar 23rd, 2018

Customized design of multiple anti-counterfeiting marks with nanoimprinting

photonic_crystalResearchers report a simple method to facilitate the mass production of flexible photonic crystals (FPCs) with full-color grating properties. The nanoimprinted FPC structure is capable of displaying full-color grating properties because of the nano-hemispherical structures on its surface. This novel approach requires relatively inexpensive equipment and much less time than previous techniques. In addition, multiple anti counterfeiting applications can be easily implemented based on the polymer's intrinsic characteristics.

Posted: Mar 19th, 2018

Black phosphorus analogues: Emerging photoelectric materials

nanosheetsSingle- or few-layer black phosphorus (BP) is one of the most promising two-dimensional semiconductors for electronic and optoelectronic device applications but its environmental instability has always posed a major hurdle for BP-based devices. In contrast, black phosphorus analogues (BPA) nanoarchitectures not only own the similar folded structure of BP, its tunable bandgap energy band and high carrier mobility, but exhibit excellent environmental stability as well. BPA nanosheets can be fabricated by a facile liquid-phase exfoliation method.

Posted: Mar 14th, 2018

A rewritable metacanvas for photonic applications (w/video)

metacanvasThe metacanvas is a completely new generation of technology compared to all previous works. It is a tunable photonic devices based on vanadium dioxide that is lithography-free and fully reconfigurable. oth the patterns and the functionalities of the metacanvas can be arbitrarily reconfigured, which leads to many more degrees of freedom in metasurface design and functionalities. One piece of metacanvas is able to function as different optical components - hologram, phase-array, polarizer, modulator, etc. - at different times and on command, which has never been achieved in any of the previous VO2.

Posted: Feb 7th, 2018

Drastic phase changes in topologically-engineered planar absorbers improve sensitivity of optical sensors

sensorPlasmonic metasurfaces can be designed to achieve the singular-phase condition, yet this typically requires complex electromagnetic design and low-throughput fabrication techniques such as electron beam lithography. In a new work, researchers have developed a simple and robust planar singular-phase sensing platform for remote temperature detection, which does not require nano-patterning and exhibits singular-phase behavior due to the excitation of topologically-protected Tamm surface states.

Posted: Jan 18th, 2018

Manipulating colloids with mobile nanotweezers

helical_nanostructureResearchers have merged two important technologies of nanomanipulation - plasmonic tweezers and magnetically driven microbots - in order to overcome their individual limitations and achieve new functionalities that did not exist before. This technique is applicable to different types of particles in various fluids. The resulting mobile nanotweezers' performance combines the best of both worlds: capturing, maneuvering, and positioning sub micrometer objects of various materials at low illumination intensities, high speeds, and with great control.

Posted: Jan 17th, 2018

Monitor your UV exposure with an adhesive nanoplasmonic patch

sunModerate exposure to sunlight has significant health benefits, however, exposure to ultraviolet (UV) radiation also is a major risk factor for most skin cancers. That means that, while moderate exposure to sunlight is recommended, there is a fine line to walk between beneficial and harmful amounts of UV exposure. To take the guesswork out of assessing the exposure to damaging UV rays, several wearable consumer UV sensors have already hit the market. Researchers have now proposed a simple and low-cost stick-on nanoplasmonic patch made of optically active silver nanoparticles embedded in a film of nanopaper. The patch changes color once it has been exposed to a certain amount of UV light.

Posted: Nov 22nd, 2017

Perovskite-based flexible image sensor array (w/video)

sensorPerovskite materials have attracted great attention in the fields of optoelectronics due to their significant optoelectronic properties. So far, the applications of perovskite thin-films have been limited to solar cells because the required high-definition patterning for optoelectronic devices hadn't been achieved yet. Now, though, researchers in Korea have realized a high-resolution spin-on-patterning (SoP) process for the fabrication of optoelectronic devices arrays such as image sensors.

Posted: Sep 5th, 2017