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Coupling induced transparency and absorption in photon-magnon coupling
Biswanath Bhoi,Bosung Kim,Haechan Jeon,Sang-Koog Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
The prospect of a full control of electromagnetic waves has inspired intensive efforts on light-matter interactions in recent years. The two most interesting phenomena applicable to quantum information technology [1-3] are electromagnetically induced transparency (EIT) and absorption (EIA), arising from atomic coherences occurring in light-matter interaction. It is very difficult to construct a single system that exhibits both the phenomena simultaneously, due to the fact that conventional coupled systems often lack independent tenability and controllability of their eigenmodes. It is interesting to find a plausible method that would permit a single device where energy conversion or information transfer can be maximized through coupling-induced transparency (CIT) or absorption (CIA) [4-5]. In this regard, we fabricated a hybrid system composed of magnons (collective spin excitations) and microwave photons (electromagnetic excitations) in order to make them strongly couple with merits of flexibly tailored dispersion and damping rate [6-9]. Here we report on an experimental observation of the simultaneous occurrence of CIT and CIA in photon-magnon coupling (PMC) in a planar hybrid system that consists of a yttrium iron garnet (YIG) film and a multi-concentric inverted-split-ring resonator (ISRR). The observed CIT/CIA dispersions are ascribed to the multi-channel decay process through magnon-mediated interactions between the individual modes of concentric ISRR photon resonators. Furthermore, we achieved a substantial manipulation not only of CIT/CIA and coupling strength but also a reliable transition between different types of interactions by positioning differently the YIG film as well as varying the direction of bias dc magnetic fields. An analytical model adopting competition between the coherent and dissipative interactions is established to capture physical insights of magnon-mediated photon-photon interactions, which model precisely reproduces the experimental findings. This work provides promising guidance for designing effective, flexible, and controllable photon-magnonics devices that are highly demanded in the development of quantum technologies.
Coexistence of coupling-induced transparency and absorption in photon-magnon coupling
Biswanath Bhoi,Bosung Kim,Hae-Chan Jeon,Sang-Koog Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
The prospect of a full control of electromagnetic waves has inspired intensive efforts on light-matter interactions in recent years. The two most interesting phenomena applicable to quantum information technology are electromagnetically induced transparency (EIT) and absorption (EIA), arising from atomic coherences occurring in light–matter interaction. it is very difficult to construct a single system that exhibits both the phenomena simultaneously, due to the fact that conventional coupled systems often lack independent tenability and controllability of their eigenmodes. It is interesting to find a plausible method that would permit a single device where energy conversion or information transfer can be maximized through coupling induced transparency (CIT) or absorption (CIA). In this regard, we fabricated a hybrid system composed of magnons (collective spin excitations) and microwave photons (electromagnetic excitations) in order to make them strongly couple with flexibly tailored dispersion and damping rate. Here we report on an experimental demonstration of the simultaneous occurrence of CIT and CIA phenomena in photon-magnon coupling (PMC) in a planar hybrid system that consists of a yttrium iron garnet (YIG) film and a multi-concentric inverted-split-ring resonator (ISRR). The coexistence of both CIT and CIA behaviors is ascribed to magnon-mediated interactions between individual decoupled (or very weekly coupled) ISRRs. In order to capture the generic physics of the magnon-mediated photon-photon interactions, we made an analytical model based on competition between the coherent and dissipative photon-magnon interactions, which model precisely reproduces the experimental findings. The coupling parameters associated with the CIT/CIA behaviors are tunable by changing the direction of applied static magnetic fields and the position of YIG film on the microstripline. The demonstration of multifunctional characteristics of PMC in a single planar device provides a crucial stepping stone for the development of more complex, controllable, and sensitive photon-magnonics devices that are highly demanded in the development of quantum technologies.