14 citations · 14 across the 18 of their papers we have counts for
18 papers
Which pulse maximizes resonant nonlinear conversion?
Alex Krasnok
At fixed pulse energy, which drive waveform extracts the most th-order nonlinear conversion from a resonator ( for second harmonic)? A short pulse couples poorly to a narro…
Protecting Qubits from Purcell Decay via Permanent Dipoles
Alex Krasnok
Reading out a qubit often requires coupling it to a resonator, but that same resonator can also give the qubit an extra path to decay. Here, we study a way to reduce this loss usin…
From False Roots to Phasors: Negative and Complex Numbers in Mathematics, Physics, and Electrical Engineering
Alex Krasnok
Negative and complex numbers are so familiar in modern mathematics, physics, and engineering that it is easy to forget how uncertain their status once was. They did not become esta…
Trajectory probing of complex-frequency scattering with chirped analytic pulses
Alex Krasnok, Denis Seletskiy
Characterizing resonant scatterers is challenging because their poles and zeros usually lie away from the real-frequency axis, whereas most measurements sample only real frequencie…
Advanced Superdirective Antennas
Alex Krasnok
Superdirective (supergain) antennas aim to produce a narrow main beam from radiators that are electrically small compared with the wavelength. Instead of enlarging the physical ape…
Purcell-Like Environmental Enhancement of Classical Antennas: Self and Transfer Effects
Alex Krasnok
Environmental 'range boosts' in wireless links are often explained through radiation-pattern intuition, yet the underlying physics is more cleanly captured by two environment-contr…
Constant-Amplitude Phase Modulation from Topological Pole--Zero Winding
Alex Krasnok
Resonant phase shifters inevitably mix phase and amplitude. We present a topological synthesis that guarantees a full phase swing at a prescribed constant scattering magnitude…
Twist-Tuned Strong Coupling in Sub-GHz Wire Metasurface Bilayers
Ingrid Torres, Alex Krasnok
Twist-angle control offers a bias-free route to reconfigurable metasurfaces, yet its extension to deeply subwavelength resonant platforms at VHF/UHF remains limited. We demonstrate…
Coherently Assisted Wireless Power Transfer Through Poorly Transparent Barriers
Alex Krasnok
Poorly transparent barriers (e.g., reinforced walls, shielding panels, metallic or high-contrast dielectrics) strongly reflect incident radiation, limiting wireless power transfer…
A Cryogenic Dielectric Antenna for Wireless Sensing and Interfacing Outside the 10 K Environment
Ingrid Torres, Alex Krasnok
The performance and scalability of cryogenic microwave systems, particularly for quantum processors, are fundamentally limited by the thermal stability and loss of their constituen…
Selective Addressing of Coupled Qubits via Complex Frequency Zero Targeting
Deepanshu Trivedi, Laraib Niaz, Alex Krasnok
Achieving precise, individual control over qubits within scalable quantum processors is critically hampered by parasitic couplings and spectral crowding, leading to detrimental cro…
Selective Excitation of Coupled Resonators via Complex Frequency Driving: Enhanced Efficiency and Crosstalk Suppression
Deepanshu Trivedi, Laraib Niaz, Andrea Alù +1
Controlling individual elements of coupled resonator systems poses a significant challenge, as conventional real-frequency pulses suffer from inefficiency and crosstalk, limiting f…
Topological Phase Control via Dynamic Complex Pole-Zero Engineering
Alex Krasnok
Precise optical phase control is crucial for innovations in telecommunications, optical computing, quantum information processing, and advanced sensing. However, conventional phase…
Backscattering-Immune Floquet Conversion in Ring Modulators
Awanish Pandey, Alex Krasnok
Backscattering in micro-ring cavities induces mode mixing and limits device performance. Existing methods to mitigate backscattering often involve complex fabrication processes or…
Gain-Loss Coupled Systems
Chunlei Zhang, Mun Kim, Yi-Hui Zhang +7
Achieving oscillations with small dimensions, high power, high coherence, and low phase noise has been a long-standing goal in wave physics, driving innovations across classical el…
Revealing Invisible Scattering Poles via Complex Frequency Excitations
Deepanshu Trivedi, Arjuna Madanayake, Alex Krasnok
Recent research in light scattering has prompted a re-evaluation of complex quantities, particularly in the context of complex frequency signals, which exhibit exponential growth o…
Anomalies in Light Scattering: A Circuit Model Approach
Deepanshu Trivedi, Arjuna Madanayake, Alex Krasnok
In experimental physics, it is essential to understand electromagnetic (EM) wave scattering across EM spectrum, from radio waves to X-rays, and is pivotal in driving photonics inno…
Twist-Controlled Wire Metasurfaces
Ingrid Torres, Alex Krasnok
Twistronics, originally conceptualized within the electronics domain to modulate electronic properties through the twist angle between stacked two-dimensional (2D) materials, prese…