Abstract The coloration of some butterflies, Pachyrhynchus weevils, and many chameleons are notable examples natural organisms employing photonic crystals to produce colorful patterns. Despite advances in nanotechnology, we still lack the ability print arbitrary colors shapes all three dimensions at this microscopic length scale. Here, introduce a heat-shrinking method 3D-printed with 5x reduction lattice constants, achieving sub-100-nm features full range colors. With these structures as 3D...

Additive manufacturing at small scales enables advances in micro- and nanoelectromechanical systems, micro-optics, medical devices. Materials that lend themselves to AM the nanoscale, especially for optical applications, are limited. State-of-the-art processes high-refractive-index materials typically suffer from high porosity poor repeatability require complex experimental procedures. We developed an process fabricate 3D architectures out of fully dense titanium dioxide (TiO2) with a...

Confining photons in cavities enhances the interaction between light and matter. In cavity optomechanics, this enables a wealth of phenomena ranging from optomechanically induced transparency to macroscopic objects cooled their motional ground state. Previous work optomechanics employed devices where ubiquitous structural disorder played no role beyond perturbing resonance frequencies quality factors. More generally, interplay disorder, which must be described by statistical physics,...

Nanophononics has the potential for information transfer, in an analogous manner to its photonic and electronic counterparts. The adoption of phononic systems been limited, due difficulties associated with generation, manipulation, detection phonons, especially at GHz frequencies. Existing techniques often require piezoelectric materials external radiofrequency excitation that are not readily integrated into existing CMOS infrastructures, while nonpiezoelectric demonstrations have...

Effective thermal management of electronic devices encounters substantial challenges owing to the notable power densities involved. Here, we propose layered MoS 2 phononic crystals (PnCs) that can effectively reduce conductivity (κ) with relatively small disruption electrical (σ), offering a potential solution for nanoelectronics. These PnCs exhibit remarkable efficiency in reducing κ, surpassing Si and SiC similar periodicity by ~100-fold. Specifically, suspended PnCs, measure an...

We report the optical properties obtained through experiments, simulation, and theory of ultrathin (<0.1λ), amorphous Si nanopillar arrays embedded in a thin film SiO2 designed for narrowband filtering multi- hyperspectral imaging near-infrared. The fabricated are square-packed with subwavelength periodicity, heights ∼100 nm, radius-to-spacing ratio, r/a, ∼0.2. Specular reflection measurements at normal incidence demonstrate that these behave as narrow stopband filters near-infrared (λ =...

Phonons offer the possibility to connect microwave and optical domains while being efficiently transduced with electronic signals. Here, we present a multimodal optomechanical platform, consisting of mechanical-optical-mechanical resonator configuration. The mechanical modes, frequencies at 265 MHz 6.8 GHz, can be simultaneously excited into phonon lasing regime as supported by stability analysis system. Both megahertz gigahertz modes enter self-sustained oscillation regime, leading...

The substitution of extra virgin olive oil with other edible oils is the primary method for fraud in olive-oil industry. Developing inexpensive analytical methods confirming quality and authenticity a major strategy towards combatting food fraud. Current used to detect such adulterations require complicated time- resource-intensive preparation steps. In this work, comparative study incorporating Raman infrared spectroscopies, photoluminescence, thermal-conductivity measurements different...

Classical thermal rectification arises from the contact between two dissimilar bulk materials, each with a conductivity (k) different temperature dependence. Here, we study in Si(1−x)Gex alloy spatial dependence on atomic composition. Rectification factors (R = kmax/kmin) of up to 3.41 were found. We also demonstrate suitability such an for logic gates using AND gate as example by controlling profile via This system is readily extendable other alloys, since it only depends effective...

Sub-wavelength periodic arrays exhibit narrow near-unity reflection bands that arise from guided mode resonances. These resonances have extremely high quality factor (i.e., band features) and are ideal for filtering applications. A requires many periods, causing large lateral footprints limit an imaging system's spatial resolution. We present a 1D ultra-thin (&amp;lt;100 nm) compact finite design of seven periods amorphous Si slabs with subwavelength periodicity surrounded by Al mirrors,...

