Excel Export button routes not working

I have an Export button in the index page when the user clicks the Export button I want the data to be exported to an Excel sheet. In this case, do I need to add routes? because I am not redirecting it to any pages. I just want data to be exported to an Excel sheet. I am new to this environment and I am trying to understand routes as well.

I have been trying to

In routes.php

Route::group(array('prefix' => 'admin', 'before' => 'auth.admin'), function()
{   
    Route::resource('halls', 'HallsAdminController');

        Route::get('halls/export', 'HallsAdminController@export');

    Route::post('halls/{id}', 'HallsAdminController@store');
    Route::get('halls/{id}/create/{step}', 'HallsAdminController@create');
    Route::get('halls/{id}/edit/{step}', 'HallsAdminController@edit');
    Route::get('halls/{id}/images/{image_id}/delete', 'HallsAdminController@destroy_image');
    
});

In Index.php

 <div class="controls">
            <a href="{{ url('admin/halls/export') }}" class="new">Export</a>
 </div>


In HallsAdminController.php

public function export(){
    
        dd("Export Clicked");
    }

but it is not hitting export function, what am I doing wrong. Please help me.