Beomjoon Kim

Measurement of the quantum-mechanical phase in quantum matter provides the most direct manifestation of the underlying abstract physics. We used resonant x-ray scattering to probe the relative phases of constituent atomic orbitals in an electronic wave function, which uncovers the unconventional Mott insulating state induced by relativistic spin-orbit coupling in the layered 5d transition metal oxide Sr2IrO4. A selection rule based on intra-atomic interference effects establishes a complex spin-

This paper describes the transfer of thin gold films deposited on rigid silicon substrates to polydimethylsiloxane (PDMS) with reliable and strong bonding. Modification of the Au surfaces with (3-mercaptopropyl)trimethoxysilane (MPTMS) as a molecular adhesive was carried out to promote adhesion between Au and PDMS. The degree of bonding with respect to the concentration of MPTMS, treatment time and methods of deposition was investigated by a simple adhesion test using two different adhesive tape

Abstract Porous microneedles are expected to have a variety of potential for applications in diagnostics owing to their ability to penetrate human skin painlessly and extract bio‐fluid by capillary action. In this paper, a ‘Porous Microneedle on a Paper substrate’ (PMP) is proposed as a novel platform for direct integration of sensors. A microneedle array with height of approximately 840 μm was prepared on a paper. The fabrication process consists of salt leaching and heat press moulding. In thi

In this paper, we present technologies for measuring inner dimensions of small holes. In the first method with a single probe system, the electrical contact between a vibrating probe and the inner surface of a hole is detected and the duty factor of the contact is measured. Through controlled scanning by a probe with a constant duty factor, data on the ups and downs of the surface profile are obtained. To characterize inside profiles of micro-holes regardless of materials, we developed a new tec

Microneedles are designed for piercing the stratum corneum and delivering drugs into the epidermis and dermis layers of the skin. Their micrometric dimension causes minor or negligible stimulations to sensory nerve fibers in the dermis layer of the skin, making drug administration through microneedles less painful compared to conventional hypodermic needle injection. With the advancement of microneedle related research, an increasing number of drugs are using microneedle-mediated drug delivery i

The inexpensive fabrication of high-quality probes for near-field optical applications is still unsolved although several methods for integrated fabrication have been proposed in the past. A further drawback is the intensity loss of the transmitted light in the 'cut-off' region near the aperture in tapered optical fibres typically used as near-field probes. As a remedy for these limitations we suggest here a new wafer-scale semibatch microfabrication process for transparent photoplastic probes.