Abstract It is shown that narrowband one‐dimensional photonic crystals can be fabricated from polymeric materials using laboratory scale layer‐multiplying coextrusion technology. The tuning of the bandgap demonstrated with films selectively filter different regions visible electromagnetic spectrum. layer uniformity evaluated by comparing measured UV‐vis transmission spectra model simulations, and independently confirmed atomic force microscopy. Assemblies alternating polystyrene poly(methyl...

Transformers have achieved great success in effectively processing sequential data such as text. Their architecture consisting of several attention and feedforward blocks can model relations between elements a sequence parallel manner, which makes them very efficient to train effective modeling. Even though they shown strong performance data, the size their parameters is considerably larger when compared other architectures RNN CNN based models. Therefore, approaches explored parameter...

We have assembled and studied melt-processed all-polymer lasers comprising distributed Bragg reflectors that were fabricated in large sheets using a co-extrusion process define the cavities for dye-doped compression-molded polymer gain core sheets. Distributed reflector (DBR) resonators consisting of 128 alternating poly(styrene) (PS) poly(methyl methacrylate) (PMMA) layers produced by multilayer co-extrusion. Gain media compression-molding thermoplastic host poly notmers doped with organic...

Novel processing techniques for low-cost production of photonic devices could open up new applications functional polymer systems. To this end, we have used multilayer coextrusion in a continuous melt process to fabricate large-area polymeric nanolayer films optically-pumped all-polymer distributed feedback (DFB) surface-emitting lasers. Each laser film consists hundreds alternating layers two transparent polymers with different refractive indices, which one contains dye. The resulting DFB...

We report on improved gain and spectral control in co-extruded all-polymer multilayer distributed feedback (DFB) lasers achieved by folding deliberate modification of the center "defect" layer. Because DFB laser is greater at defects inside reflection band than edges, manipulation structural can be used to alter thereby tune output wavelength improve efficiency. By experimentally terracing layer that becomes fold, we tuned lasing across stop-band (∼25 nm) controllable, discrete steps. The...

We investigate the temperature dependence of emission wavelength and reflection band polymer Distributed Bragg Reflector (DBR) defect FeedBack (DFB) lasers fabricated using a coextrusion melt-process. show measured spectral shifts are direct consequence optical path modifications associated with layer expansion thermo-optic coefficients. By varying choice bilayers sandwiching DBR laser films between glass coverslips, we that either readily tunable up to 0.36nm/°C or made thermally stable at...

We present a novel select gate (SG) lateral coupling embedded nonvolatile memory without any additional steps on 90-nm high-voltage CMOS process. Usually, the SG devices use complex double poly However, continuing technology shrinkage makes method possible for single The of cell is designed to function as control and an at same time, using only capacitance coupling. Because this distinct structure operating principle, has relatively small size, over-erase free, multitime programmable...

We have investigated the formation of in-bandgap delocalized modes due to random lattice disorder as determined from longitudinal mode spacing in a distributed Bragg laser. were able measure penetration depth, and transfer matrix simulations, determine how localization length is altered for disordered lattices. Transfer simulations studies ensemble average connect gap localized outside expected consideration Anderson localization, well identify controlling parameters.

Polymers are receiving considerable attention as components in novel optical systems because of the tailored functionality, ease manufacturing, and relatively low cost. The processing layered polymeric by coextrusion is a method to produce films comprising hundreds thousands alternating layers single, one-step roll-to-roll process. Several polymer have been fabricated coextrusion, including gradient refractive index lenses, tunable elastomers, photonic crystals, mechanically crystals....

Cholesteric liquid crystals (CLCs) are selectively reflective optical materials, the color of which can be tuned via electrical, thermal, mechanical, or stimuli. In this work, we show that self-regulation transmission a circularly polarized incident beam occur upon phototuning selective reflection peak photosensitive CLC mixture towards pump wavelength. The autonomous behavior occurs as red-shifting approaches wavelength laser light. Once red-edge bandgap and overlap, rate tuning...

As a method for reducing the friction of high-precision system, air bearings have been widely used various industrial applications. However, their small damping leads to poor in-position stability and therefore systems are susceptible residual vibration disturbance. In this study, linear motion stage which is guided by bearing noncontact eddy current module proposed. The consists Halbach array permanent magnets fixed conductor plate. An generated in direction opposing change magnetic field...

Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text Kenneth D. Singer, Tomasz Kazmierczak, Joseph Lott, Hyunmin Song, Yeheng Wu, James Andrews, Eric Baer, Anne Hiltner, and Christoph Weder, "Toward Roll-to-Roll Production of Polymer Microresonator Lasers," Optics & Photonics News 19(12), 28-28 (2008) Export BibTex Endnote (RIS) HTML Plain alert Save article

We measure and model the spectral dependence of Faraday rotation in one-dimensional lattice structures composed co-extruded alternating polymer layers polymethylmethacrylate polystyrene. develop a theory that shows net symmetric multilayer system is determined not by total thickness constituent materials but time spent each material as measured overall group velocity delay structure relative energy distribution per material. compare computed spectra for these films to theoretical...

Traditional engineering education at university level has many limitations which prompted the growth of newer approaches. On such an approach is CDIO stands for Conceive, Design, Implement and Operate. innovative initiative, offers alternative educational framework producing better-prepared highly skilled graduates. The students learn to solve problems complete projects following stages as To improve teaching learning students, initiative aims make four important improvements; increases...

We study the effects of temperature changes on operating wavelength all-polymer microresonator lasers, particularly multilayered defect distributed feedback and Bragg reflector lasers. The parameters that change are discussed with comparisons between experiments simulations.

We report on melt-processed all-polymer distributed feedback lasers. The slope efficiency and lasing threshold of these lasers are found highly pumping angle dependent, with a maximum nearly 4.6% lowest 0.9mJ/cm2.