audio_part1

May 18, 2026 07:21 · 6:54 · English · Whisper Turbo · 1 Ομιλητές

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Ευρετήριο Διαλέξεων

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Hi, my name is Partha Mondol.

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I am working as a postdoc researcher at King Abdullah University

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of Science and Technology.

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I am working under Professor Hakan Bakhi.

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I am going to present our work titled as

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Polarization Independent Dual -Band Quasi -Basey in All

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Dielective Metasurfaces.

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Here is the outline of my talk.

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At first,

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I will give very brief introduction of Bernstein continuum and

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quasi -BIC.

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Then I will highlight the advantages of dielectric metasurface

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over plasmonic metasurface.

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Then I will mainly focus on symmetry -protected BIC,

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which we have employed in our structure,

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then motivation,

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design methodology,

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reformatric simulation and result,

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multipolar analysis,

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and then conclusion.

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BIC are the localized state that exists in

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the

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continuum of radiation spectrum.

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It characterized by very high

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Q factor and very low dissipative loss.

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and it was first theorized by Newman and

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Wagner in 1929 in the field of quantum mechanical

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systems.

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Then the idea was extended to the photonic system

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and it founds in waveguide,

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photonic crystal,

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metal surface optical waveguide and it finds due to

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its high Q factor and very extreme light confinement,

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it has been utilized into many applications.

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So there are different types of BIC based on their

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formation.

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So mainly it is divided by

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accidental BIC which occurs due to

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the cancellation of radiation,

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due to the specific structural

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parameter,

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due to the continuous tuning of structural

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parameter.

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And it can be divided into it.

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The Frederick Winton BIC or every pair of BIC comes

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under this accidental BIC.

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Another very popular kind of BIC is symmetry protected BIC

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where the mode,

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the radiation cancels out due to the symmetry mismatch between

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the mode and the radiation.

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So, for perfect VSE,

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Q -factor is infinite,

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but for quasi -VSE,

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which is not possible because

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it has zero line width,

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so it is not possible to access externally.

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So,

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quasi -VSE,

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which actually...

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mix for practical application which is characterized by

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high Q factor and VAC

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is applied in biosensing in nonlinear optics and harmonic generation

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and laser laser filtering and entangled

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photon generation so plasmonic

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matter surface which

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support very strong resonant response and strong

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air philic confinement but it due to it has very high absorption

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loss and weak magnetic response so that's

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why it limited q factor the other hand dialectic

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structure which

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like silicon titanium oxide gallium

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nitride etc so which support both electric

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and magnetic resonance by me resonance and a

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very low dissipative loss and it

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is used for metal lens beam steering many practical applications

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and it is comfortable with also cmos portland platform

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So symmetry protected BIC which comes

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due to the symmetry mismatch and the symmetry

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mismatch can be done by reducing the volume like

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or by changing the orientation like if

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we see this silicon

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structure so by reducing the

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If we make the system pattern,

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so if we reduce certain length,

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so there is Q factor QBIC

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can generate and it gives rise to second harmonic generation.

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or we can tune the angle or we can make

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the system the whole like asymmetry right

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or without any breaking we can without

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breaking the structure we can just make the translational

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symmetry like the species between these and

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make the while the

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mirror symmetry is

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keep the mirror symmetry,

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but breaking the transillational symmetry.

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So we see two symmetry breaking mirror symmetry,

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we see four symmetry.

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But there are

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main two challenges.

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So one is that on the most of the

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BIC, that is this challenge,

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it becomes most of the BIC,

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that is symmetry protected BIC,

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that they are

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dependent on the polarization of the system which

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makes the limitation for practical

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application and another key challenge is to

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make the resonant

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wavelength fixed against the robust

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perturbation

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so these two challenge and also very simple

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design structure and high Q factor so in

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that work we have proposed we propose amorphous silicon based

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dielectric structure which support polarize an independent stable resonance

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for CBSA which is applicable for

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advanced volcanic application

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