Pai-Yen Chen

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Intersubband transitions in n-doped multi-quantum-well semiconductor heterostructures make it possible to engineer one of the largest known nonlinear optical responses in condensed matter systems--but this nonlinear response is limited to light with electric field polarized normal to the semiconductor layers. In a different context, plasmonic metasurfaces(More)
  • Christos Argyropoulos, Pai-Yen Chen, Nader Engheta, Andrea Alù, Giuseppe D Aguanno, Giuseppe D 'aguanno +1 other
  • 2016
(2012). Boosting optical nonlinearities in ε-near-zero plasmonic channels. Abstract The anomalous transmission properties of zero-permittivity ultranarrow channels are used to boost Kerr nonlinearities and achieve switching and bistable response for moderate optical intensities. Strong field enhancement, uniform all along the channel, is a typical feature(More)
We propose and analyze a graphene-based cloaking metasurface aimed at achieving widely tunable scattering cancelation in the terahertz (THz) spectrum. This 'one-atom-thick' mantle cloak is realized by means of a patterned metasurface comprised of a periodic array of graphene patches, whose surface impedance can be modeled with a simple yet accurate(More)
spatial profi le. Gradient metasurfaces provide a much richer control of the wave-front in both local amplitude and phase of the emerging transmitted and refl ected beams. [ 4–7 ] Such structures enable fl at optical components for beam focusing, polarization control and phase correction, to name a few examples. [ 4–9 ] The next challenge and exciting(More)
Following our recently introduced analytical tools to model and design conformal mantle cloaks based on metasurfaces [Padooru et al., (2012)], we investigate their performance and physical properties when excited by an electric line source placed in their close proximity. We consider metasurfaces formed by 2-D arrays of slotted (meshes and Jerusalem cross(More)
Miniaturized helix antennas are integrated with drug reservoirs to function as RFID wireless tag sensors for real-time drug dosage monitoring. The general design procedure of this type of biomedical antenna sensors is proposed based on electromagnetic theory and finite element simulation. A cost effective fabrication process is utilized to encapsulate the(More)
Autonomous liquid-volume monitoring is crucial in ubiquitous healthcare. However, conventional approach is based on either human visual observation or expensive detectors, which are costly for future pervasive monitoring. Here we introduce a novel approach based on passive harmonic transponder antenna sensor and frequency hopping spread spectrum (FHSS)(More)