United States

In this work, we study the photo-response properties (e.g., photoresponsivity and noise equivalent power (NEP)) of in-plane MoS2 photodetectors as the function of their geometric dimensions (e.g., thickness, length, and width of photoactive layers) and fabrication conditions (e.g., doping, etching, and substrate choice).

EIPBN 2021

Fabrication optimization of the photo-response characteristics of MoS2 photodetectors for biosensing applications

biosensor

optoelectronics

2d material

optimization

The Electronic Materials Conference (EMC) is the premier annual forum on the preparation, characterization and use of electronic materials. This year’s event will feature a plenary session, topical sessions, a poster session and more.

EMC is coordinated with the Device Research Conference (DRC), which will be held during the same week, from June 20-23. This recognizes the strong interaction between device and electronic materials research and provides fruitful exchange of information between attendees of both Conferences.

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EMC 2021

technical paper

The International Conference on Electron, Ion and Photon Beam Technology and Nanofabrication (EIPBN), affectionately known as "3-Beams," is the premier gathering of scientists and engineers who are dedicated to electron, ion and photon lithography, imaging, and analysis; atomically precise fabrication; nanofabrication process technologies and related emerging technologies; and their applications in a broad spectrum of fields. In its 64th meeting, researchers from academia, government laboratories, and industry from around the world meet to present and discuss recent and future trends in these technologies.
 
 
 
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High aspect ratio nanostructuring requires high precision pattern transfer with highly directional etching. In this work, we demonstrate the fabrication of structures with unprecedented ultra-high aspect ratios up to 10’000:1 in the nanoscale regime (down to 10 nm) by metal assisted chemical etching (MacEtch) of silicon in gas phase.

Nanofabrication by Metal Assisted Chemical Etching of Silicon in Gas Phase

In this paper we report a series of breakthroughs that led to replication of gratings with a slant angle up to 60° and an aspect ratio of 10:1 in a material with refractive index of 1.90 (RI). A study of the replication process and materials optimization will be presented.

Nanoimprint process to mass manufacture highly-angled high-RI gratings for augmented reality combiners

Sequential vapor infiltration (SVI) with trimethylaluminum into UV-cured films visualized the presence of internal layered structures with different Al distributions dependent on chemical structure of monomers. X-ray reflectivity measurements revealed that the mixing of monomers was a positive way to homogenize the Al distributions in UV-cured films.

Internal Layered Structures of UV-Cured Thin Films after Sequential Vapor Infiltration Analyzed by X-ray Reflectivity Measurements

Until now, no in-situ, non-destructive and accurate technology has been invented, which introduces huge difficulties into the superhydrophobic surfaces research and applications. We developed an optical technology to characterize the state of superhydrophobic surface.

Optical Metrology of Characterizing Superhydrophobic States on Patterned Substrates

In direct writing laser lithography, hybrid structures such as gratings on top of resist structures can be generated by combining thermal NIL with DWL lithography. At 120 °C, it is still possible to pattern the resist into at least 4 µm depth without degrading the photosensitive component.

Hybrid structures achieved by direct writing laser lithography - tuning the contrast and surface topography of grayscale photoresist with nanoimprint lithography

Colors produced from nanostructures of different geometries and materials in 2D and 3D made mostly using 3D printing with two-photon polymerization.

Nanostructured Colors from Colorless Materials

We investigated the combination of maskless UV lithography and 2PP (two-photon polymerization) on a standard photo-resist: SU-8. 2PP technology is known to be slow. The advantage of mixing the technologies becomes obvious when some elements of a design can be exposed faster using maskless UV lithography.

Hybrid 2D & 3D Lithography

In this work, we discuss the fabrication process for two types of low-index metalenses composed of air-spaced elements.  First, we discuss the fabrication of our recently demonstrated two element hybrid achromatic metalens (HAML)  that employs nanopillars. Second, we discuss a novel air-spaced, varifocal, metalens that employs nanoholes.

Achromatic and Varifocal Metalens Doublet Fabrication by Two-photon Lithography

We present 3D printed Hybrid metasurfaces that employ variable height (3D) phase plates, pillars, and holes that provide additional degrees of freedom beyond purely planar designs. These structures were 3D printed with two-photon lithography technique.

Hybrid Metasurface Fabrication Using Two-photon Lithography

Molybdenum disulfide, as  a transition metal dichalcogenide, has attracted huge attention for its good optical properties. However, to produce corresponding arrays of nano/microscale devices, resist-based lithography and etching generate permanent contaminations and damages. Here, we report a  method capable of generating arbitrary MoS2 patterns without additional lithography or etching processes.

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