An understanding of heat transport is relevant to developing efficient strategies for thermal management in areas study such as microelectronics, well fundamental science purposes. However, the measurement temperatures nanostructured environments and cryogenic conditions remains a challenging task, requiring both high sensitivity noninvasive approaches. Here, we present portable nanothermometer based on molecular two-level quantum system that operates (3–20)-K temperature range, with spatial...

Engineering of the dispersion properties a photonic crystal (PhC) opens new paradigm for design and function PhC devices. Exploiting PhCs allows control over wave propagation within PhC. We describe design, fabrication, experimental observation bands 3D capable negative refraction in mid-infrared. Band structure equifrequency contours were calculated to inform polymer-germanium core-shell PhCs, which fabricated using two-photon lithography direct laser writing sputtering. successfully...

The thermal imaging of surfaces with microscale spatial resolution over micro-sized areas remains a challenging and time-consuming task. Surface is very important characterization tool in mechanical engineering, microelectronics, chemical process optics, microfluidics, biochemistry processing, among others. Within the realm electronic circuits, this technique has significant potential for investigating hot spots, power densities, monitoring heat distributions complementary...

We use a plane wave expansion method to define parameters for the fabrication of 3-dimensional (3D) core-shell photonic crystals (PhCs) with lattice geometries that are capable all-angle negative refraction (AANR) in midinfrared centered around 8.0 μm. discuss dependence AANR frequency range on volume fraction solid within and ratio low index core material high shell material. Following constraints set by simulations, we fabricate two types nanolattice PhCs: (1) polymer core-germanium (2)...

Three-dimensional (3D) photonic crystals have potential in solid state lighting applications due to their advantages over conventional planar thin film devices. Periodicity a crystal structure enables engineering of the density states improve spontaneous light emission according Fermi's golden rule. Unlike films, which suffer significantly from total internal reflection, 3D architectured is distributed space with many non-flat interfaces, facilitates substantial enhancement extraction. We...

Sub-wavelength arrays have garnered significant interest for many potential optoelectronics applications. We fabricated sub-wavelength silicon nanopillar with a ratio of radius, r and center-to-center distance, a, r/a &asymp; 0.2 that were fully embedded in SiO₂ narrow stopband filters are compact straightforward to fabricate compared conventional Bragg stack reflectors. These well-suited hyperspectral filtering applications the infrared. They ultra-thin (&lt;0.1&lambda;),...

In modern electrical circuits overheating is an issue and techniques enabling efficient heat dissipation are critical. One potential solution to dissipate excess away from critical electronic components 2D materials, due their high thermal anisotropy possibility of directing the flow. Here, we propose routing structures based on few-layer, nanopatterned MoS2 confine guide flow in a pre-specified in-plane direction. such can be evacuated hotspots through predefined path without affecting...

This experimental study investigates thermal rectification via asymmetric far-field radiation on a fused silica slab. An asymmetrical distribution of surface emissivity is created over the device by partially covering with 100 nm thick aluminum film. The slab subjected to bias, and when this bias reversed, small temperature difference observed between different configurations. arises from in layer silica, resulting transfer energy surrounding environment through radiation. Experimental...

Interest in negative refraction has been motivated by the possibility of creating a "superlens" as proposed Pendry (Phys. Rev. Lett. 85, 3966 (2000)). This theoretical work showed that material capable amplifies evanescent waves and allows this to act lens with resolution not limited working wavelength. Although theory some experiments have shown certain metamaterials photonic crystals (PhCs) can superlenses, realistic demonstration optical infrared range remains challenge. is because most...

Nano-architected materials have the potential to be adopted in several areas including photonic devices and structural materials. We present a 3D interference lithography technique with dielectric metasurfaces at visible wavelengths that allows patterning of thick epoxide films over on order 10 cm^2 100 nm resolution. By leveraging ability metasurface control amplitude phase wavefront, complex near-field patterns can designed. Pyrolysis patterned SU-8 produces carbon-based material sub-100...

Phonons play a key role in the physical properties of materials, and have long been topic study physics. While effects phonons had historically considered to be hindrance, modern research has shown that can exploited due their ability couple other excitations consequently affect thermal, dielectric, electronic solid state systems, greatly motivating engineering phononic structures. Advances nanofabrication allowed for structuring phonon confinement even down nanoscale, drastically changing...