光诱导磁子态调控的宽频带非互易传输  

Broadband nonreciprocal transmission tuned by pump-induced magnon modes

作　　者：陈志坚 赵恺欣 王辰笑 魏纯可 姚碧霂[2] CHEN Zhijian;ZHAO Kaixin;WANG Chenxiao;WEI Chunke;YAO Bimu(School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;State Key Laboratory of Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China)

机构地区：[1]上海科技大学物质科学与技术学院,上海201210 [2]中国科学院上海技术物理研究所,红外科学与技术重点实验室,上海200083

出　　处：《物理学报》2025年第8期229-235,共7页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2022YFA1404603);国家自然科学基金(批准号:12122413)资助的课题.

摘　　要：本研究提出了一种通过引入多个调制泵浦信号来灵活调控微波非互易隔离带的方法,从而将常规的单模式的磁子非互易传输拓展到了宽频调节的范畴.具体地,本研究通过在腔磁子系统中激发多个光诱导磁子态,并使其与连续域束缚态发生强耦合,形成多个杂化模式,实现了对非互易通道数量和隔离区域的精确控制.该方法无需依赖静磁场调节,能够实现独立的多通道非互易隔离带,以及泵浦可调的带通和带阻隔离,而不依赖于对系统的重构.这显著提升了非互易频带的调节能力和系统的灵活性,为开发多通道、可调谐的非互易器件在信息处理中的应用奠定了技术基础.Nonreciprocal electromagnetic wave transmission is essential for wireless communication,quantum computing,and radar systems,traditionally relying on breaking time-reversal symmetry through static magnetic fields or structural modifications,which face limitations in tunability and integration.Recent advancements in cavity magnonics,particularly the use of bound states in the continuum(BIC)and pump-induced magnon mode(PIM),have enhanced the nonreciprocal isolation and dynamic control of magnon dynamics.In this study,a novel method to achieve broadband-tunable microwave nonreciprocal isolation is presented by introducing multiple modulated pump signals,thereby extending traditional single-mode magnon-based nonreciprocal transmission to multi-channel and broadband regimes.The core method involves exciting multiple PIMs in a cavity magnonics system and strongly coupling them with BIC to generate hybrid modes with pronounced nonreciprocal characteristics.The experimental setup is comprised of a 1-millimeter-diameter yttrium iron garnet(YIG)sphere positioned at the node of a microwave resonator(central frequency:2.92 GHz),with pump signals injected through a microwave patch antenna.By dynamically tuning the frequency,power,and number of pump signals,the precise control over the number of nonreciprocal isolation channels and their spectral positions is realized.Notably,the continuous tuning of the nonreciprocal bandwidth is achieved by increasing the number of pump signals from 2 to 5,expanding the isolation bandwidth from 6 MHz to 14 MHz.Furthermore,by tailoring the spectral distribution of pump signals,the system realizes flexible switching between bandpass and band-stop isolation states.Importantly,this method eliminates the need of static magnetic field adjustments or structural reconfiguration,relying solely on coherent microwave-photon interactions to modulate PIM-BIC coupling.Experimental results highlight two key physical outcomes:1)Extending conventional single-mode magnonic nonreciprocal transmission to multi-c

关 键 词：非互易性 磁子 光诱导磁子 连续域束缚态 

分 类 号：O441.1[理学—电磁学]