def calc_field(phi_k, kx_v, ky_v, kz_v):
    """ 
    Calculates the Electric field in Fourier space.

    Parameters
    ----------
    phi_k : numpy.ndarray
        3D array of the Potential.

    kx_v : numpy.ndarray
        3D array containing the values of kx.

    ky_v : numpy.ndarray
        3D array containing the values of ky.

    kz_v : numpy.ndarray
        3D array containing the values of kz.
    
    Returns
    -------
    E_kx : numpy.ndarray
       Electric Field along kx-axis.

    E_ky : numpy.ndarray
       Electric Field along ky-axis.

    E_kz : numpy.ndarray
       Electric Field along kz-axis.
    
    """

    E_kx = -1j * kx_v * phi_k
    E_ky = -1j * ky_v * phi_k
    E_kz = -1j * kz_v * phi_k

    return E_kx, E_ky, E_kz